Spray Foam For Flat Roofs
About Spray Foam For Flat Roof’s
High quality flat roof insulation is a vital part of protecting a building from heat loss.
Spray Foam can offer a viable alternative to using pre-manufactured insulation materials in flat roofs. Whether installed above the roof deck or to the underside, spray foam provides great airtightness.
Airtight
Spray Foam creates an airtight thermal seal against heat loss
Thermal
Spray Foam has excellent thermal performance per inch
Fast Install
Spray Foam is a fast and effective alternative to traditional materials
Airtight
Spray Foam creates an airtight thermal seal against heat loss
Thermal
Spray Foam has excellent thermal performance per inch
Fast Install
Spray Foam is a fast and effective alternative to traditional materials
Where To Use Spray Foam For Flat Roofs
Flat Roofs generally have high-resistance waterproof protection above to prevent moisture ingress into the internal features. This makes the ventilation requirements particularly important for flat roofs. Nexseal LE Closed Cell spray foam can be used on top of a flat roof to create a warm roof provided it is suitably protected by a waterproof membrane. Alternative, Sucraseal open cell spray foam can be used under the flat roof deck provided there is either a ventilated void between insulation and deck, or a robust vapour control layer on the warm side of the insulation to prevent interstitial condensation from penetrating the insulation.
New Build Construction
In new build properties, it’s common for PIR sheets to be used on the underside of flat roof decks with an air gap above for ventilation. In many circumstances, Spray Foam Insulation can be applied directly to the flat roof deck, helping to save space and time whilst adding airtight performance.
Posi (Metal Web) Joists
Many new build flat roofs use Metal Web Joists. Whilst the web provides excellent structural strength, it can be hard to insulate using traditional materials. Spray Foam insulation is the ultimate solution as it’s manufactured in situ and will expand through the web for seamless thermal performance.
Retrofit Flat Roof Voids
If you already have a flat roof at your property that has no insulation between the plasterboard ceiling and external flat roof deck, Spray Foam can be injected through small drill holes between the joists. The expansion of the open cell foam will fully fill the void to improve thermal performance.
What Our Clients Say
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We’re proud to work with a range of clients across many industry sectors.
How We Help You
Enquire
Get in touch today to get the ball rolling
Specify
Let us specify the requirements for your project
Pricing
We’ll provide you with a budget price range
Install
Use one of our ThermoFoam-approved installers
Warranty
Once installed, we provide a 25-Year Product Warranty
Gallery
Check out our Gallery where you will find some photographs of installations we’ve completed in the past. Whilst spray foam is insulation and not decoration, our experienced installation teams will always endeavour to provide a neat and tidy finish to the insulation. Nexseal LE closed cell is easier to achieve a neater finish whereas Sucraseal Open Cell expands at a faster rate to leave an undulated finish.
FAQs
Depending on the roof make up and any high resistance flat roof covering, Spray Foam generally complies with BS5250 ventilation strategies provided a dynamic (or static) condensation risk analysis is produced before install. In instances where an air void is required between the insulation and roof deck, we can use a laminated card slider that the foam is applied to. This creates a natural air void for ventilation compliance.
The metal web running through the joist and can make it tricky to insulate with traditional materials and therefore a seamless layer can rarely be achieved. When spray foam is used for Posi-Joists, the foam is applied as a liquid and can be joined between the joist to provide a monolithic layer. This eliminates thermal bridging and provides maximum thermal values to achieve u-value targets.
Pre-manufactured insulation materials can shrink, slip and degrade, especially with gravitational pull. Spray foam is entirely different because it is manufactured in-situ, therefore spray applied to the underside of the flat roof deck. The spray foam itself remains in an inert, unchangeable state once applied and it will therefore last with the life of your property.
It’s common for us to help customers who had flat roof extensions added to their homes in the 1980’s and 1990’s where good insulation wasn’t really considered. In these scenarios, we can minimise disruption to your home by drilling small holes approx. 500mm apart throughout your ceiling where we inject our open cell spray foam to fully fill the empty void. This will add substantial thermal performance to help you live more comfortably.
Provided access is good and the depth/type of insulation required, around 200m2 of open cell insulation can be installed each day and 100m2 of closed cell insulation. Considering many construction projects take several days to insulate with wastage to dispose of, Spray Foam insulation can truly help to speed up your project. Less disruption, less wastage and a compliant system.
Yes, you can use our Nexseal LE Closed Cell Foam on top of the flat roof deck. The product is rigid and high resistance which makes it a perfect insulation solution for a strong and stable roof. However, Nexseal LE must be protected with a waterproof layer as with any type of external flat roof insulation.
Our Products
Check out our BBA Certified Spray Foams
Our range of open and closed cell spray foams are industry-leading, BBA-Certified, use recycled materials and contain water-based blowing agents.
Nexseal Closed Cell
