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DB3.5 Internal Airtightness Membrane
1 × £96.60
Pitched Roof Insulated Above and Below Rafters
This retrofit pitched roof system uses Isolair Multi Insulation Boards in conjunction with a choice of semi rigid batts / flexible insulation, 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
0.26 – 0.08 W/m2.K
y-values
Available upon request from insulation manufacturer.
CROSS SECTION OF SYSTEM
- Roofing (tiles, slates, sheeting etc.)
- 50mm minimum ventilation zone
– 25mm tiling batten
– 38mm counter batten with PAVAFIX SN BAND - Breathable membrane
– 18°+ = ADB Membrane (optional)
– 15-18°= ADB Membrane
– 5-15 ° = UDB Membrane
- Above rafter insulation – ISOLAIR MULTI
- Full fill rafter insulation – PAVAFLEX / PAVATEXTIL-P / ISOLENA OPTIMAL (sheep wool) / INDITHERM
- Airtighness 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
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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 -
HECO TOPIX – Timber FixingsPrice range: £11.01 through £89.46 -
STRH Timber Fixings + Washers – Box of 100Price range: £34.62 through £69.33 -
RK70 – BAUMIT£20.00 (inc. VAT £24.00) -
ADB Breatheable Sarking Membrane£200.67 (inc. VAT £240.80) -
DB3.5 Internal Airtightness Membrane£96.60 (inc. VAT £115.92)
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PAVATEX UDB Weldable Sarking Lining£422.80 (inc. VAT £507.36) -
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 -
PAVAFIX SN Band – Screw Sealing Tape£10.64 (inc. VAT £12.77) -
PAVATAPE (75, 150) – External Weathertightness TapePrice range: £38.64 through £52.90 -
PAVATAPE 12 – Membrane Tape£14.84 (inc. VAT £17.81) -
PAVATAPE FLEX – Penetration Tape£17.08 (inc. VAT £20.50) -
PAVACOLL Adhesive Sealant£7.70 (inc. VAT £9.24) -
PAVAPRIM Primer – 1L£17.50 (inc. VAT £21.00) -
Eaves Ventilation Strip – Aluminium – 2.5m£13.53