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Application of material for detailed areas for GRP Roofing
(up-stands, trims etc.)

Preparation and time spent at this stage of the GRP roofing proceedings ensures a good end result.
 
  • Avoid spillages by masking off the roof
  • A fine spray is caused by the consolidator roller and can be carried by the wind, it is important to consider this before the resin is used. Remember, when resin has cured, there is no easy way to remove it
  • GRP roofing resin is supplied in tins of 10kg and 20kg
  • Mixing buckets are graduated in litres to allow easy calculation of the amount of catalyst/hardener needed
  • To remove the lid from the tin, use a 4-6 inch nail to bend back the tin’s lugs. It is very important to stir the resin before use
  • Prepare enough tins of resin to complete the day’s laminating, as mistakes such as unmixed resin are difficult to rectify later
  • The resin to CSM ratio is 1.35kg of resin for every
  • m2 of glass. (Allow 1.5kg for every 1m2 for wastage and difficult details)
  • To start, mix a small quantity of resin (1 or 2 litres) to laminate the corners and bandage the trims. This will give the best indication of the curing time and if the right amount of catalyst has been added to the mix
  • Curing times should be between 20 to 30 minutes for best results
  • Before laying out the chopped strand mat, the deck must be clean and dry, with all the trims fixed in place
  • The mat has a cut edge and a feathered edge. Always overlap the feathered edge over the cut edge
  • The mat is usually laid parallel to the drip trim
  • Start by rolling the mat out, overlapping the trim by at least 50mm, but not over the edge. Leave the ends long at this stage
  • Roll out each 1m strip overlapping each time by at least 50mm across the roof. The ends can then be cut off, into the corner of the trim, to leave a neat edge
  • Decide on the best place to finish laminating the roof and roll the mat up to the furthest point from the ladder
  • Cut 200mm squares of mat for each corner and 200mm strips of bandage for each joint. Corner squares should be “wet out” on both sides with well mixed catalyst and placed onto the face of the corner, then folded around the corner and over the top of the trim, down onto the deck. Any joint in the trims should be bandaged using the same mix of resin and the same technique as the corners
  • The deck of the roof can be laminated before the corners and bandages have cured
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