Felt Roofing?
Hi,
I have a flat garage roof that has started to leak. It currently has chipboard beneath the felt, which has started to expand and rot. So I need to totally replace the roof, replacing chipboard with 18mm WBP ply, then 3 layers of felt (2 underlay 1 top) Now my question is, the 1st layer of underlay, should I nail it to the ply boards, stick it, or leave it free moving. I read this website http://www.diydata.com/projects/flatroof/flatroof.htm that says to nail the felt every 6" (using proper felt roofing nails), however I was talking to our 2 builders/maintenance contractors at work and they said if you nail it, when the felt expands, it rips, so you should just lay it on, and not nail/stick it. Who is right? Any help greatly appreciated! Cheers Ben "Thanks to God, I am Still an Atheist" |
Never, ever, nail felt! This makes holes in it, unsurprisingly. It should be
stuck using the appropriate adhesive which should be laid in stripes up and down the roof at, say 1 foot intervals. If you plaster the whole roof with adhesive it is likely that when the felt gets holes in it the rain water will gather, unable to get out by gravity, whereas with 'vertical' glue the water, if any penetrates the felt, will run out to the gutter. The you glue a top sheet on top. Rob Graham |
I've used cheapo felt and good felt, and I'd always use the best if the
money's there. Its a small difference to pay to make the roof last twice as long. I've never tried fibreglass resin roofing, but have heard its much better, might be worth looking into. NT |
|
Its rigid, so its a wet lay job.
NT |
grp has two layers the top layer being a coloured gel coat 100%
water/weather proof. |
Quote:
I beg to differ with your above comment. I understand why you would say this, as old traditional felts could be seen as being the 'VCR' of flat roofing. However, new modern high performance polyester roofing felt membranes are so advanced these days, that most are guaranteed for 20 years but will last for in excess of 30 years at a smaller cost to that of rival materials such as GRP or EPDM (Rubber). These high performance modified membranes are the 'Blue Ray' of flat roofing! If i can be of any further advise please let me know. I know my view is a bit biased as i work for a roofing felt manufacturer but i have seen a few roofs with all materials on, and i wouldn't be working for who i do if i didn't believe in what i was selling. Mat Holland |
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