ThermoFoam Guide | Surveying Spray Foam Insulation

Our handy guide helps to advises about surveying spray foam insulation. When visiting a property to conduct a survey or initiating a sales process, it is essential to conduct a detailed assessment of the property and collate pertinent information to support the proposed insulation treatment. As a long-term insulation solution designed to last the life of the building/substrate, it is vital to ensure that spray foam is fitted in the correct environment. A survey is more complex than just measuring the roof area and submitting a price to the customer; it requires knowledge, experience and diligence. We’ve designed an app-based survey report that captures the critical information to support a spray foam insulation installation, and some of the key considerations include:

Customer Requirements

  • What does the customer hope to achieve from the installation?
  • Lower energy bills?
  • Better heat retention?
  • Draught elimination?
  • A longer-term insulation solution?
  • Anti-Condensation?
  • To free Up Attic Storage Space?
  • To remove loft insulation to eradicate pests and rodents?
  • Part of a green or carbon emissions reduction strategy?

Existing Insulation Levels

  • What is the current existing insulation strategy in the attic?
  • Is there mineral wool on the attic floor
  • Is it in good condition, laid consistently throughout the attic floor
  • What thickness is any current insulation
  • Is it proposed to remove existing insulation
  • If removed, will the spray foam system achieve the same or better thermal performance as the existing element?
  • Does the building have cavity wall insulation or underfloor insulation
  • If so, what type and thickness is the insulation

Current Ventilation Provision

  • Does the building have any natural or mechanical ventilation?
  • Do bathrooms and utility rooms have extract ventilation?
  • Does the kitchen have a cooker hood extraction?
  • Is the mechanical extraction sized accordingly to the property?
  • Is the mechanical extraction operational and working?
  • Do windows have trickle vents?
  • Are soffit vents present?
  • Is the roof ridge ventilated?
  • Are there any other forms of ventilation?
  • What are the daily habits of occupants?
  • Are windows and doors opened regularly?
  • How many occupants live in the property?
  • Are there likely to be any changes to occupancy levels?

General Roof Condition

  • What is the condition of the roof externally and internally
  • What is the roof type (hip, butterfly, dormer, open gable, flat, mansard)
  • Check the roof from the outside for slipped/broken tiles, failed chimney flashings
  • Use a camera pole for close-up inspection from the outside. Take photos/videos
  • Is there a roof membrane under the roof tiles (internally)
  • What type of roof membrane is present (bitumen felt, breathable membrane, timber sarking)
  • What is the condition of the roof membrane (record photos and videos)
  • What is the general condition of the roof rafters (dry, evidence of damp/mould/rot or woodworm)
  • What is the moisture content of roof rafters (use a damp meter to assess rafter faces and inside edges of rafters)

Attic Use & Obstacles

  • What is the attic currently used for, and are there plans to change its use?
  • Is the attic floor boarded
  • Are belongings stored in the attic
  • Are there any mechanical or electrical items located in the attic
  • Do any bathroom extraction ducts run through the attic, and are they vented externally
  • Is there a water storage tank in the attic, and does it have a sealed lid
  • Is there good access across the attic floor
  • Can all areas of the roof be reached internally
  • Are there plans to convert the attic into a room on the roof in the future
  • Is the attic a habitable or non-habitable space (check whether it’s used as a playroom/office, etc.)

Health and Safety Checks

  • Can the proposed insulation works be carried out safely?
  • Is parking on the customer’s driveway available, or are special permits required?
  • If parking on the street, can the hose be moved to the property without risk to the general public?
  • Are there any obstructions leading to the property (steps, ramp, lift etc?)
  • Can the attic be accessed through a hatch, and is there a usable ladder?)
  • Are there any belongings on the customer’s property that may present a trip or slip hazard?
  • Are there belongings in the attic that restrict safe access around the floor?
  • Is the attic floor structure stable?
  • Are there any elderly or vulnerable people within the property?

Once spray foam insulation is installed in the pitched roof area, it will limit the ability of building surveyors and other professionals to fully assess the roof’s condition should they need to for the purpose of a property sale, mortgage or equity release. The insulation design can follow BBA or KIWA certification while utilising best practices by collating, recording, and evidencing that you have completed a thorough and diligent survey. Many elements of a building may be affected by increased insulation levels, but if designed robustly and installed correctly, the resulting risk should have a low impact. The information below can be used for those within the spray foam industry or for those surveying spray foam insulation to arrive at a reasonable conclusion as to its suitability for the property.

