Pitched Roof Insulated Below Rafters

This retrofit pitched roof system is installed from inside the building and uses Isolair Multi Insulation Boards in conjunction with breathable membrane and a lime plaster finish.

This system offers high protection from summertime overheating, outstanding thermal performance, humidity regulation, acoustic insulation and superior sustainability credentials. This low embodied carbon solution is a great choice for specifiers and homeowners alike. Wood fibre roofs are a sustainable and reliable system for upgrading the UKs existing buildings.

roof insulation system

SYSTEM PERFORMANCE

U-values
0.71 – 0.17 W/m2.K

y-values
Available upon request from insulation manufacturer.

PRODUCT DOWNLOADS

Pitched Roof – U-Value Guide

Pitched Roof – Technical Manual

Pitched Roof – Take Off Form

Retrofit Roof Pitched Externally Fitted System Sheet

BBA – Pitched Roof

10 Year Warranty

Manufacturers Website

CROSS SECTION OF SYSTEM

pitched roof system below rafters
  1. Roofing (tiles, slates, sheeting etc.)
  2. Existing tiling battens / timber sarking
  3. Existing non-breathable membrane
  4. Ventilation zone between existing rafters
  1. Secondary weather proofing Insulation Layer
    – ISOLAIR MULTI fixed to timber rafters.
  2. Airtightness and support layer DB3.5 MEMBRANE
  1. Below rafter insulation ISOLAIR MULTI
  2. 6-8mm Baumit RK70N lime plaster base coat with embedded STARTEX mesh
  3. 3-4mm Baumit RK70N lime plaster finish coat

COMPONENTS AND ACCESSORIES FOR PITCHED EXTERNALLY FITTED