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Old 12-19-2017, 04:24 PM   #1
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Repairing leaky metal roof

The roof above a sun porch on a house I own has a small leak. The house was built in the 1890s and the roof is metal, and possibly original to the house. I assume it's tin, although it may be a different metal.

The leak appears to be the result of some small pinholes scattered around the edge of the roof.

My question is how you repair this permanently. I gather that a well maintained metal roof -- which means one that is regularly recoated with roofing cement -- should last indefinitely. So, before shelling out a fair amount of money to have the existing roof torn up and replaced with new metal, I'm inclined to spend more like $100 giving it a new layer of roofing cement.

But if the problem is likely to recur, then I'd rather fix it the right way -- or at least in a way that will last for many years. It's a rental property and I don't want to count on the tenants to report any new leaks, because they might not tell me until the problem has gotten pretty bad.

So, what do I do: Recoat the roof or hire someone to tear it off and replace the metal? Or is there another solution? Cost is important so I'm looking for a solution that will be cost-effective but not just a band-aid patch.

The roof is basically flat, by the way.
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Old 12-19-2017, 04:53 PM   #2
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Re: Repairing leaky metal roof

Needs a thorough inspection for signs of rusting, Many pinholes sounds like a possible rusted out sheet.

If so, no amount of tar is going to help.

You know the real answer, so just bite the bullet and replace it.

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Old 12-19-2017, 05:00 PM   #3
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Re: Repairing leaky metal roof

You really need a trusted pro to look at it and give you advice, Almost flat does not sound like a good place for a metal roof.
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Old 12-19-2017, 05:02 PM   #4
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Re: Repairing leaky metal roof

Is the year a typo?

1890 or 1980 ???

If 1890 is correct, you have received good value for the roof. Time to replace it.
Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. --- Quoted from lenaitch
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Old 12-19-2017, 05:54 PM   #5
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Re: Repairing leaky metal roof

Not one picture in the post.
We can not see what your seeing.
What type metal roofing?
There's at least 7 different types.
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Old 12-20-2017, 06:56 AM   #6
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Re: Repairing leaky metal roof

You can repair an ancient roof until you get tired of it and decide to replace it. Only you knows where that threshold is.
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