Cornish Units

There were 30,000 built in the 40's and 50's. Two types, type 1. Reinforced concrete columns with un-reinforced concrete panels slotted between them in pre-formed grooves. First floor and roof a tile hung timber structure. Type 2. Introduced in 1953 quicker and cheaper to build concrete linings replaced by dry lining.

It is extremely unlikely that an overall unsafe condition would arise without considerable visual signs of deterioration. The condition of most Cornish dwellings is good. Deterioration appears to be limited to discrete groups on occasional estates. Minority of columns and other reinforced concrete components are cracked due to corrosion of reinforcement. Cracking caused by carbonation cracked concrete.

Remove concrete in affected area, clean steel and patch repair. If carbonation exists but does not display cracking additional protection may be provided by surface coating formulated to restrict the transmission of carbon dioxide.


Improved high thermal targets can be achieved from 0.30 U-value onwards using the different insulation types and thicknesses as be determined by the specification requirements.

System Components - Options to suit specification requirements

  • Lambdatherm Grey EPS Insulation Boards
  • White EPS Insulation Boards
  • Phenolic Insulation Boards
  • Rockwool Insulation Boards
  • Insulation Adhesive
  • Insulation Fixings
  • Basecoat
  • Reinforcing Mesh

Topcoat Finishes to select from

  • Dash aggregate
  • Silicone/Acrylic Topcoat
  • Envirobrick "brick effect" Render
  • Granomin + Nanosil Finish Topcoat
  • Brick Slip Systems
  • Colour samples are available on request for the different finishes

For a full technical consultation, survey and project specific report and specification please contact our technical department on 0845 1300 983 or email at