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Pitched Roof Insulation

Our spray foam insulation for residential and commercial customers is applied directly to the breathable roofing membrane between timber rafters in tiled or slated pitched roofs. The system minimises unwanted air leakage and air infiltration.

WALLTITE® spray foam has a measured water vapour permeability, so does not compromise the performance of any breathable membranes, or cause timbers to dry out when subjected to periods of solar radiation.

To find out more about our pitched roof insulation options, get in touch with our team of expert installers today on 0800 690 6338.

Features and benefits of our pitched roof insulation

Energy efficiency – spray foam insulation leaves a minimal amount of surface area without insulation, resulting in an up to 30% decrease in thermal transmission and an airtight building envelope of low permeability, without the need for supplementary material.

Sustainability – sustainable over the lifespan of the building, our pitched roof insulation can even prolong the building's lifespan, as it protects against premature deterioration of materials.

Design freedom – We provide the specifier with complete design freedom, as the spray foam adapts to the shape of the substrate. This provides an ideal solution for insulating difficult areas such as profiled and curved roofs. The product is self-adhesive and stays fully bonded to the substrate, preventing the possible detachment that is common with other types of insulation.

Occupier comfort – spray foam insulation makes a significant contribution to a comfortable indoor climate by creating a draft-free environment that prevents the infiltration of pollutants, toxins and allergens.

Reliability – our spray foam is only installed by trained professionals approved by BASF in the UK.


BBA Certificate No. 11/4816.

Bright Home Renewables Insulation has undergone various performance tests. Certificates are available on request.

BBA CertificationLABC RegisteredNBS Plus

Typical details for our roof insulation

New Roof With Breathable Underlay

New roof with breathable underlay

  1. WALLTITE® CL100 insulation to achieve target U-value
  2. Vapour control layer
  3. Plasterboard and skim
  4. Unventilated airspace
  5. WALLTITE® returned to insulated cavity stop at head of wall
  6. Breathable roof tile underlay

Habitable space: plasterboard and skim/VCL with taped joints VCL to be carefully cut and sealed around struts, ceiling joists and penetrations); batten/counter batten rafters as necessary to achieve insulation depth, confirm rafter strength sufficient to receive counter battening and boarding if required.

Loft space only, non-habitable: insulated between and over rafters to achieve target U-value. Bright Home Renewables Insulation may remain exposed.

Technical Data

Specification Spray-applied polyurethane foam between rafters, directly onto breather membrane        
NBS clause P10 15A        
Air leakage (50mm) 0.0033m3hrm2        
Conforms to Part L1A 2010, Appendix A        
Lambda 90/90 0.025W/mK        
Fire rating Class 1 to BS 476: Part 7        
Water vapour diffusion resistance factor 61.12        
Adhesion to roof tile underlay 232kPa        


Thickness of WALLTITE (mm) U-value (W/m2k)                    
200 0.13                    
175 0.16                    
150 0.18                    

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