Installing a long run steel roof:
Remove all existing roof covering as far as weather permits for the time you have and you are ready to begin. Measure length from ridge board to a point 2- inches (50 mm) into the guttering. Minus 1-inch (25 mm) for allowance for the house being slightly off square.
Locate the new sheets for this measurement and roll out insulation paper and cut to this length. Place this first roll at the top of the roof and staple it down. Then let the rest of this mini roll drop down the purlins into the spouting. Staple it down. Or use galv flat head nails or mini paper clips if available to hammer down.
If starting next to a gable end bargeboard. Position first sheet edge so that a 6-inch (150 mm) side flashing will fit well ending its edge neatly over the top of the second top corrugation in. Now before fixing make two marks on the bottom edge of the sheet 2-inches (50 mm) back to show where the sheet passes by the fascia board and into the spouting. When these two marks are on the fascia you are square with the house and ready to place your first fixings. Do so to secure the sheet. Now you can work off this sheet. Mark the center of the timber or steel purlins onto the sheet edge where you will still see the mark after lapping the next sheet over.