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Old 11-05-2013, 09:12 PM   #41
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Originally Posted by happy2bretired View Post
If the dark streaking is mold, would covering it up with a new metal roof cause problems on down the line? Also, if the metal roof is installed over existing shingles, how can the condition of the actual wood under the shingles be inspected for any damage or deterioration?
Originally Posted by HFWR View Post
Maybe it's just me, but I would never do a roof-over. I want my new roof on solid decking.
Roof-overs are standard with regular shingles. One roof-over, then a tear-off the next time. Doing a tear-off pretty much doubles the cost, and isn't necessary unless a problem is detected.

I don't know if they put metal over asphalt shingles. I'm just guessing here, but if they do roof over the shingles I don't think the mold will be an issued. It's all outside. You can check the condition of the sheathing from the inside, but an experienced roofer can tell a lot just by looking at the condition of the existing shingles. By the way, my brother was a roofer, and I helped him on side jobs a couple times. Not enough to make me an expert, just enough to be dangerous if you listen to my opinion.

Also, just fyi, they have fungicide sprays that can be applied to the black streaks and shingles. I've read fairly good things about the results.

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Old 11-05-2013, 09:31 PM   #42
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Originally Posted by omni550 View Post
How do they handle existing roof vents (ridge vents, box-style roof vents and bathroom fan exhaust vents) when installing metal roofs?

At least for plumbing air vents they just penetrate the roof as if it was asphalt. Power vents can sometimes be reused as well.

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Old 11-05-2013, 10:47 PM   #43
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Originally Posted by Nodak View Post
The venting is usually handled with a steel ridge vent.
That is what mine had also.
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Old 11-06-2013, 03:24 AM   #44
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Mulligan, Thanks for starting the post and the reply to my questions. I thought about a metal roof before I went the less expensive route with shingle 13 years ago. I think "biting the bullet" and having the metal installed would have been a wiser choice. It would have been the last time we reroofed.

I live 2 blocks from the ocean in Fl. so wind can be a concern sometimes. I thought maybe a northeastern or mild hurricane this season would have the insurance company help with the expense. At least is gives me 7 months to research before next season. It appears that standing seam would be the prefered design for us so the cost will be higher than other designs. The thicker guage metal will also add to the cost.


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