Danelaw LR150TT - Roof Tile Underlay
Verified by manufacturer 3 months ago
Danelaw® LR150TT
Danelaw® LR150TT
A low resistance vapour permeable roof tile and slate underlay for use in cold and warm roofs.
Application
- A roof tile and slate underlay for pitched roofs.
- Can be used unsupported draped over timber rafters or counter battens, or fully supported over timber sarking or rigid insulation.
Description
Danelaw® LR150TT is a universal middleweight low resistance vapour permeable roofing underlay intended for use on pitched roofs as a secondary barrier installed beneath tiles and slates. The Danelaw® LR150TT has an integral tape to tape system for effectively sealing the horizontal overlaps in moist and dusty conditions. Also available without the integral tape (Danelaw® LR150).
LR150TT:
- Wind uplift resistance at 345 mm batten gauge: 2650 Pa.
- BRE wind zone suitability: zones 1 to 5.
LR150:
- Wind uplift resistance at 345 mm batten gauge: 1214 Pa.
- BRE wind zone suitability: zones 1 to 3.
Features and benefits:
- BBA approved for use in warm and cold roofs.
- Classified as LR (Low Resistance) in accordance with BS 5250.
- Integral tapes for effectively sealing overlaps.
- Reduced condensation risk.
- Durable and resistant to damage from foot traffic.
- UV resistant.
- Temporary weather protection prior to tile or slate fixing.
- Contributes to weathertightness of a completed roof.
- Airtight when sealed for improved energy efficiency.
- CE and UKCA marked.
General information
Color | Grey |
Finish | Other Manufacturer guidanceEmbossed |
Material | Composite |
Shape | Rectangle |
Length | 50000 mm |
Width | 1000 mm 1500 mm |
Uniclass | |
CAWS | H60/3 Roof tiling H67/24 Vapour-permeable underlay H65/22 Vapour permeable underlay H61/22 Vapour-permeable underlay H60/22 Vapour-permeable underlay H60/235 Vapour-permeable underlay H67/290 Vapour-permeable underlay H65/235 Vapour-permeable underlay H62/3 Roof slating H62/235 Vapour-permeable underlay H61/235 Vapour-permeable underlay |
Specification data - Vapour-permeable sheets
Standard | To BS EN 13859-1. |
Third-party certification | British Board of Agrément (BBA) certificate.Guidance for specification option: Certificate number 17/5426. |
Performance criteria | |
Water vapour properties | 0.02 (+0.020/-0.005) sd(m).Manufacturer guidanceWater vapour resistance. |
Fire performance | Class E. |
Tensile properties | Longitudinal/ transverse (before ageing): 350 (±40)/ 210 (±40) N/50 mm. |
Class (minimum) | W1. |
Material | Two layer non-woven spun-bonded polypropylene, with a calcium microporous film. |
Form | Spun-bonded. |
Weight (minimum) | 150 gsm. |
Reflective face | None. |
Width | 1000 mm. 1500 mm. |
Air permeability | 0.04 m³/m² x h x 50 Pa. |
Elongation | Longitudinal/ transverse (before ageing): 60 (±15)/ 75 (±15)%. |
Integral accessories | Integral tape to tape system. |
Sustainability data
Contains Red List materials | No |
Material | Composite |
Recyclability | Recyclable after service life |
Recycled contentAs defined in clause 7.8 of BS EN ISO 14021 | 0 % |
Literature
LR150TT Datasheet
Case studies
On Top of His (Underlay) Game