Pitched Roof Insulated Between & Below Rafters (option A)

This is the first of 2 options for an internally-fitted pitched roof insulation system insulated between and below rafters. It is designed to be retro-fitted from the inside of the building. It comprises predominantly of rigid Isolair Multi wood fibre Insulation Boards, flexible natural insulation between the rafters and a lime plaster finish.

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

roof insulation system

SYSTEM PERFORMANCE

U-values
0.44 – 0.15 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 between and below a
  1. Roofing (tiles, slates, sheeting etc.)
  2. Existing tiling battens / timber sarking
  3. Existing non-breathable membrane
  4. 50mm minimum ventilation zone
  1. Secondary weather proofing Insulation Layer
    -30mm ISOLAIR MULTI boards fixed to timber battens.
  2. Full-fill rafter insulation – PAVAFLEX / PAVATEXTIL-P / SHEEP WOOL / INDITHERM (Hemp)
  3. Airtightness and support layer DB3.5 MEMBRANE
  1. Below rafter insulation – ISOLAIR MULTI
  2. 6-8mm Baumit RK70N lime plaster base coat with STARTEX embedded mesh
  3. 3-4mm Baumit RK70N lime plaster finish coat

COMPONENTS AND ACCESSORIES FOR PITCHED EXTERNALLY FITTED