High Water Table = Shorter Roof Life? - Roofing - Contractor Talk

High Water Table = Shorter Roof Life?

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Old 12-17-2007, 11:48 PM   #1
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High Water Table = Shorter Roof Life?

There's a few subdivisions built in the 70's around here with high water tables so all the homes are built on slabs. An experianced roofer (36 yrs) working for me has speculated that the roofs and the plywood are failing quicker because of this. He has seen these homes re-roofed on average 10-12yrs. The ventilation and insulation have been improved, at least on the ones he's worked on, so it does have me wondering. I could see were subpar vapor barriers in these old slabs or the humid air drawn into the attic would contribute to the problem. Have any of you noticed this and is there any data or studies done on these conditions?
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Old 12-18-2007, 07:11 AM   #2
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Re: High Water Table = Shorter Roof Life?

No clue. But I've seen so many early failures, I only expect, and tell my clients, to only expect 1/2 the life spec'd on the bundles. Some roofs do make it, but a lot don't.


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Old 12-26-2007, 02:09 PM   #3
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Re: High Water Table = Shorter Roof Life?

All depends on each home. Could have an issue where the air leaving the home and coming in the home is increasing the humidy levels causing the roofs to decay. If you can solve or decrease the amount of air coming and leaving the home you should eliminate the roof related issues you see in these homes.

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Old 12-26-2007, 05:31 PM   #4
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Re: High Water Table = Shorter Roof Life?

What do you mean by stack pressures? Explain further if you could.
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Old 12-26-2007, 08:18 PM   #5
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Re: High Water Table = Shorter Roof Life?

Stack pressure is the natural effect of warm air rising and cold air falling. The only real reason any roof should fail is lack of ventilation from extreme cooling, drying and temperatures difference on opposite sides of the plywood surface. However no one holds a receipt for 20yrs on a roof for one thing and it will look like hell by then anyhow. I can say I have seen asphalt shingles last beyond 20yr on occassion too. The shoddy work pumped out in developments at any time in history is no help. Even today many framers continue to leave no space for plywood seams as the dimensional lumber shrinks the plywood buckles and breaks the shingles.
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