Beginning with the width of the roof you will need to add an extra 50 75mm at both the front and back of the roof behind the barge boards.
Mastic for roofing felt.
Generally speaking roof mastics are sticky drying to a flexible rubbery finish after they are applied and allowed to cure.
Lay out the felt on a flat surface and measure out the desired width using the lap joint as a reference point to keep your measurements level.
Several different kinds of products are referred to as mastic.
Cover all nail heads with roofing mastic for long term roofing.
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Rose roofing green heavy duty shed roofing felt 25 year life expectancy including nails and adhesive 10m x 1m.
Ikopro high performance felt lap adhesive is a general purpose bitumen adhesive to seal overlaps on roofing felt and shingles.
The bostik cementone feltfix bituminous roof felt adhesive is a solvent based bitumen product designed for bonding roof felt to various roofing materials including existing roof felt concrete and metalwork.
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One form of roof mastic is a sealer or cement that is used on any area of the roof where water infiltration could occur such as along the edges of the flashing at seams and corners and over nails and screws.
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It can also be used for bonding mineral chipping to bitumen surfaces.
If this felt is more than a temporary waterproofing measure apply roofing mastic using a caulking gun.
Hold the gun at a 45 degree angle with the nozzle pointed downwards.
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Roof mastic is a roofing product used to seal a roof so water cannot penetrate.
Pull the trigger of the gun and move the nozzle around the circumference of each nail.
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It can come in buckets allowing people to apply it with a palette knife or in tubes that can be fitted into a caulking gun.