Pitched Roof Insulated Between and Below Rafters

This pitched roof system is designed for situations where it is not possible to install Isolair Multi above the rafters. However, a new breathable membrane and counter batten can be installed above the rafters. The system uses a breathable wind tightness layer above an airtightness layer and natural flexible insulation. A rigid Isolair Multi Insulation Board (which is a plaster carrier) is fitted and a 2 layer lime plaster finish is then applied.

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
0.26 – 0.08 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

  1. Roofing (tiles, slates, sheeting etc.)
  2. 50mm minimum ventilation zone
    – 25mm tiling batten
    – 38mm counter batten with PAVAFIX SN BAND
  1. Breathable membrane
    – 15-18°= ADB Membrane
    – 5-15 ° = UDB Membrane
  2. Full fill rafter insulation – PAVAFLEX / PAVATEXTIL-P / ISOLENA OPTIMAL (sheep wool) / INDITHERM
  1. Airtighness and support layer – DB3.5 MEMBRANE
  2. Below rafter insulation – ISOLAIR-MULTI
  3. 6-8mm Baumit RK70N lime plaster base coat with STARTEX embedded mesh
  4. 3-4mm Baumit RK70N lime plaster finish coat

COMPONENTS AND ACCESSORIES FOR PITCHED EXTERNALLY FITTED