Divide the roof width by the product's effective cover width and account for end laps along the slope. Add sheets or length for cuts and detailing.
Sheet Coverings for Sheds, Garages and Outbuildings
Roofing sheets cover large areas with fewer joints than small-format tiles, making them practical for sheds, garages and other specified outbuildings. MacBlair stocks sheet coverings for projects where material, profile, pitch and support spacing have been established.
Use the manufacturer's cover width rather than overall width when calculating quantity. End laps, side laps, sheet length and purlin spacing depend on profile and exposure. Condensation control also needs attention beneath uninsulated sheet roofs, particularly over enclosed or humid spaces.
Support the sheets on specified roof timbers and use matching sheet fixings and washers. Complete edges with compatible ridge and verge details, and add roof ventilation where required. Never stand between supports on a sheet roof.
Roofign Sheets FAQ's
Minimum pitch depends on sheet material, profile, lap and seal arrangement. Follow the specific product instructions, not a general sheet-roof figure.
Fixing position varies by material and system. Use the maker's pattern, washer and torque guidance to avoid leaks or sheet distortion.
Provide the specified ventilation, insulation and vapour-control build-up. Some sheets offer anti-condensation backing, but it still needs airflow and drainage.
Treat them as fragile unless the manufacturer states otherwise. Use planned access equipment and load-spreading measures without stepping between supports.