hello, we recently changed the flat alsphalt roof with GRP system. the builder used OSB 3 but not T and G. He also did not apply bandage inbetween the joints. However, he applied two times resin on top of laminate/mat and three times topcoat (he sanded every time he applied the coat). will it cause any problems in the future. what better to be done in order to prevent any problems?
GRP roofing
- Thread starter refurb51
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Hi that sounds ok but i will be using this way as they show here
http://www.glasplies.co.uk/Roofing-Information-s/1873.htm
i think it would depend on what topcoat he used.
aslong as he gave a coat of resin onto the OSB before he laid the fibreglass, if not it will not bind to the OSB and come/peel off very soon. that is the main part of laminating really.
http://www.glasplies.co.uk/Roofing-Information-s/1873.htm
i think it would depend on what topcoat he used.
aslong as he gave a coat of resin onto the OSB before he laid the fibreglass, if not it will not bind to the OSB and come/peel off very soon. that is the main part of laminating really.
It would of been best to as i normally do when i do similar jobs, but never done a roof yet. there is still a joint in either TnG or butt joint. how many laminations did he do? and what thickness?
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He basically put Osb, then resin then matting ( no bandage ) then resin, when it dried he sand it , then applied resin again. Then when it dried sanded it applied topcoat. When topcoat was dry he sanded it and applied topcoat. Then sanded it when it dried and applied topcoat again.
never heard of that way to laminate, i could be wrong though, if you add enough resin to the base, then matt then roll in more resin that should do, not to let dry then add more resin, unless your late and the first lot sets then you need to add more matt.
Dont sound right but if it works and you have a guarantee for his work.
wait for more replies as i am not fully up on roofing in GRP.
Dont sound right but if it works and you have a guarantee for his work.
wait for more replies as i am not fully up on roofing in GRP.
Maybe you should post in roofing section. 
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Yes it should of been bandaged and only one top coat
With OSB (non T & G) an expansion gap should be left, the purpose of the bandage is simply to stop the resin dripping through the expansion gap. It certainly sounds like he hasn't skimped on the number of coats, does it look like a tidy job?
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Deleted2797112
It might have, 6 years ago.
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dontbelieveawordofit
6 year old post.
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dontbelieveawordofit
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