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06-07-2014, 08:11 PM #1
Asphalt flat roof with brown "stains."
Hi, hope someone has run into this before. This roof is a mess. From inadequate drains and drainage, alligatoring, completely soft (every step I took left a boot print), and curious of all is the asphalt seems to be turning or stained brown. The homeowner says it was re-roofed two years ago.
If it was only against the house I might be able to narrow it down, but it's random all over the place. Maybe stains from foliage? Any help would be greatly appreciated. Thank you.
Sincerely,
Nate
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06-07-2014, 09:39 PM #2
Re: Asphalt flat roof with brown "stains."
The roofing job appears marginal, at best, with variations in aggregate application and some hefty bird-baths. But I suspect the brown stains are the result of a combination of siding run-off and excess heat build-up from sunlight reflecting off the siding, possibly made worse by shallow cover over galvanized flashing underneath.
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06-07-2014, 09:44 PM #3
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06-08-2014, 05:22 PM #4
Re: Asphalt flat roof with brown "stains."
From my view of the photo - it appears that the general roof area was recoated with an asphalt based sealer. The brown spots may be evidenced of the older original deteriorating roof edge at the roof-wall junction.
Again based on your comments of your boots sinking into the coating, I have experienced similar conditions on recoated roofs where the lower original substrate is loose roof stone.
My take - it experienced previous roof leaks, hence the recoating. Just a temporary patch at best.
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06-09-2014, 09:35 AM #5
Re: Asphalt flat roof with brown "stains."
Nate, this looks like nothing more than a gravel surfaced built-up roof that was swept of loose gravel and had liquid roof coating poured on it. This is sometimes passed off to unsuspecting homeowners as a "reroof". The brownish colored areas probably don't mean much either way.
Don Putnam
www.roofconsulting.com
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