Client: CJ Turner and Sons

Duration: 1 day

U-value target: 0.18 W/m2K

Air tightness target: no target 

Cost: £20/m2

 

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
  1. 60mm insulated plasterboard
  2. Skim and finish

Testimonial

‘We had a complicated roof structure on a large loft conversion. - lots of hips, valleys, dormer windows and roof lights. Insulating the roof the conventional way with ridged foam boards between the rafters would have been very time consuming (cutting the ridged board into all of those difficult angles,) and required a great amount of on-site storage for the material and generated a lot of waste.’

 ‘London Insulation approached me with the option of applying Icynene spray foam directly to the roofing membrane. Along with the BBA certification, London Insulation produced a u-value calculation and condensation risk analysis. This satisfied the building inspector.’

 ‘London Insulation completed the 240m2 installation in one day including removing all waste from site. This reduced the build process by 4 days, allowing my team to follow on directly with plaster boarding and second fix. The cost for this service from London Insulation was comparable to using the ridged insulation boards.’

‘The client is also very pleased with the upgraded insulation. The effect of the insulation and air tightness has made for a more comfortable and stable indoor environment and greatly reduced her heating bills. Offering this premium product to clients will give me a competitive edge.’

 Cliff Turner. Director of CJ Turner and Sons – Loft conversion specialists