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SophieC
roof sealing

Can anyone suggest to me what the best product is for sealing any vent pipe that goes through your roof?

MLB Construction
Re: roof sealing

a rubber boot with a metal flange. only costs about $15

HoustonRemodeler
Re: roof sealing

Flat roof or pitched roof?

A. Spruce
Re: roof sealing

What type of roof, is there flashing around this vent pipe already?

dj1
Re: roof sealing
MLB Construction wrote:

a rubber boot with a metal flange. only costs about $15

These are the best!

SophieC
Re: roof sealing
MLB Construction wrote:

a rubber boot with a metal flange. only costs about $15

I know it is not a rubber boot. I have one of those on the plastic vent pipe that goes through my roof.

HoustonRemodeler wrote:

Flat roof or pitched roof?

Pitched roof.

A. Spruce wrote:

What type of roof, is there flashing around this vent pipe already?

Standing seam metal roof. Guess I should have given more info......this is a stainless steel double wall vent pipe for a gas tankless water heater. There is some type of special flashing thing I had to purchase. But it is leaking.

HoustonRemodeler
Re: roof sealing

Yes, the manufacturer of the pipe will have a stainless steel flange for your roof.

Granted you'll be crying when you hear the price, but that is what you'll need.

dj1
Re: roof sealing

"Standing seam metal roof. Guess I should have given more info......this is a stainless steel double wall vent pipe for a gas tankless water heater. There is some type of special flashing thing I had to purchase. But it is leaking"

Sophie, you ended up putting a metal roof? all along I thought that you were going with shingles.

SophieC
Re: roof sealing
HoustonRemodeler wrote:

Yes, the manufacturer of the pipe will have a stainless steel flange for your roof.

Granted you'll be crying when you hear the price, but that is what you'll need.

It is what it is! LOL Didn't cry....already have it....bought it back 2 years ago and it is already installed.....has been up there for almost 2 years now.

dj1 wrote:

"Standing seam metal roof. Guess I should have given more info......this is a stainless steel double wall vent pipe for a gas tankless water heater. There is some type of special flashing thing I had to purchase. But it is leaking"

Sophie, you ended up putting a metal roof? all along I thought that you were going with shingles.

Yes, dj......I never had any intention of putting a shingle roof on my house. I always said if I ever had to remove those concrete tiles from my roof I would go with a standing seam metal roof.....and I did. :)

With that being said......what type of sealant should be used? I think the plumber that installed it used a simple caulk, since he mentioned to me that it doesn't last and will eventually break down. Well, why did you use that?! Anyway, he asked me if I had some silicone to put up there. He's been scheduled to come by and seal it again a couple times and has been a no show. It is one of those situations where "if you want something done right, do it yourself".

HoustonRemodeler
Re: roof sealing

Silane or urethane caulks are best. You might need backer rod or foam to not have huge goobers of caulk.

Mastercarpentry
Re: roof sealing

One of the problems I have with most metal roofs is that there is no way to seal penetrations so that they will not leak in the event of a caulking or sealing failure :( Only with copper roofs can boots be soldered making for a permanent seal, all the rest are going to require that you inspect and maintain as needed. Generally, a phone call to the manufacturer will get you an answer on what is best, as they don't want you to have any problem with their products ever. They want you to sell their next roof so they will give you the right advice and it will meet any warranty obligations they may have. And as for me, when it comes to anything that is really important like roof boots or my truck's brakes and steering, if it is going to be done I want to be the one to do it so I will know it was done right; too much to lose if it isn't :cool:

Phil

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