Important Items to Consider

The various items to be checked when surveying spray foam insulation which may lead to remedial actions required before it should be installed. Our handy surveying spray foam insulation guide below details conditions under which spray foam can be installed with or without corrective actions and situations where spray foam insulation wouldn’t suit the building. REMEMBER – when surveying a building for its suitability for spray foam insulation, you must be diligent and professional and record the evidence that supports a low-risk installation. The spray foam industry has been negatively impacted by poor surveys, unethical sales practices and a lack of evidence showing the property’s condition before spray foam insulation was installed. By following this guide, assessing all necessary elements and recording detailed information, you correctly represent the spray foam industry and help build trust with mortgage lenders, surveyors and building owners.

Surveying Spray Foam Insulation | Roof Tile Condition

Broken roof tiles, slippages or cracks can act as an entry point for wind, rain, snow and frost to penetrate under roof battens. Even when the undertile roof is in good condition, the membrane will eventually degrade due to wind washing, excess moisture and potential damage from frost or snow. When the roof membrane becomes perished or brittle, it will not be effective as a barrier against external moisture, and this could lead to penetration into the insulation assembly, which may eventually lead to structural timber degradation. In the image below, there is evident damage to the roof where tiles have broken and slipped, creating large voids through which weather conditions can penetrate. A spray foam installation should only be recommended if the broken roof tiles are to be replaced and straightened to protect the internal membrane and attic space. Assessing the roof tile condition is an important part of surveying spray foam insulation.

The image here shows an external roof structure in excellent condition with no broken, slipped or cracked roof tiles. In this scenario, the roof tiles would act sufficiently as the primary without any gaps or penetrations where it could seep into the roof membrane. It is optional to climb up onto the roof during a survey provided it can be done safely, and most roof inspect

Surveying Spray Foam Insulation | Roof Valleys

Roof valleys represent areas where a roof connects to another angled roof elevation. This is particularly common where the building is L-shaped. Valleys are often protected by tiles or flashing, which acts as a waterproof barrier to stop moisture from leaking onto the roof membrane. It is essential to establish whether roof valleys are present and to assess whether any damage or obstacles may enhance the risk of a roof leak. Valleys can also be subject to moss growth and may also hold debris that restricts the easy flow of moisture down to the gutter. When water becomes trapped in valleys and sits on the surface for prolonged periods, it may eventually saturate tiles or flashing, damaging them and causing roof leaks. In the image below, the roof valleys contain a build-up of moss and debris, which may limit moisture flow down to the gutter. Before installing spray foam insulation, it would be prudent for the area of the roof to be assessed inside the attic to ensure there are no leaks. An advisory should be lodged with the building owner to recommend that valleys are periodically inspected and cleared.

The image here is an example of a roof valley junction that highlights no cause for concern. The valley is clear of debris, and there is no evidence that the metal flashing has broken, delaminated or risen from the substrate. Therefore, moisture can flow seamlessly towards the gutter and escape the roof in the intended way. Irrespective of the external assessment of roof valleys, it is still prudent to check the valley junction from inside the attic to ensure there is no evidence of roof leaks or damaged roof membranes. Assessing the condition of roof valleys is an important part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Ridge Tiles

Ridge tiles sit at the roof’s highest point, protecting the roof edges and where the two roof pitches meet. The condition of the ridge tiles requires careful assessment to ensure no dislodgement or damage may promote an entry point for moisture to penetrate the attic. Ridge tiles are usually bonded with mortar to provide a seal between tiles, and this should also be assessed to ensure that it hasn’t crumbled away. The image below shows extreme ridge tile damage with an increased risk of roof leaks. It is important to remember that leaks may not be visible from inside the attic due to the protective roof membrane; however, over time, moisture, wind and other weathering will likely perish the membrane, eventually leading to moisture ingress that will saturate the spray foam insulation. Always accompany an external visual check with an internal attic inspection to ensure that roof leaks are not present.

