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Question DetailsAsked on 3/12/2016

The roofer suggested to instal torch down roof over existing shingles. The slope is 1/2" on 12". Is he right?

This is a low-slope roof. The first roofer made a mistake: installed shingles. The roof is leaking. The second roofer suggested NOT to remove shingles and install torch down over them and apply silicon coating over torch down. Is this a right way to do the flat roof?

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1 Answer


Wow - you seem to have bad luck finding good roofers. My recommendation - Search the List for A rated and well-reviewed roofers to find a competent one, because in my opinion both of these were out of left field.

Depending on how long it has been since the first roof was done, and if still under installer warranty, you may have a potential basis for a lawsuit or a claim against him with his bonding company to pay for a replacement, because shingles on a 1/2:12 slope is a total fail unless shingles were SPECIFICALLY called for by the owner or architect AND very exceptional measures are take witth the underlayment for waterproofing, because at that slope the shingles would be only an architectural feature for looks, NOT a valid "roofing" material. Even with special care on waterproofing, leak potential would still be higher than normal, because putting on shingles involves punching the waterproof membrane full of nail or staple holes.

The second one - total fail too, unless you intend to set up a web video on the ugliest roofing job and sell ads per view, because it will be uneven, rolling, creased, fail prematurely, and almost certainly crack the first time it is walked on. NOT the way to do it.

Here are a couple of previous questions with answers on low-slope roof options:

Your options are listed in those links - certainly raised-seam gasketed steel roofing is likely to be the best long-term performer (though more expensive).

Another option (at significant added cost), if you intend to live in this house "forever" would be redoing the roof framing to increase the slope to say 4:12 or steeper to allow use of shingles - possibly as part of a remodel to increase square footage by converting some or all of the attic to living space.

Answered 3 years ago by LCD

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