Roofshield is a unique, three - layer, nonwoven, spunbonded, polypropylene breather membrane with a patented melt - blown core. It is intended for use as a pitched roof underlay and is fixed beneath tiles and slates.
Roofshield provides a secondary barrier to the ingress of rain, wind and snow. It has a low vapour resistance and is air - permeable; additionally, it eliminates the incidence of interstitial condensation in pitched roofs.
The combination of low vapour resistance and air - permeability eliminates the need for low and high level ventilation. It also negates the need for a vapour control layer or air barrier fixed at ceiling level. This is a basic requirement with other inferior - performing products which are air impermeable and have a significantly higher vapour resistance.
The product provides the most cost - effective solution to controlling interstitial condensation in a pitched roof. The exclusion of ventilation and a vapour control layer eliminates the additional expense of buying extra components and paying for the labour to install them.
NOTE: The British Board of Agrément has issued an Information Bulletin (No. 2) relating to good site practice when using permeable roof tile underlay’s. This highlights:
An underlay is not a total waterproof barrier and if used as a temporary waterproof covering, some rain penetration may occur.
In certain conditions, particularly if there is persistent heavy rainfall combined with subsequent severe freeze/thaw conditions, an underlay should not be exposed for more than a few days.
In the UK, during mild weather conditions, a maximum exposure period of 3 months should be adhered to for Roofshield. In the winter months, or in cases of more extreme weather, this period should be reduced. Guidance on this is given by the BBA in an Information Bulletin on good site practice.
A full copy of this BBA Information Bulletin No.2 – Permeable Roof Tile Underlay Guide to Good Site Practice is available from the BBA web site, www.bbacerts.co.uk.
Commonly described as Duct Tape, Gaffer Tape and Waterproof Cloth Tape. This product has a polythene coating on a cloth backing giving strength, waterproofing and tearability. Used for a multitude of applications including wrapping, holding, temporary repairs on most material. The "get you home" tape is the ultimate all round product.
Reinforced polythene and polythene/foil VCL's
ProSpan WRS is a high performance CFC/HCFC-free rigid polyisocyanurate insulation of typical density 32 kg/m3.
Stainless steel helixical nails. Used to secure counterbattens and over-rafter insulation to the roof structure. To obtain the most suitable PR Nail please complete this form.
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