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Old 10-15-2012, 08:40 AM   #1
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Tyvek, Generic House Wrap, Roofing Felt, or?


Did a few searches on this question but it seems most have specific issues for their project.

I have a project to replace a few windows in a 2x6 framed wall. Exterior is vinyl siding over 1x6 pine tongue and groove board.

From the pictures I have during initial construction, the only material over the T&G board is very thin (1/4" fan-fold) foam board. There is no type of house wrap.

A concern is air and moisture migration through the T&G seams.

How should the wall be covered?

Is Tyvek better than genric house wrap? Is 30 lb. roofing paper just as good?

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Old 10-15-2012, 09:48 AM   #2
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Tyvek, Generic House Wrap, Roofing Felt, or?


Is this going to be new constrution windows with nailing fins?
Unless you plan on removing all the siding on the whole wall there is no other wrap needed.

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Old 10-15-2012, 02:12 PM   #3
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Tyvek, Generic House Wrap, Roofing Felt, or?


I knew I would forget something important.

Yes, new construction windows with nailing fin. Old windows are replacement type. All the vinyl siding and what is underneath it will be removed to reframe for the new and larger windows.

This gives me the opportunity to seal the T&G wall properly. I can't imagine how much air infiltrates into the wall cavity through all those seams.
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Old 10-15-2012, 02:34 PM   #4
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Tyvek, Generic House Wrap, Roofing Felt, or?


I do not have a lot of experience with the vinyl siding and fan-fold insulation but I think I would recommend installing the house wrap directly over the 1x6 sheathing as your water drainage plain.
Then install windows with flashing in an approved manor, starting flashing form the bottom and overlapping as you go up.
then put up the fan-fold and the vinyl.
This way you keep the majority of water away from the sheathing and allow it to dry to inside and the outside.
I think the air infiltration is not such a big deal, you have drywall on the inside right? And insulation in the wall cavities?

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Last edited by AndyGump; 10-15-2012 at 02:36 PM.
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Old 10-15-2012, 03:49 PM   #5
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Tyvek, Generic House Wrap, Roofing Felt, or?


if your installing all new windows and siding its much better insurance to install new house wrap as well. if you want extra r-value to your walls install 1" extruded polystyrene foam alone without tyvek and your just as water tight with the foam alone provided its installed correctly
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Old 10-15-2012, 04:07 PM   #6
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Tyvek, Generic House Wrap, Roofing Felt, or?


I would recommend checking with your building department to determine if you are required to have a Rescue Escape and Rescue Opening in every bedroom, and if so what is the code requirement. Typically if you do not have to change the rough opening (in areas that have or enforce a building code) you are not required to ensure compliance with the requirement, but if reframing or enlarging an existing opening, or framing a new openings they must comply.

This link will provide you with the 2009 International Residential Code, Section 310 Emergency Escape and Rescue Opening.

This will provide you with the requirements.

Good luck!
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Old 10-15-2012, 07:58 PM   #7
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Tyvek, Generic House Wrap, Roofing Felt, or?


Thanks, I'll look into the escape requirements and added insulation.

At this point I'm more concerned about what's the best (not most expensive) material to cover the tongue and groove sheathing.

Does it need to be Dupont Tyvek or is generic house wrap equal? Is 30 lb roofing paper equal? I'm looking for the best way to weather tight the exterior.

With seams every six inches, there is a good chance of air infiltration into the wall cavity from the outside. There would be a whole lot less seams if the sheathing was 4x8 plywood.
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Old 10-16-2012, 12:40 AM   #8
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1. What type of cavity insulation?

2. Where are you located?

As Joe said, some fan-fold is rated as a WRB (water resistant barrier). Foam board without a WRB is risky, according to BSC.

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Old 10-16-2012, 01:25 AM   #9
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Tyvek, Generic House Wrap, Roofing Felt, or?


Your location is critical for how thick, if any, foam to put over the t&g. among other functions, the foam is to keep the exterior "sheathing" warm enough so condensation does not form on it. greenbuildingadvisor.com has an article something like "how much foam is enough" that you may want to read. were i tearing this all up, i'd put in 1x3 furring strips, over the wrb, as a rain screen, too. hang the siding on the furring strips.
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Old 10-16-2012, 10:55 AM   #10
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Tyvek, Generic House Wrap, Roofing Felt, or?


I would like to completely re-engineer all the walls correctly but .........

- House is in central N.C.

- Current wall cavity insulation is kraft faced fiber-glass. Not sure yet on thickness but probably standard for a 2x6 studded wall.


I suspect the fan-fold (1/4") foam board was to provide a flat nailing surface for the vinyl siding. Since I have to match up to the existing foam board, going thicker would be a problem.

Not sure I can justify stripping all the vinyl from a 40ft long wall even though that would be the best option.
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Old 10-16-2012, 11:04 AM   #11
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Tyvek, Generic House Wrap, Roofing Felt, or?


Quote:
Originally Posted by jklingel
Your location is critical for how thick, if any, foam to put over the t&g. among other functions, the foam is to keep the exterior "sheathing" warm enough so condensation does not form on it. greenbuildingadvisor.com has an article something like "how much foam is enough" that you may want to read. were i tearing this all up, i'd put in 1x3 furring strips, over the wrb, as a rain screen, too. hang the siding on the furring strips.
http://www.greenbuildingadvisor.com/...foam-sheathing
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Old 10-16-2012, 11:04 AM   #12
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Tyvek, Generic House Wrap, Roofing Felt, or?


If you can not take down the siding then how are you planning on sealing the T&G sheathing?

A better question may be 'why are you planning on sealing the T&G siding'?

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Old 10-16-2012, 12:36 PM   #13
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Tyvek, Generic House Wrap, Roofing Felt, or?


Quote:
Originally Posted by Pittsville View Post
Thanks for the link. I read them, but rarely keep them.
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Old 10-16-2012, 12:38 PM   #14
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Tyvek, Generic House Wrap, Roofing Felt, or?


Quote:
Originally Posted by Earnie View Post
I would like to completely re-engineer all the walls correctly but .........

Not sure I can justify stripping all the vinyl from a 40ft long wall even though that would be the best option.
Ernie: Fear not stripping the siding. I suspect you'll be happier doing it right. "Once is enough."
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Old 10-16-2012, 01:05 PM   #15
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Tyvek, Generic House Wrap, Roofing Felt, or?


Quote:
Originally Posted by AndyGump View Post
If you can not take down the siding then how are you planning on sealing the T&G sheathing?

A better question may be 'why are you planning on sealing the T&G siding'?

Andy.

I'm removing the siding where the new windows are going. Siding has to come off to frame the new windows.

Why wouldn't I want to seal the air gaps in the pine tongue and goove sheathing? This is not 4'x8' plywood. It's a 1"x6" with a probable air gap where the tongue meets the groove. You seal the seams in plywood sheathing don't you?

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