The image here shows an example of ridge tiles that appear in good condition with no dislodgement. The risk of roof leaks through failed ridge tiles is unlikely. If an internal attic inspection confirms no evidence of moisture, it would be suitable for installing spray foam insulation. Building owners should be informed of their responsibility to periodically check the condition of their roofs to ensure there aren’t changes that may lead to an increased risk level. Assessing the condition of ridge tiles is an important part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Chimney Flashing

Failed chimney flashing is a primary cause of leak development in attic spaces. The purpose of a chimney flashing is to provide a vertical seal from the base of the chimney, lapping onto the roof to ensure that moisture can find a route down the tiles to the gutter. Most chimney flashings use a thin lead sheet that can be bent into place to provide the intended protection; however, over time, the flashing will reach the end of life and can start to tear or peel away to enable a zone into which moisture can penetrate. The negative pressure of moisture from above will almost always become visible within the attic space around the chimney breast. In the image below, the chimney flashing has lifted at the edges and will likely continue to degrade from environmental conditions such as wind and rain. Signs of roof leaks must be checked from within the attic, particularly around the chimney breast. If the attic is free from leaks, the potential for failed or failing chimney flashing should be communicated to the building owner as a short-term remedial action, along with their responsibility to check the roof condition periodically.

The image here shows chimney flashing that is well sealed from the chimney onto the roof tile and has no signs of lifting or delamination. It is still essential to determine whether there is any evidence of roof leaks within the attic space. However, a visual inspection of the chimney flashing would determine it to have plenty of life span and a low risk of causing short to medium-term roof leaks. On this basis, a pitched roof spray foam installation would be a suitable treatment. Still, the building owner must understand the need to check the condition of the chimney flashing periodically. Assessing the condition of chimney flashing is an essential part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Roof Membrane

The roof membrane is one of the most critical items to assess as it is the primary waterproofing layer that prevents moisture leaks if and when roof tiles, ridges and valleys fail. The membrane represents a metaphoric insurance policy that should prevent external moisture from penetrating the attic. However, roof membranes have a finite lifespan, and their deterioration can be enhanced when subjected to wind washing, moisture, frost, snow and solar gain. Modern roof membranes are usually always breathable but are thinner and can be less durable than older-style non-breathable bitumen felts.

Most BBA or KIWA certificates will support applying the foam directly to a breathable membrane due to its low moisture resistance and interstitial condensation’s ability to migrate through the entire roof assembly. The image below shows a modern, breathable roof membrane in good condition for directly installing spray foam insulation. There are no tears or perforations, but due to the gauge of the membrane, it is essential to ensure that spray foam is applied carefully to avoid warping, damaging or tearing the membrane.

Older-style bitumen felt membranes are likely the most common type found under roof tiles in existing homes. When installed new, they are robust and offer strong protection against driving rain and moisture penetrating the attic. It is possible to spray foam directly to the membrane provided an intelligent membrane or vapour control layer is installed on the warm internal side of the insulation and is backed by a condensation risk analysis. Alternatively, a card rafter slide can be installed to create a 50mm ventilated cavity between the insulation and bitumen felt; however, ensuring the void is well-ventilated is essential. With any ageing membrane, it is necessary to assess whether it is in good condition, and the image below shows an example of a robust bitumen-felt membrane with no sign of damage or immediate deterioration. Assessing the type and condition of the roof membrane is an essential prt of the surveying spray foam insulation process.

Roof membranes may show signs of weakness occasionally, as evidenced in the image below. Small tears or perforations to the membrane can signal that it is reaching the end of life, and replacement may be required. Where small tears and perforations are sporadic, and the general condition of the membrane is acceptable, minor repairs can be made to strengthen the membrane and seal the holes. We recommend gently applying Flash Band strips to cover holes and using a light heat source to melt the strip onto the membrane. This will help to reinforce the membrane and seal the holes from the risk of moisture and wind washing. When left untreated or sprayed over, there is a risk of moisture penetrating and saturating the insulation assembly, which may lead to timber rot and roof degradation. With any membrane showing signs of degradation in the short term, we recommend postponing spray foam installation until the membrane is replaced from above the roof or using a card rafter slide to create a separating cavity. This should allow roof repairs to be conducted from above without damaging the insulation. The building owner must understand that the membrane is nearing the end of its life and that replacement should be imminent.

