Insulating a roof
DRAUGHTPROOFING BETWEEN RAFTERS FITTING BLANKET INSULATION FITTING SHEETS OF EXPANDED POLYSTYRENE
Standard building paper consists of two sheets of tough paper held together by a central layer of bituminised fibre netting. The paper is available in rolls of 3Oft x 3ft (10 m x 1m) from most buflders' merchants.
Things you will need
Tools Steel tape measure, scissors, pin hammer, waterproof adhesive tape.
Materials Rolls of building paper, brass drawing pins.
1. Measure the gap between two rafters and cut the building paper into strips that are slightly wider than the gap.
2. Start at the top of the roof and pin the paper to the rafters on each side at intervals of about 4in (100mm).
3. Take the paper right down to the eaves. Push out the end of each strip of paper so that any in-blown rain or snow cannot drip onto the loft floor.
4. To join the paper, make an overlap of at least 4in (100mm) and tape over the join with adhesive tape.
Things you will need
Tools Heavy-duty scissors or an old serrated knife (such as an old bread knife), hammer, steel tape measure, face mask, Possibly cotton gloves if your skin is sensitive to fibres.
Materials Rolls of glass-fibre or mineral-fibre blanket, tacks, ball of string.
1. Starting at the top, hammer a tack into the side of a rafter. Do not hammer it right in, let it protrude by at least 1/4in (6mm).
2. On the adjacent rafter, hammer in another tack about 6in (150mm) farther down. Continue in this way, alternating between sides and moving gradually down the rafter until there are tacks sticking out from both sides from top to bottom.
3. Measure the gap between the rafters and cut blanket to fit.
4. Tie the end of the string to the tack at the top of the rafter.
5. Place the insulation material between the rafters. If possible, get someone else to help you.
6. Starting at the top, wind string between the tacks so that it zigzags down to hold the blanket in place.
7. Continue this procedure. If you have to join pieces of blanket, butt them together.
1. Cut a sheet of expanded polystyrene to the exact width between the rafters, and push it in so that it fits tightly.
2. Hammer nails or tacks into the rafters below the sheets so that they protrude and prevent the sheets from dropping down.
3. Butt-join the polystyrene sheets whenever you need to use a new piece to make a joint.
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