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-   -   ice and water shield (http://www.diychatroom.com/f9/ice-water-shield-182322/)

markharmon 06-23-2013 10:17 AM

ice and water shield
 
Does ice and water shield need to be adhered directly to the roof sheathing or can it go over the felt?

tinner666 06-23-2013 10:22 AM

It's supposed to be adhered to the wood deck. Then, in 10 years of so when the new 'lifetime' shingles need to be replaced, you also replace the wood even though they say you can add more layers of the stuff.

Windows on Wash 06-23-2013 10:41 AM

Quote:

Originally Posted by tinner666 (Post 1205886)
It's supposed to be adhered to the wood deck. Then, in 10 years of so when the new 'lifetime' shingles need to be replaced, you also replace the wood even though they say you can add more layers of the stuff.

:laughing::laughing::laughing:

What...you don't think they will last a lifetime?? :whistling2:

tinner666 06-23-2013 10:49 AM

Especially not after working on two this week installed around 2003.

markharmon 06-23-2013 12:14 PM

Quote:

Originally Posted by tinner666 (Post 1205886)
It's supposed to be adhered to the wood deck. Then, in 10 years of so when the new 'lifetime' shingles need to be replaced, you also replace the wood even though they say you can add more layers of the stuff.

So for using ice and water as a flashing back up for a dormer I should attach it to directly to the sheathing?

tinner666 06-23-2013 12:34 PM

That's what they say on the package.

tinner666 06-23-2013 12:46 PM

BTW, keep in mind that if it isn't 100% tight as possible and creased as neatly as possible, the flashing won't fit tightly to each other, or the wall either causing gaps that WILL rely on the I&W to keep water out.

MTN REMODEL LLC 06-23-2013 02:21 PM

Definately adheared to the sheathing.

It is a barrier, and will not breathe. If moisture gets under it, you will rot your sheathing. And it should be well adheared and neatly laid.

RWolff 06-23-2013 08:11 PM

I used Tamko moisture guard over my entire roof, installed directly to the plywood since it has a fly paper like super sticky glue backing. I don't think you need felt anyway. The black tar paper stuff is mostly to protect things while working in case there's a rain event, as can be imagined that paper tears super easy and nails just put holes in it.

markharmon 06-23-2013 08:15 PM

Quote:

Originally Posted by MTN REMODEL LLC (Post 1205998)
Definately adheared to the sheathing.

It is a barrier, and will not breathe. If moisture gets under it, you will rot your sheathing. And it should be well adheared and neatly laid.

That's what I figured to and some roofer I spoke to said to run it up the dormer walls, which I understand, then have it overlap the felt on the roof deck. Also, when you install a typical square top roof vent and you cut a hole in the roof to install you fasten it directly to the sheathing to, right? I was told to put some sealant on the bottom of the vent.

Windows on Wash 06-24-2013 06:41 AM

Nascar likes it so it can't be that bad.

http://media.caranddriver.com/images...s-1280x782.jpg

tinner666 06-24-2013 08:01 AM

1 Attachment(s)
DO NOT put sealant at the bottom of the vent! Here's a pic of one done that way. It split the shingles.

If you're in hurricane country, you can put abead of sealant around the lower 2/3 of the hole when you set the vent. Pass the hole with the top of a shingle before the vent goes on.

http://www.albertsroofing.com/Power%...stallation.htm

markharmon 06-24-2013 09:00 AM

Quote:

Originally Posted by tinner666 (Post 1206334)
DO NOT put sealant at the bottom of the vent! Here's a pic of one done that way. It split the shingles.

If you're in hurricane country, you can put abead of sealant around the lower 2/3 of the hole when you set the vent. Pass the hole with the top of a shingle before the vent goes on.

http://www.albertsroofing.com/Power%...stallation.htm

The vent goes directly over the roof sheathing, right?

markharmon 06-24-2013 12:10 PM

When you install the flashing for the dormer you overlap the housewrap over the step flashing, correct? Do you tape the housewrap or leave open at bottom so as to not trap water if it gets behind? When I side the dormer the j channel is going to run along the flashing on the wall side so is it ok for the J channel to be nailed right over the step flashing?

tinner666 06-24-2013 04:12 PM

Quote:

Originally Posted by markharmon (Post 1206345)
The vent goes directly over the roof sheathing, right?

Only if you want it to leak.:yes:


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