When roof tiles are visible, and there is no primary roof membrane or the membrane is in such a bad state of repair that it requires replacing, the default action should be the recommendation that the building owner replace the roof tiles and membrane. Installing spray foam insulation in these scenarios is not recommended, and a retrospective membrane or rafter slide will generally not provide sufficient protection from external moisture. Although it is common practice in the spray foam industry to fit a retrospective membrane of rafter slide as per the image below, an installation should only be carried out if the building owner is prepared to replace the roof covering within a few months. A retrospective membrane or rafter slide is attached to the inner rafter faces. Unlike traditional roof membranes, they do not seamlessly cover the top of the rafter to prevent moisture at the source. Should driving rain penetrate the tiles, it may simply leak down onto the rafter slide or membrane and eventually find its way down through the rafter edges and into the insulation assembly. Considering the card rafter slide is an important part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Moisture Content

It is essential to check the moisture content of structural roof rafters before installing spray foam insulation. The general threshold where an installation cannot be carried out is when the moisture content reaches 18% or above. It is not uncommon that moisture content is elevated during winter months. In these circumstances, a proposed installation should be left until warmer months when the timber can sufficiently dry and moisture levels return below the threshold. In addition, testing as many roof rafters as possible on both the rafter face and the sides is essential. There may be a variance in moisture content depending on the roof elevation. Therefore, it is necessary to check each elevation.

The example image here shows a standard moisture meter that detects the moisture content of various substrates. At well below 10% content, the risk of causing damage from spray foam insulation is very low, and the installation can proceed.

The images here show moisture content at the threshold where it is acceptable to install spray foam insulation. It is not uncommon for the moisture content to be at this level during winter; however, if the content is at this level during summer, the moisture risk is likely more significant during the winter, which would require further investigation before an installation should commence. It may be that roof leaks are present during wet winter spells. Therefore, further investigation is necessary. At the 18% threshold, an installation can continue, provided no areas of the roof structure contain a higher moisture content, so it is essential to assess every rafter fully. Waiting for the moisture content to fall below 18% may be prudent, depending on the time of year. For example, suppose moisture content is at 18% in September. In that case, the content will likely be higher by January, whereas, if the moisture assessment is at 18% in February, it is expected that the content will have reduced by April.

The moisture content in the images below has breached the 18% threshold. Therefore, ThermoFoam would not support spray foam insulation installation even though the threshold has been marginally breached. It is essential to respect the established thresholds and postpone an installation until the structural roof rafters have dried out to bring the moisture content below the threshold. Pay particular attention to the condition of the roof rafters to ensure there are no signs of rot or woodworm. Assessing moisture content in structural timbers is a vital part of the surveying spray foam insulation process.

There is a specific reason why spray foam insulation is no longer supported as a roof stabilisation solution directly to roof tiles. Generally, when a roof membrane is not installed under the roof tiles, there is a lack of primary protection for the structural timbers and attic space. Historically, closed-cell spray foam had been applied directly to roof tiles, encasing battens and rafters to provide additional lifespan and avoid roof replacement. Based on the moisture content in the image below, spray foam insulation would trap this moisture and elevate the speed at which the roof’s structural elements degrade. Applying Closed-cell foam directly to roof tiles is no longer certified or supported by the spray foam industry.

REMEMBER – the thresholds have been calculated based on scientific evidence to establish at which stage prolonged moisture can degrade and rot timber. There are no tolerances or variables once moisture content breaches the 18% threshold and no circumstances that support the installation of spray foam insulation (or any other insulation type) in these scenarios. As a professional spray foam surveyor, it is your responsibility to look for reasons why an installation is impossible, irrespective of the desire to agree on quotes and monetise the solution. When the parameters are ignored or breached, there is a heightened risk of damage to the building, which may further harm the integrity of the spray foam industry.

Surveying Spray Foam Insulation | Wood Rot

It is critical to assess the current condition of structural roof timber before a spray foam installation can commence. Even if the moisture content is low, the membrane is in good condition, and the roof is free from leaks, the condition of the roof timbers can help identify whether there are any current or historical issues present. Timber rot will eventually lead to the degradation of the roof structure, which can be dangerous for occupants.

Timber will eventually rot when subjected to sustained moisture. This can be exasperated when the timber goes through constant cycles of expansion in damp conditions and then contraction as it dries, causing a weakening of the structure. In addition, mould and fungus may appear on the surface, whilst the timber will start to crumble away with little resistance. As wood rot manifests itself, the structure it supports will weaken, leading to a lack of protection, eventually damaging the building and posing a safety risk to occupants. It is critical to assess the structural timber rafters’ condition and ensure no signs of wet or dry rot. The image below shows dampness, structural decay and the formation of mould and fungus, a telltale sign of a high-moisture environment. Although the moisture content is marginally below the 18% threshold, an installation of spray foam would not be recommended until areas of rot are removed and the roof structure is repaired or replaced. If spray foam insulation is installed when timber decay is underway, it may increase the speed of degradation by trapping moisture and causing it to sweat.

