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Doug Crf 08-22-2006 01:53 PM

Replacing bad whirly turbin vent
On our grage we have a turbin vent that needs alot more wind to spin than most others in the nabior hood.
I want to replace it with a new one.
Is it fairly simple?
Also I would like to install one and replace an exsisting one on the house.
Wondering how hard it is to install one where there has never been one before.We have two layers of shingles on our roof.
If the ones that are up there are 12'' and I want to install 14'' does the hole need to be trimmed a little bigger?

AaronB 08-23-2006 06:44 PM

If you have a 14" dia. vent stack, cut the roofdeck hole 14". Then I would simply cut the shingles out to a 15" diameter half circle/horseshoe (this leaves 1/2" all around for good waterflow) and slip the vent into it.

Remove the roofng nails in the surrounding 2', and nail through the top of the flange at the edge and thene overlap the newly cut shingles over the flange.

Nail the loose shingles back down, but do not nail through the flange. If you nail the side shingles through the flange, then water running down around the vent upright will flow over your nailholes and leak.

Be careful not to cut too many courses of shingles on the bottom side, as it will leave you vulnerable. I also like to nail the bottom edge through the flange, but about an inch up from the edge and seal the nailheads with a matching aluminumized sealant (if a bare metal finish). a matching urethane, or a clear silicone.

Hope this helps. If you're not clear, ask.

MJW 08-24-2006 04:07 PM

You could just wait a few years till your second layer deteriorates and replace everything right.

The easy way is to just get a new spinning top for the bad one and leave the flshing in. Just make sure it is mounted straight, so rain can't get spun into the turbine.

AaronB 08-24-2006 05:16 PM

What is wrong with the stated?

MJW 08-24-2006 06:29 PM


Originally Posted by AaronB
What is wrong with the stated?

Nothing. I didn't mention anything about what you said. I was just giving an easy alternative. That's all.

One thing though. Why would you nail the bottom of the flange, but not the sides? Or am I interpreting wrong?

MJW 08-24-2006 06:31 PM

After I reread, what I meant by "right", is tearing off the old shingles, not a second layer, and replacing the vents all new instead of reusing them.

AaronB 08-24-2006 11:07 PM

I nail the bottom to hold the bottom down against winds, and seal the nail, which goes through a couple of shignle courses.

I do not nail the sides because water washing down around the vent will be blown over the nail hole through the vent flange. This does not get a sealant. I do not like to block up the free flow of water, and cannot have that hole there through the flange.

MJW 08-26-2006 12:48 PM

I have never seen a nial leak around any vent. I have seen turbines leak though because they were not installed straight up and down. If you watch one that is crooked in a rain storm, you can see rain come in a little at a time as it turns. We try not to install them. I would rather use another type of venting.

AaronB 08-27-2006 09:36 AM


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