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YBS Roofers Choice Breather Membrane

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www.just-insulation.com 27 Massetts Road Horley, RH6 7DQ, U.K. Email: Click Here VAT Reg: 753 5101 13 Company Reg: 4597028 Page last updated - Monday, November 14, 2011

Roofers Choice Membrane

Multi-layer film laminate

BBA Certified YBS Roofer's Choice multi-layer laminate film composite made with polyolefin materials, offers a pitched roof underlay that has high vapour permeability yet is highly water resistant.

Roofers Choice is the ideal roof underlay for Warm and Cold Pitched Roofs.

 

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YBS Roofer's Choice Breather Membrane Multi-Layer Film Laminate

YBS Roofers' Choice - Breather Membrane Pitched Roof Underlay

Roofers Choice can be installed without the need for roof space ventilation, and is suitable for both Commercial and Domestic buildings, it is the ideal roof underlay for Warm and Cold Pitched Roofs.

Benefits

Manufactured without the use of CFC’s Roofers Choice is 100%
recyclable and is very durable with high tensile strength properties. These coupled with excellent UV and heat stability properties ensure a life-span in excess of 30 years.

Roofers Choice breathable membrane has received BBA Approval and complies with
BS5534-2003 Code of Practice for slating and tiling and NFRCTB6. It also meets technical requirements R3 in relation to NHBC standards, chapter 7.2 pitched roofs.

Recommendations for the use of vapour permeable membranes in pitched roofs are contained in BS 5250 : 2002 Code of practice for control of condensation in buildings.

Product Characteristics

Roll Width = 1 linear metre
Roll Length = 20 metres and 45 metres
Coverage per roll = 20m2 and 45m2 respectively
Roll Weight 2.44 Kgs and 5.5 Kgs respectively
Rolls per Pallet = 39 and 45 respectively
Weight g/m2 122
Water Vapour Resistance Sd (M) = c.0.02 MN/sg = 0.19
Water Vapour Transmission g/m2/24 hr = 1065
Fire Rating = EN13501-1
Exposure Times for UV Degregation - 3 to 4 months

Technical Specification/Properties
Property	Units	Value
Weight	g/m²	122
Water Vapour Resistance	Sd (M) MN/sg	c.0.02 0.19
Water Vapour Transmission	g/m²/24 hr	1065
Fire Rating	-	EN13501-1
Exposure Times UV Degregation	-	3/4 months

 

Certification, Testing and Compliance

BBA Agrement Certificate Certificate No. 07/4420

Installation

Non-Ventilation Cold Pitched Roofs (partially supported)

Roofers Choice when installed as a partially supported system should be fixed in the traditional method for roof tile underlays laid parallel to the eaves and draped between the rafters to ensure that any moisture reaching the underlay will drain away. It is held in place by the tile battens, fixed using staples or large headed nails. Roofers Choice can also be installed by pulling taut from gable to gable provided that a 25mm counter batten is fixed to each rafter.

Prevention of Condensation

The complete roof construction, ceiling boards, underlay, insulation and roof tiles should be considered as a total roof system with regard to condensation risk.

Insulation at ceiling level should be pressed tightly into the eaves against the underlay and all penetrations into, and out of, the roof space should be sealed. More extensive details of this can be found in the BBA certificate Section 5.

Prevention of Condensation (Extensions)

The roof space environment in both the extension and the original part of the dwelling should be the same. If the original part of the roof is vented then the extension should also be vented. Only if the extension is completely sealed off from the original roof should the VapR-free be installed without the aid of roof space ventilation.

Non-Ventilation Warm Pitched Roofs (fully supported) Roofers Choice when fully supported by the insulation can be laid vertically or parallel to the eaves and held in place using counter battens (minimum height 25mm). These in conjunction with 25 mm tile battens will ensure a minimum 50 mm clear airway above the underlay and will assist natural air movement through the batten space. Battens should be fixed using staples or large headed nails.

Roof space ventilation is not required for warm or cold pitched roofs but ridge or high level ventilation over the roof underlay for tight fitting tiles or slates will assist any moisture vapour to disperse more easily when air temperatures are very low.

General

Roofers Choice must be installed with the (Grey) Printed side, face-up and overlapped with the minimum dimensions listed.

Trimming is achieved with a sharp knife. When partially supported with a horizontal lap between battens an extra batten should be introduced 25mm above the bottom edge. This will restrain the lap from opening under wind uplift.

Roofers Choice prevents the ingress of wind driven rain and can be used as a temporary roof covering and left exposed to the elements. However it must be installed as recommended in our technical leaflet or BBA Certificatwith regards to overlaps, fixings, draped between rafters or counter-battened and direct contact with uncured treated timber avoided.

Eaves

YBS Insulation strongly recommend the use of Underlay Support Trays in both open and closed eave construction. Details of this unique versatile product can be obtained directly from YBS Insulation or from one of our stockists.

Packaging and Storage

Roofers Choice is wrapped in polythene and delivered on a pallet. Individual rolls should be
stored on their sides on a clean, dry, flat surface and protected from direct sunlight.

Manufacturer's Contact Details

YBS Insulation Limited
The Crags Industrial, Park Morven Street, Creswell, Derbyshire, S80 4AJ, England

Technical Support 0871 9170044, Email: enquiries@ybsinsulation.com

 

Page last updated Monday, June 6, 2011