Client: DB Design and Build

Duration: 2 days

U-value target: 0.12 W/m2K

Air tightness target: no target 

Cost: £28/m2

Installation area: 235m2

Location: Sevenoaks,

Kent, TN13

Existing build-up specifications

  1. Tiles
  2. Battens
  3. Breather membrane
  4. 150mm rafters
  • 185mm Closed cell spray foam insulation
  1. Plaster board
  2. Skim and finish

Proposed build-up specifications

  1. Tiles
  2. Battens
  3. Breather membrane
  4. 150mm rafters
  • Full fill of Icynene H2Foam Lite.
  • 350mm total depth between and over rafters in ceilings and eves.
  • 225 trimmed flush on sloping ceilings.
  1. 60mm insulated plasterboard on sloping ceilings
  2. Skim and finish

Problem

A decision had been made early in the design process to incorporate the benefits of spray foam insulation in the roof structure. The designer had specified using a closed cell foam unaware of the high install costs.

Solution

After meeting with the design and construction teams and understanding the specification London Insulation where able to provide a completes solution using Icynene H2Foam Lite spray foam insulation and ridged insulation boards where necessary.

Result

Savings of a third on this section of the project and only 2 days on site.