RussFast HR Roofing Underlay
Verified by manufacturer 26 days ago
High resistance roofing underlay
Application
Suitable for applications as an impermeable roof underlay in warm and cold roof construction.
Description
RussFast HR Underlay is a heavy-duty roofing underlay which is suitable for both warm and cold roof constructions and is used in conjunction with high and low level ventilation.
Features and benefits:
- Can be used in all UK locations (zones 1–5).
- Excellent nail tear strength.
- Fully watertight and airtight.
- Absorbent under-surface prevents condensation drop off.
- Easy to cut and lightweight for handling.
- No tapes required.
General information
Color | Black |
Material | Plastic |
Shape | Rectangle |
Length | 45000 mm |
Width | 1000 mm |
Warranty description | 15 year |
Uniclass | |
CAWS | H65/5 Roof tiling H67/5 Metal roof tiling H67/110 Metal roof tiling H65/125 Reconstituted slate roof tiling H65/115 Concrete roof tiling H65/105 Clay roof tiling H65/135 Ceramic slate roof tiling H64/110 Wood shingle/ shake roofing H62/145 Roof slating H62/105 Roof slating H62/125 Roof slating H61/105 Roof slating H60/105 Clay roof tiling H60/120 Concrete roof tiling H65/10 Reconstituted slate roof tiling H64/10 Wood shingle/ shake roofing H62/3 Roof slating H60/3 Roof tiling H61/5 Roof slating |
Specification data - Plastics sheets
Purpose | Roofing underlay (impermeable). |
Standard | To BS EN 13859-1. |
Third-party certification | Fully independently certified by BM Trada. |
Performance characteristics | |
Tensile strength (minimum) | MD before artificial ageing: 265 (-15) N/50 mm. |
Tear resistance | MD: 180 (-30) N. |
Water vapour resistance (minimum) | <0.1 N·s/g. |
Physical properties | |
Weight (minimum) | 145 (-5) g/m². |
Dimensions | |
Width (minimum) | 1 m. |
Roll length (minimum) | 45 m. |
Elongation | MD before artificial ageing: 80 (+5)%. |
Flexibility at low temperature | -40 °C. |
Wind resistance | Zones 1–5. Guidance for specification option: BS.5534 compliant and suitable for use in all UK wind zones 1–5. |
Class (minimum) | W1. Guidance for specification option: Before and after artificial aging. |
Sustainability data
Country of product manufacture | United Kingdom |
Material | Plastic |
Literature
RussFast HR Underlay