PAVATEX DSB 2 Membrane
£176.28 (inc. VAT £211.54)
Vapour control and airtight membrane with two-way integrated self-adhesive strips. Applied from outside of truss roof, CLT or similar.
Available to order - Lead time variable.
Vapour control and airtight membrane with two-way integrated self-adhesive strips. Applied from outside of truss roof, CLT or similar. Max exposure time – 60 days. Use Pavatape 12 to seal vertical overlaps.
| Roll Width [m] | Roll Length [m] | Roll Area [m²] | Roll Weight [kg] |
|---|---|---|---|
| 1.50 | 50.00 | 75.00 | 13 |
| Weight | 13 kg |
|---|---|
| Dimensions | 1.5 cm |
FAQs
Frequently Asked Questions (FAQs) about PAVATEX DSB 2 Airtight Roof Membrane
What is PAVATEX DSB 2 and what is it used for?
PAVATEX DSB 2 is a professional-grade airtight and vapour-control roofing membrane designed for roof sheathing in over-rafter insulation systems with PAVATEX soft wood fibre boards. It prevents uncontrolled air movement while allowing controlled moisture diffusion.
Where should the PAVATEX DSB 2 membrane be installed?
This membrane is installed on the roof sheathing in over-rafter roof builds. It should be laid across the top of the structural roof board before insulation panels are fitted, with all overlaps and joints carefully sealed. It can also be installed directly onto the external face of CLT structures prior to the installation of wood fibre insulation.
What are the key physical properties of DSB 2?
PAVATEX DSB 2 is made from a multi-layered polypropylene fleece with polyolefin and copolymer coating, has a vapour diffusion resistance (sd) value of around 2, and comes in 1.5 m × 50 m rolls covering 75 m² per roll.
Does DSB 2 allow water vapour to escape?
Yes. The membrane provides controlled vapour permeability, enabling moisture to diffuse through while still offering airtight performance. This helps minimise the risk of condensation in roof constructions.
How long can the DSB 2 membrane be left exposed to weather?
When mechanically secured, PAVATEX DSB 2 can be left exposed during construction for up to four weeks without degrading, making it suitable for phased roof installation.
What sealing products are recommended for DSB 2 installation?
To ensure airtightness, longitudinal and transverse overlaps should be sealed with PAVAFIX tapes, while connections to masonry and penetrations (pipes, chimneys) should be sealed using PAVATAPE products such as PAVATAPE 12 and PAVATAPE FLEX.
What are the temperature and fire resistance characteristics?
PAVATEX DSB 2 is tested to perform in a wide temperature range (-40 °C to +80 °C) and is classified under EN 13501-1 fire reaction class E, making it suitable for typical roofing environments.
Is DSB 2 suitable for all roof types?
DSB 2 is specifically engineered for over-rafter roof insulation systems with wood fibre insulation. It is ideal for pitched roofs and similar roof constructions where controlled vapour diffusion and airtightness are required.
Can DSB 2 negatively affect indoor air quality?
No. According to the product data, PAVATEX DSB 2 contains no substances likely to be harmful to health or the environment, and complies with standard health and safety requirements.
How should the membrane be stored before installation?
Store rolls in a dry, cool place, either upright or lying flat, and keep them protected from direct sunlight and moisture to preserve material performance until installation.