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.
SYSTEM PERFORMANCE
U-values
0.44 – 0.15 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
- 50mm minimum ventilation zone
- Secondary weather proofing Insulation Layer
-30mm ISOLAIR MULTI boards fixed to timber battens. - Full-fill rafter insulation – PAVAFLEX / PAVATEXTIL-P / SHEEP WOOL / INDITHERM (Hemp)
- Airtightness and support layer DB3.5 MEMBRANE
- Below rafter insulation – ISOLAIR MULTI
- 6-8mm Baumit RK70N lime plaster base coat with STARTEX embedded 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 -
INDITHERM® Hemp InsulationPrice range: £27.92 through £61.82 -
ISOLENA Optimal Sheep Wool Insulation RollsPrice range: £113.67 through £133.41 -
PAVAFLEX Plus 36 Wood Fibre InsulationPrice range: £497.75 through £548.50 -
PAVAFLEX Wood Fibre InsulationPrice range: £29.87 through £520.00 -
PAVATEXTIL P Thermo-Acoustic InsulationPrice range: £55.61 through £453.40 -
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