Surveying Spray Foam Insulation | Woodworm

Woodworm is another common sign of high moisture content within the timber. Even if the moisture content is low during a pre-install survey, the evidence of pin holes in the wood usually determines that woodworms can thrive within the timber. The woodworm larvae bury into the timber, and when they escape, pin holes form. Depending on the volume and frequency of larvae, multiple holes will weaken the timber and may reduce the structure’s lifespan. When evidence of woodworm is apparent, spray foam insulation should only be installed after consulting with a qualified woodworm treatment organisation and structural assessor who can determine whether the timber will have a sufficient lifespan. Although DIY woodworm treatments are available in most hardware stores, we recommend enlisting the help of professionals whilst ensuring that spray foam is only installed once the timber is free from infestation and the structure has been rendered safe. Checking for woodworm is an essential part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Water Tanks

Occasionally, a spray foam surveyor will encounter attic spaces containing water tanks, particularly in older buildings. Water tanks are generally cold storage that feeds the requirements of cold water tanks in the main living areas. They are usually made from plastic and can be lagged with an insulation jacket to prevent them from freezing during the winter. The image below shows a water tank with the lid removed. It is essential that when spray foam insulation is installed, the lid is tightly sealed onto the tank to prevent contamination of the water whilst stopping water vapour from condensing and increasing the moisture load in the loft space. When the lids are left off the tank, humidity may increase, which can penetrate the spray foam insulation assembly, ultimately deleting the roof structure. Assessing water tanks is an important part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Attic Ducting

It may be expected to see plastic ducting running through the attic space, which is particularly prevalent where bathrooms and shower extraction runs into the ceiling below. In most circumstances, ducting will be vented through the attic’s roof or eaves, which means any extracted moisture from the wet zones will escape the building without accumulating within the roof insulation assembly. The image below shows an example of flexible ducting running from a downstairs bathroom, through the attic and out through the roof to the external environment. This would be an acceptable method of extraction that will not add any increased risk to the roof or insulation assembly. It is, however, essential to ensure that the roof membrane is not damaged from the perforation through the membrane. In the image below, the felt has been damaged and may require remedial repairs before the spray foam insulation can be installed.

Occasionally, ducting may be left open in the attic space and not run through to the external environment. In these scenarios, any moisture extracted from the bathroom or shower will flow into the attic space and may penetrate and saturate the roof assembly due to the airtightness of the spray foam insulation and the monolithic seal from apex to eaves. Before spray foam can be installed, it is imperative that ducting is checked to ensure it is free from perforation and tears and runs out through the roof or down into the eaves soffit, which should also be ventilated. Assessing attic ducting is an important part of the surveying spray foam insulation process.

Surveying Spray Foam Insulation | Existing Ventilation Provision

The survey process should include an analysis of the existing ventilation provision within the building. Where the building has no mechanical extract ventilation in bathrooms, utility rooms and kitchens, there is a heightened risk that interstitial condensation will not escape the building and may seek to migrate to the structural elements. As convection occurs, moisture-rich air carries heat and rises through the building to find cooler air. When moisture reaches high-resistance surfaces that do not allow vapour to permeate and escape, it may accumulate on the interior of cooler surfaces. It may start to degrade the structural elements of the building. In addition, there is a heightened risk of surface condensation and mould forming.

There needs to be more ventilation within a building to prevent a high moisture load from manifesting on the structural elements of the building. The dynamics of a building can be changed dramatically when ventilation is introduced, changing the internal airflow from a high to a low moisture load. Ventilation is excellent for managing moisture but can be bad for heat retention. Modern mechanical ventilation solutions can be programmed to sense humidity and open accordingly to release moisture. In addition, any ventilation system with heat recovery elements will help vastly reduce heat loss whilst effectively reducing the moisture load within the building.

The image here shows bathroom extraction ventilation. Provided the extraction ventilator is automatically activated during use or via humidity sensors and achieves extract ventilation at the specified rate, as shown in Part F of the Building Regulations, the property will likely have a low moisture load. Considering whether there is adequate ventilation in the property is an essential part of the surveying spray foam insulation process.

The image here shows windows with trickle vents integral to the design. Trickle vents are passive openings that help reduce moisture load before penetrating the building fabric. Modern double-glazing systems are likely to contain trickle vents, whereas older-style windows are less likely to include them. Whilst trickle vents can be closed by building occupants, when opened during high humidity occurrences, they can work to release moisture from the building before it attempts to reach the building fabric.

