Client: Heritage construction

Duration: 1 day

U-value target: 0.18 W/m2K

Air tightness target: no target 

Cost: £28/m2

Installation area: 50m2

Location: Luton, LU2

Existing build-up specifications

  1. Tiles
  2. Battens
  3. Breather membrane
  4. 150mm rafters
  • 50mm ventilated air gap
  • 100mm rigid insulation board
  1. 60mm insulated plasterboard
  2. Skim and finish

Proposed build-up specifications

  1. Tiles
  2. Battens
  3. Breather membrane
  4. 150mm rafters
  • no air gap (Icynene is breatheable)
  • 150mm Icynene H2Foam Lite on sloping ceilings
  • 220mm Icynene H2Foam Lite in ceilings and eves.
  1. 60mm insulated plasterboard on sloping ceilings
  2. Skim and finish

 

Icynene H2Foam Lite spray foam insulation installed between 150mm rafters. Cut back on sloping ceilings and over sprayed above to a depth from roofing membrane of 220mm. 
Installed in Kitchen, Wet room, Study, Conservatory and 1st floor bedroom.

Ian Brian- Director, Heritage Construction. Restoration and conservation specialists.