Spray Foam Insulation

Hard to treat cavities

A solution for hard to treat cavities

Hard to treat cavities are defined as:

  • Masonry cavities less than 50mm wide
  • Prefabricated concrete construction systems with cavities
  • Metal frame construction systems with cavities
  • Random stone cavities
  • Timber studwork cavity
  • Buildings more than three stories tall
  • Walls exposed to severe wind driven rain

The most cost effective and least disruptive way to treat cavities of this kind is to inject insulation material directly into the existing cavity.

WALLTITE® CV 100 is the injection grade. Applied in liquid form, the WALLTITE® CV 100 takes fractionally longer to expand into its finished closed cell foam, ensuring that all irregularities within the cavity are covered, sealed and insulated.

Injected into the hard to treat cavity, WALLTITE® offers the following advantages to specifier and homeowner:

  • The product bonds permanently to any substrate material, providing additional structural stability to existing cavity wall structures.
  • WALLTITE® will also provide an airtight insulation layer around a house whose fabric has previously allowed significant air leakage.
  • The injection process requires holes of just 12mm diameter to be drilled in the mortar.  No bricks will be damaged and, once repointing has taken place, there will be no sign of the installation.
  • Only BASF approved Foam Master qualified companies can install WALLTITE®.

The results that can be achieved will vary depending on the material used, but calculations based on the use of WALLTITE® CV 100 rigid closed cell foam insulation injected into a 40mm cavity suggest that the U-value of the refurbished wall should be in the region of 0.46W/m2K to 0.56W/m2K depending on the make up of the internal and external walls.


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

LABC RegisteredNBS Plus

Additional resources


Below is a short video demonstration on how WALLTITE® works in an uneven cavity


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