Roof (Standard Construction)
The roof utilizes the preformed aggregate coated Metrotile® steel tile system, available in several colours, fixed to 50x25mm treated timber battens over Corovin® breather membrane.
Battens are secured to dual pitch (single wide) or monopitch (twin) nail plated timber roof trusses (produced in our own truss-press) formed from 72mm and 56mm timbers 30mm and 45mm thick. They are positioned at 400mm or 600mm centres with a pitch of 19º. Twin homes provide central support to the roof trusses via proprietary ‘I’ beams.
Ceiling decks of 12.5mm foil backed plasterboard glued and screwed to roof trusses, insulated with 250mm A+ ‘Earthwool’ mineral wool insulation with an A1 fire classification and containing up to 70% less embodied energy – a truly planet friendly material. ‘Earthwool’ is made from recycled materials and can be fully recyclable at the end of its life. The roof void is cross-ventilated via the eaves that have various widths depending on the style of the home.
Rainwater down-pipes and gutters are in PVCu but some homes have galvanized systems. Fascias and bargeboards are also in PVCu. The roof ‘U’ value is 0.18 W/m²/K or better representing a 10% improvement on BS3632:2015. Due to transport limitations the Heritage has a roof pitch of 16.4⁰.