The Inspection Protocol

Launched in March 2023, the Inspection Protocol represented an educational summary of Spray Foam Insulation along with a flowchart pathway to help building surveyors establish the risk the Spray Foam Insulation posed on the structural assembly of the property. The criteria that determine the risks 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.

Historically, the above information may have yet to be provided by the spray foam installer upon completion of installation because there was no recognised Best Practice Guide in place and, instead, reliance upon the BBA or KIWA Agrement certification as the guide. Whilst the BBA or KIWA certification remains the guide under which installations should be carried out, ThermoFoam have a Best Practice Guide, specific to our Enverge range of spray foams and available to all approved installers.

Many spray foam manufacturers have implemented Best Practices and robust training schemes for installers, which should provide confidence to mortgage lenders and surveyors that the spray foam industry has become more regulated. Due to the varying product test data available to manufacturers and installers alongside product-specific processing parameters, Best Practice should incorporate industry standards for insulation applications accompanied by product-specific instructions. 

Backed with a clear mandate through BBA or KIWA certificates and accompanying scientific evidence on how spray foam installations should be conducted, we hope there will be a proactive response from building surveyors and mortgage lenders to support the efforts to establish more precise installation guidelines and best practices. With homeowners requiring a wide range of insulation options when considering how to improve the thermal performance of their buildings, insulation products that are certified to be installed must be regarded as compliant where the relevant pathways from the Inspection Protocol determine so.