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MARCH 06 - SINGLE-SOURCING COMPLIANCE FOR BOTH FLAT AND PITCHED ROOFS



Planning constraints on the height of a new development of apartments have been overcome by Taylor Woodrow for Bryant Homes by innovative design of the roof.

The site, College Fields in Widnes, faces a row of bungalows, prompting planners to give permission for the pair of the two-storey blocks comprising a total of 60 two bedroomed apartments with the proviso the building height did not impede the view for the established homes. Taylor Woodrow's solution, to maintain an aesthetic exterior aspect, was to design one of the blocks with two pitched elevations front and back connected by a flat roof, so that from ground level, the timber frame blocks give the appearance of being pitched.

To ensure the construction fully complied with Building Regulations, particularly Document F2 Condensation in Roofs, Taylor Woodrow turned toAvonside Roofing, one of its approved subcontractors, to design a roof construction that provided adequate ventilation fot both flat and pitched areas. As a result, Avonside utilised Glidevale Protect A1 impermeable roofing underlay, Fulmetal Rediroll eaves ventilation system, Premier in-Line Tile Ventilators and MT5U flat roof ventilator terminals have been fitted to the roofs by subcontractor Avonside Roofing.

Tracey Slann, project QS, explained, "We needed to have adequate ventilation to the roofs, but had to address the combination of flat and pitched roofs. Avonside in conjunction with Glidevale designed the scheme for us, to ensure the roof complied with all Regulatory requirements, and looked as aesthetically pleasing as possible because of the homes across the road. "

Protect A1 is a third generation roofing underlay, developed specifically to overcome the disadvantages of Type 1F felt and plastic sheet materials. It was the first real alternative to traditional 1F felt, and is BRE certified to provide fully unrestricted use for wind uplift in all exposure conditions. Completely waterproof, UV and heat stabilised, it is unaffected by temperature changes and can be used as a temporary roof covering before installation of the roof tiles or slates. At only 7kg for a standard roll, it is easy to manoeuvre on site, yet still has the weight to resist wind noise.

Claimed to be truly universal, Fulmetal Rediroll is a colour co-ordinated continuously ventilated aluminium roll system which includes a unique mechanical fixing for the ridge tiles. It is simply laid across the top course of tiles or slates underneath the ridge tiles to provide integral ventilation and resistance to rain penetration, avoiding potential damp and condensation issues in the roof void. Its metal construction means it is rot proof and corrosion resistant, ensuring a longer lifespan against conventional fabric- or thin polymer-based systems. It eliminates the need for ridge fillers and unions, fits all tile profiles, and requires no special tools, meaning one product can be used for all appropriate jobs, and regardless of weather, increasing the roofers' productivity and profitability.

Premier In-Line Slate & Tile Ventilators are specifically designed to be installed as part of the roofing process and blend in with the roof profile, providing unobtrusive ventilation at high level across the roof of up to 10000mm 2 /m. They are AA fire rated, enabling unrestricted use in pitched roofs regardless of proximity of adjoining/ neighbouring properties.

Glidevale MT5U flat roof terminal ventilators ensure a nett free ventilation area of 20,000mm 2 /m and are deluge and driving rain resistant. They can be used for warm or cold deck roofs, and provide low resistance to airflow.

Glidevale offers a optional design and product 12 years guarantee, insurance backed, for all roofing systems it designs, provided the products specified are fitted, and installed correctly. Part of the Building Product Design Group, Glidevale operates a programme of continuous research and development to bring to market innovative yet practical products in line with changing requirements.

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