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Question DetailsAsked on 1/26/2014

The edge of my roof on the backside of my modular home is rotted. About 13 inches from the edge.

I got on my roof to do a yearly inspection and noticed that the edge of my roof(about 13 inches from the edge) is rotted. The shingles look fine but I stepped on the edge and it was soft. I pulled the shingles up and noticed the rotted wood. I know I can replace the plywood and shingles but I don't know what's causing it. I hate to replace everything to just do it again later. And advice will be very appreciated. I have gutters and drip edge. I just added a lean to to that side of the house but I don't think that would have any effect. Thank you

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2 Answers


Can you post up a picture as well as tell us what part of the country you are in?

Is there Ice/Water on the roof?

Any plumbing vents or penetrations above the rotted area? Is the rot consistent across the back at that 13" mark?

If the lean to isn't on the roof surface, it shouldn't have any impact.

Answered 6 years ago by WoWHomeSolutions


Since rotted, your decision is simple - pull off shingles from the rotted area sideways and uphill until you expose all the rotted sheathing (which needs to be replaced) plus extend to the next rafter on each side, and next seam uphill. All that sheathing should go. Then chase the shingle removal uphill till the leak is found - or if the staining/wetness just dies out near the edge in a few feet, then stops there.

Could be a leak uproof (likely at a penetration unless you are near a valley), running down under the shingles and probably under the water barrier and soaking the lower section of the sheathing.

Second possibility is excessive moisture buildup and poor ventilation rotting the sheathing from the bottom with condensation and frost buildup - check out the underside of the sheathing in the attic for delamination, splintering, and rot and water staining.

Third possibility, if you have soffits, is they are restricting ventilation and causing moisture buildup in the soffit/fascia area which is rotting out the shething from underneath.

Fourth possibility, especially you added a lean-to right below the affected area, is it caused backup at the fascia or ice damming (if you have snow) as the water came down to the edge and got stopped by ice and snow buildup on the shed. Another possibility, if the lean-to reaches to the house and is close under the roof, is it blocked airflow up through the eaves, allowing moisture buildup there and up through those rafter bays.

Fifth possibility, which should be easy to check - icing and gutter damming causing overflow over the back of the gutter, saturating and rotting the fascia, which then spread up into the sheathing.

One question about the 13" number - it suspiciously sounds like maybe there was a foot wide strip of ice and water shield along the edge of the roof, and the rot started right uphill of that ? Which would indicate water source could be uphill of there, or due to ice damming water got through the shingles right about there, but ran over the lower foot where the ice and ewater shield protected it, maybe ?

Since it sounds like this will be a do it yourself repair, a couple of suggestions - bite the bullet for the extra hundred or so $ and put ice and ewater shield to at least 3 and prefereably (if in snow country) 6 feet up all along the eave edge, making sure drip edge underlies the ice and water shield and causes drips to fall into the gutter rather than behind it - commonly requires larger size drip edge. Also, do not use any sheathing (or leave any on roof) less than a full quarter sheet (I try to avoid using less than half sheets), so it covers at a minimum 2 feet uphill-downhill, and at a bare minimum bridges across 3 rafters - 4 feet wide minimum. That will reduce tendency to cup and curl, and also gives enough support to carry your weight. Remember to leave 1/8" clear all around sheet for expansion when you put it in, otherwise it will buckle.

Answered 6 years ago by LCD

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