Fibreglass Flat Roofing Solutions
A Fibreglass roofing system is ideal for flat roofs such as garages, dormers, porches, extensions, it offers a seamless cold applied membrane that is a maintenance free solution to problems traditionally associated with flat roofs.
GRP (Glass Reinforced Polymer) fibreglass laminate is formed on site to give a continuous, highly durable, weather proof layer with no seams or joints. Because the System is cold applied, there is less disruption and fewer safety considerations.
Suitable for both a warm or cold roof.
Polyroof Offer 20 year manufacturer’s guarantee on it's Polyroof 185 system but its service life will extend beyond that. In fact the system has been independently assessed by the BBA and is durability-rated for 30 years.
What is Polyroof 185?
It is a complete composite roofing solution with a fibreglass reinforced, advanced polymer system which produces a highly durable seamless membrane for ultimate waterproof protection.
Who is Polyroof?
Polyroof Products Ltd is one of the country's leading suppliers of cold applied, liquid roofing systems. The company was first established in 1984
What is cold-applied liquid waterproofing?
This method avoids the use of heat or flames.
Does it work on sloping roofs?
Polyroof 185 was principally developed as a flat roof system, but it is often used on pitched roofs. For example porch roofs or the roofs of sheds
This construction relies on a minimum 50mm unobstructed void and an adequate cross-flow of ventilation and is generally adequate for low risk condensation areas only.
Traditionally, flat roofs simply consisted of a structural timber deck with a waterproof covering directly applied to the top of the deck. Where a cold flat roof does incorporate insulation this is in the form of mineral wool stuffed in between the timber rafters/joists, with a 50mm (2 inch) unobstructed gap between the insulation and the roof deck. This gap is necessary to allow air-flow, so that warm, moist air, is allowed to escape the roof, rather than coming in to contact with the 'cold deck' and condensing. Condensation can lead to rotting timbers and damp ceilings, especially where moisture levels are high such as over bathrooms and kitchens. Soffit vents are sometimes fitted to the underside of the fascia boards, but, as many flat roofs were built without soffits, is often in the form of unsightly 'mushroom vents' on top of the roof, or soffit vents incorrectly fitted in to the fascia boards. Unfortunately this means a great deal of heat is also lost in the process.
By moving the insulation to the outside of the structure, the roof deck is effectively brought inside, which results in a 'warm deck' (hence the name), this removes the the possibility of condensation forming on the underside of the deck and eliminates damp. Because this design works by conserving heat, no ventilation is required. Modern polyisocyanurate (PIR) foam rigid insulation with reflective foil to both sides provides more than double thermal efficiency compared to mineral wool, and unlike the cold roof method the insulation thickness is not limited by the depth of the timber rafters/joists. A vapour barrier or vapour control layer is an essential component of any warm roof.
constructing a flat roof, giving the best thermal performance and vapour control, whilst maximising flexibility of design by reducing the need for natural ventilation. In general, any high risk condensation areas should have a Warm Roof construction. General advice for Warm Roof constructions can be found in BS 5250 : 2002. Care should be taken to ensure the chosen insulation can withstand the loads likely to be applied to the roof, particularly in balcony and walkway applications. We recommend when fixing to joist or metal deck, that a layer of plywood is incorporated prior to fixing the insulation, to act as a spreadsheet and avoid point loading. Standard Calculations based on British Standard BS.6229, exist for checking the thermal characteristics and condensation risk for a roof construction. It is recommended that whenever a warm roof is specified, and particularly over a humid environment, that these calculations are carried out. The majority of insulation manufacturers such as Kingspan provide a calculation service and our own technical department can provide standard calculations, if supplied with full construction and environmental details.