Roof question for pros - 1914 home

sarah2008October 3, 2008

I have a 1914 small craftsman style house that needs a new roof. The contractor told me it does not have a ridge vent and he must install one (or corning won't guarantee the new shingles). I am wondering if it did fine all these years without a ridge vent if this is really necessary or the proper thing to do?

Thank you for information.

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For a ridgevent to have full effect, it has to coincide with continous run soffit/eave venting. What type of venting does it currently have. If you haven't had any moisture/sagging issues, i would think it would be fine left alone. A lot has to do with geographic location as to what is the proper venting techniques used on a home.

    Bookmark   October 3, 2008 at 5:21PM
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The Owens Corning warranty requires "adequate ventilation" but does not say how to achieve that. Generally meeting typical building code standards would be considered adequate. If the house has an attic and it is ventilated by end wall vents that meet the building code requirements you should be OK.

Contrary to manufacturers' self-serving claims ventilation has little if anything to do with the longevity of asphalt shingles so your only concern should be the warranty.

    Bookmark   October 3, 2008 at 10:52PM
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Is it acceptable to put shingles over top an existing roof if there is only one layer there already?

    Bookmark   October 15, 2008 at 3:55PM
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    Bookmark   October 15, 2008 at 10:50PM
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Depends on the condition of the old roof. It may also affect warranty of the shingles being installed.

    Bookmark   October 16, 2008 at 2:21PM
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