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.
SYSTEM PERFORMANCE
U-values
0.71 – 0.17 W/m2.K
y-values
Available upon request from insulation manufacturer.
CROSS SECTION OF SYSTEM
- Roofing (tiles, slates, sheeting etc.)
- Existing tiling battens / timber sarking
- Existing non-breathable membrane
- Ventilation zone between existing rafters
- Secondary weather proofing Insulation Layer
– ISOLAIR MULTI fixed to timber rafters. - Airtightness and support layer DB3.5 MEMBRANE
- Below rafter insulation ISOLAIR MULTI
- 6-8mm Baumit RK70N lime plaster base coat with embedded STARTEX mesh
- 3-4mm Baumit RK70N lime plaster finish coat
COMPONENTS AND ACCESSORIES FOR PITCHED EXTERNALLY FITTED
-
ISOLAIR MULTI Wood Fibre Insulation BoardsPrice range: £18.47 through £1,232.00 -
STRH Timber Fixings + Washers – Box of 100Price range: £34.62 through £69.33 -
RK70 – BAUMIT£20.00 (inc. VAT £24.00) -
DB3.5 Internal Airtightness Membrane£96.60 (inc. VAT £115.92) -
BAUMIT STARTEX£61.49 -
ISO-BLOCO 600Price range: £13.79 through £41.17 -
PAVAFIX Airtightness Tape (60, 20/40, 150)Price range: £21.21 through £56.00 -
PAVATAPE (75, 150) – External Weathertightness TapePrice range: £38.64 through £52.90 -
PAVATAPE FLEX – Penetration Tape£17.08 (inc. VAT £20.50) -
PAVAPRIM Primer – 1L£17.50 (inc. VAT £21.00) -
Eaves Ventilation Strip – Aluminium – 2.5m£13.53