TOPIC: I Have An Existing Metal Roof and Have A Question
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We recently moved into our home. It is a family home that has experienced a moderate amount of neglect and needs repairs. When we moved in it was summer/fall and the roof was leaking in several areas like Swiss cheese. Having a shortage of “slush funds” at the time meant an temporary solution. We installed brown aluminum roofing over existing 2 layers of shingles. Only in the areas where we were experiencing leaks. However while doing demo in one of the effected rooms we can now see the roof deck is saturated to the point of dripping under these areas. The house is a one level ranch with crawl space, all HVAC and plumbing are in the attic space. All ventilation for bathroom vents out roof. 4/12 pitch with no ventilation in attic. No ridge vent, no soffit vents and no eve vents. There is rolled fiberglass insulation, no vapor barrier. We were planning to do the whole roof when the weather breaks but fear metal roofing might not be the correct option?
It sounds like you have a lot of roof work ahead of you including removing the existing roofing and probably even replacing some of the decking. For a healthy and energy efficient home, I would encourage you to add intake and exhaust vents with the new roof. If that cannot be done, there is a chance that a metal roof could be the "straw that breaks the camel's back," causing condensation in the attic that would not otherwise be there.
Sounds like a full deck removal as well as an impacted insulation.
The roof may not have been ventilated from the outset, but ventilation can often be added as long as you allow for it to be continuous and balanced.
Definitely sounds like you have some projecting ahead of your, but if you come up with a plan to follow...you can get it done.
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