I take it that the topcoat has UV protector within it to prevent sunlight degradation?
Very useful post roy - I've never actually seen a GF roof. Would love to know more - can you recommend a site or a book to peruse, if you've got time? If not, then thanks for the info provided anyway, definitely food for thought.
Thanks for your comments lads I will sort out the invoice for the materials Joe but we are only talking of about 10 metres in length and the widest part being the top of the parapet. As for the ply we could only use half inch WBP ply as we were govered by the height of the abutting gutters and the profile. We fixed it down with stick likes s### and plugged and screwed it. We used two layers on the profile of the parapet and in the gutter, most roofers use only one lay up and that is usually enough. As for the life of the roof I couldn't say as I have not seen any fail yet. I would not normally take on any fibre-glassing but I was annoyed at this so called mate giving me such an high quote so thats why I did it. I did a lot of fibre glassing in Guernsey in the 80's (making "OG" gutters in 3metre moulds,) then we used to use what we called a 2 ounce lay up which was 2 layers of matting. Also I replaced a lot of parapet gutters with glass after the wooden gutters had been destroyed by dry-rot when the old lead had failed.
list of materials
15 metres of "450" matting
1x20kg.GFSResin
1x5kg Topcoat
1x3 ltr. acetone
1x500ml. catylist
rollers
gloves
brushes
buckets.....
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