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Thread: Can a Roof Burst from Inside?

  1. #1 Can a Roof Burst from Inside? 
    Time Lord zinjanthropos's Avatar
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    Here’s a weird one. The other night we had a big storm, high winds and buckets of rain. In the morning I noticed few shingles on roof from peak seams. Turns out that along two peak seams I could see small opening where two plywood sheets come together. No water noticed inside home but where the shingles had popped it looked as if they had been forced out from inside. While on my roof I noticed that my neighbour's roof had exactly the same thing along two peak seams. My roof 8 yrs old and hers 1. Her house only 15 feet away.

    I talked to her repair guy and he said he’d never seen such a thing. Is it possible that air pressure inside both attics was greater than that of the outside if only for a moment, long enough to pop a shingle off a weak spot along peak seam? (where plywood sheets meet there is small opening to attic). Wouldn’t think so since there are roof vents.


    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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  3. #2  
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    Seems like it would be more surprising if they didn't come off. Those storms are something else and the pressure they apply very uneven.

    Still I think the wind must have prised them off from the outside surely if they were the tiniest bit loose in the first place.

    I have heavy Bangor slates two of which I have actually just glued together as a pair along the join (some 15 years ago) and am amazed not to have lost a slate over the years.

    Our attic would be fairly open to the elements too.

    I wonder if we will be getting any ex hurricanes this year (shivers, they are showing up further and further east in the Atlantic)


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  4. #3  
    Time Lord zinjanthropos's Avatar
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    Quote Originally Posted by geordief View Post
    Seems like it would be more surprising if they didn't come off. Those storms are something else and the pressure they apply very uneven.

    Still I think the wind must have prised them off from the outside surely if they were the tiniest bit loose in the first place.

    I have heavy Bangor slates two of which I have actually just glued together as a pair along the join (some 15 years ago) and am amazed not to have lost a slate over the years.

    Our attic would be fairly open to the elements too.

    I wonder if we will be getting any ex hurricanes this year (shivers, they are showing up further and further east in the Atlantic)
    I had no problems for 8 years and the biggest surprise was that my neighbours 1 year old roof peaks did exactly as mine. These are tar shingles. I even thought something solid might have impacted those peaks as it rolled across roof but found no evidence of anything. If there was big hail then I slept through it. Can’t find a roofer to do repair these days so I used some tar roof patch caulking, found the torn off pieces and jigsaw puzzled them back together, used some nails, caulked nail heads and where shingles tore and hoping for the best.
    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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  5. #4  
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    Simple explanation: High winds plus low pressure outside house.
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