Spray Foam Insulation

New pitched roof insulation

WALLTITE® is applied directly to the breathable roofing membrane between timber rafters in tiled or slated pitched roofs.

WALLTITE® has a measured water vapour permeability, therefore it does not compromise the performance of any breathable membrane, or the timbers to dry out when subjected to periods of solar radiation.

The system minimises unwanted air leakage and air infiltration.

Features and benefits

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

Sustainability - sustainable over the life span of the building, WALLTITE® can even prolong the buildings life as it protects against premature deterioration of building materials.

Design freedom - WALLTITE® also provides the specifier with complete design freedom as the spray foam adapts to the shape of the substrate providing 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 any possible detachment, common with other types of insulation.

Occupier comfort - for building occupiers, WALLTITE® 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 - WALLTITE® is only installed by trained professionals approved by BASF in the UK.


WALLTITE® has undergone various performance tests. Certificates are available on request.

LABC RegisteredNBS Plus

Typical detail

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 air space
  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. WALLTITE® 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

Additional resources

Case studies

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