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Danelaw LR150TT - Roof Tile Underlay

Verified by manufacturer 3 months ago

Danelaw® LR150

Hambleside Danelaw Ltd Variant:

A low resistance vapour permeable roof tile and slate underlay for use in cold and warm roofs.

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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 guidance

Embossed

Material

Composite

Shape

Rectangle

Length

50000 mm

Width

1000 mm

1500 mm

Uniclass

Pr_25_57_10_94 Vapour-permeable sheetsPrimary

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 guidance

Water vapour resistance.

Fire performance

Class E.

Tensile properties

Longitudinal/ transverse (before ageing): 350 (±40)/ 210 (±40) N/50 mm.
Longitudinal/ transverse (after ageing): 320 (±40)/ 180 (±20) 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)%.
Longitudinal/ transverse (after ageing): 40 (±10)/ 50 (±10)%.

Sustainability data

Contains Red List materials

No

Material

Composite

Recyclability

Recyclable after service life

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

0 %

Literature

LR150TT Datasheet

LR150TT Datasheet

Case studies

On Top of His (Underlay) Game

On Top of His (Underlay) Game