Other ventilation provisions within the property will likely be in kitchen areas through cooker hood extraction. When cooking apparatus is used, there is an increased moisture load, and moisture in wet zones must be handled at the source where possible. The image below shows an example of cooker hood extraction, which should be present in most residential buildings. Establishing that mechanical ventilation is operational and sufficient to meet current Building Regulations is essential.

It is vital to assess existing ventilation provision within the property and assess moisture loads during a hygrothermal assessment. Where ventilation is not present within the property, there is likely to be an increased moisture load, and even though vapour control layers or intelligent membranes can be installed under the spray foam insulation, there could be an increased moisture load within other elements of the building assembly. Remember to record the following information:

  • The make and model of mechanical extraction provision.
  • Confirm that extract ventilation is in working order and can be automatically or manually operated.
  • Check that extract ventilation is used throughout all wet zones, including bathrooms, toilets, utility rooms, and kitchens.
  • Assess the occupancy levels within the property to ensure that ventilation provision is not breached through excess breathing, bathing, or cooking activities. (This may be prevalent in Houses of Multi-Occupation, such as student accommodation.)
  • Use this information to determine whether the property is subject to a low, medium or high moisture load.

Where a building lacks ventilation, there is an opportunity to sell simple strategies to the building owner to help derisk and propose installation. Ventilation can help to make the building and its occupants healthier whilst reducing the ability for dampness and mould to form. It is essential to balance the purpose of the insulation against the heat loss that can occur through ventilation activities. Many modern ventilation systems can be controlled by humidity sensors, which help limit unnecessary openings and retain heat within the building. Contact us to learn more about ventilation systems that can be implemented in the overall insulation strategy. Considering ventilation is an important part of the surveying spray foam insulation process.

Photographs, Videos and Evidence

Once spray foam insulation has been installed as a retrofit solution in a residential dwelling, as and when the building owner chooses to sell, its presence may be challenged by building surveyors, who will likely want to see evidence of the roof condition before it was installed. Mortgage lenders often appoint building surveyors to help them assess risks. Considering that a mortgage lender issues finance against the value of a building, if it were to degrade or structurally fail, the security (building) may not meet the value of outstanding finance, which means the lender is subject to financial loss. A surveyor will check for structural defects to ensure the building isn’t at risk of collapse, including assessing the roof’s condition.

Historically, the spray foam industry has been renowned for providing a lack of detailed survey information and photographic or video evidence to show the condition of the roof and membrane before installation. Since the release of the Inspection Protocol, there is now a requirement for spray foam installers to provide a full handover pack to the building owner upon completion of work; this should include:

Type of Spray Foam Used

  • Open Cell
  • Closed Cell

Certification of the Spray Foam Used

  • BBA Certified
  • or KIWA certified

Roof tile underlay

  • No roofing membrane with Closed Cell applied directly to roof tiles
  • High resistance Bitumen felt membrane with Open or Closed Cells directly applied
  • Low resistance roofing membrane with Open or
  • Closed Cell directly applied
  • Separating card rafter slide with Open or Closed Cell applied

Roof condition

  • Assessment of roof tile condition, including checks for slippages, cracks or dislodgement
  • Checks to determine whether valleys and flashings are intact and no leaks are present

Pre-Installation Evidence (Including Photos/Videos)

  • Condition of the roof before Spray Foam installation (including tile condition and flashings)
  • Moisture content of roof rafters
  • Condition of roof rafters (no rot, dry rot, wet rot or woodworm)
  • Survey report to confirm the suitability of Spray Foam

Overall Condition of the Installation

  • The spray foam is consistently applied throughout the roof space
  • There is no evidence of spray foam delamination from the substrate
  • The spray foam is a white or off-white colour with no evidence of powdery, gloopy or discolouration
  • The spray foam is not crumbly in nature (off-ratio)
  • The spray foam is hermetically sealed with no gaps or shrinkage

Paperwork and evidence

  • A BBA or KIWA certificate for the product installed is available
  • A static or dynamic hygrothermal assessment has been carried out
  • Pre-installation survey evidence is available
  • The Installers workmanship warranty has been provided
  • The product manufacturer warranty is in place
The Property Care Association (PCA) also run a training course for those who would like to learn more about surveying spray foam insulation, particularly once installed. Details of the course can be found here. You may also wish to learn more about the hygrothermal science behind spray foam insulation including instances of when it might be considered a low or high risk to the property. More information can be found in our Independent Hygrothermal Studies Guide.