Opiniões sobre Bostik Bituminous Mastic for Waterproofing Roofs - 2.5L

Bostik Bituminous Mastic for Waterproofing Roofs - 2.5L Bostik Bituminous Mastic For Roofs is a multi-purpose trowel grade bituminous material for waterproofing, stopping, bedding, pointing and sealing. It can be applied to mastic asphalt, roofing felt, currugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber. It dries to a flexible black material which remains soft and pliable for a long time after application. Size: 2.5L   (Available in sizes 1.2L and 2.5L) Preparation: Bostik Bituminous Mastic For Roofs must only be applied to surfaces that are completely dry. Ensure that when applied to bitumen felt no moisture is contained within the felt. Ensure the roof surface is structurally sound, clean, dry and free from surface contaminents such as grease, oil, dirt and loose materials. Remove any organic growth i.e. moss or lichen with Fungicidal Wash. If the surface is either dusty after cleaning, or covered with weathered bitumen, prime with Bostik Penetration Primer for Roofs and allow to dry. To assist application in cold weather , store the amterial in a warm room overnight prior to use. Application: Apply with a steel trowel or putty knife. Crack / holes: Force Bostik Bituminous Mastic into the cracks, covering over the area to be treated by 25mm either side, at a thickness of 3mm. For large cracks and holes apply over areas to be treated and embed a closely woven glass fibre membrane into the compound to overlap the crack or hole by approx 50mm. Allow to dry and then apply a second coat, fully covering the reinforcing membrane. Corrugated iron / fibre cement sheeting: Tighten loose hook bolts and trowel around with Bostik Bituminous Mastic. Remove loose screws then rebed screws and washers in Bostik Bituminous Mastic and tighten; top seal and trowel to a smooth finish. If a sheet is cracked: clean, prime and apply a bandage with a strip of woven glass membrane embedded in Bostik Bituminous Mastic. Allow to dry, then overcoat. Where it is required to seal side and end laps in corrugated sheeting use the same technique. Tiles: Point up butt ends of ridge tiles, fillets and slates with Bostik Bituminous Mastic. Lead and Zinc: Trowel over cracks and pinholes, where necessary reinforcing with a fully embedded and covered woven glass membrane. Felt: Re-adhere loose felt especially flashings and details, then seal joints with Bostik Bituminous Mastic.