480,149 views
Do-it-yourself roof sheathing and counter-sheathing for an extension. For the counter-sheathing, I used a 40x50 mm beam, and for the sheathing, a 120x25 mm board. Before installation, I treated all the lumber with an antiseptic. I fastened the beam and board with galvanized universal screws and roofing nails. I attached a sealant to the beam to press it more tightly against the waterproofing and close the holes in it from staples and nails. The sheathing pitch is 300 mm.