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Rigid Insulation

 
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Old 04-10-2013, 01:59 PM   #41
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Re: Rigid Insulation


Anybody else have a jurisdiction that is requiring them to put rigid insulation over sheathing when framing exterior walls with 2x4? IRC 2006 requires R-18 in my neck of the woods and officials are now enforcing it.. I think its a waste of money, but wont complain because it is code. Just going to amount to another $1g out of my pocket and will try to recoup it in the sale of the house. Next house, I will just use 2x6 walls and R19 insulation. Not a big deal, but kind of annoyed with this newly enforced requirement.
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Old 04-11-2013, 03:14 PM   #42
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Re: Rigid Insulation


Quote:
Originally Posted by buddy110 View Post
I agree with Mike. Styrofoam on the outside of a wall is next to useless. It's a leveling board and that's it.

I love the guys who sell contour foam as a way to save energyIt's a joke. There's one reason to use PF backed siding. Rigidity
you need to get a little more education. Ever hear of thermal bridging.
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Old 04-11-2013, 06:01 PM   #43
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Re: Rigid Insulation


Black95 - Why did you have to resurrect this thread? Just wait the newer codes get better for you (you are in Zone 6)


As for Tyvek over or under foam - as Tom brought up it is based on where your flashings / windows are - if they are inset, the Tyvek should be under - if you mount them as outies the Tyvek should be on the outside
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Old 04-12-2013, 01:15 AM   #44
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Re: Rigid Insulation


slstech, we are in zone 5, or at least that is what the code is being enforced to.

After this house I will just plan to do 2x6 framed walls if i can.

I reserected the thread to avoid starting a new one. I meant to ask in the post if you put tyvek on or just seal the insulation seams. I put in a sliding patio door on a house where they had rigid foam insulation under the vinyl siding, but no Tyvek. I thought this was odd, but whether it is needed or not, I believe it needs to be or should be applied.
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Old 04-12-2013, 07:56 AM   #45
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Re: Rigid Insulation


lucky you as zone 6 has no choice - though as a best practice & from a performance standpoint, foam on the exterior is the way to go

If you want to use foam as your WRB, you have to use one that meets the WRB specs & install it as tested (i.e. tape the seams with approved tape, etc...) The biggest catch is foam expands & contracts also which can leave openings so you should really use two layers offset or apply a Tyvek like material over or under it
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Old 04-12-2013, 09:03 AM   #46
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Re: Rigid Insulation


I put the siding on, then the foam, then the house wrap! I don't want any water getting to my siding.

Seriously though, it's really great just reading the different opinions and seeing the vast array of knowledge that contractors on here have and not to mention how much we care about doing things the right way. I think it's a good thing to debate these things...keeps everyone on their toes!
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Old 04-12-2013, 09:30 AM   #47
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Re: Rigid Insulation


Quote:
Originally Posted by hillbillyhogs View Post
you need to get a little more education. Ever hear of thermal bridging.
what the real nominal foam thickness of foam backed vinyl? 3/8''?
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Old 04-12-2013, 10:07 AM   #48
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Re: Rigid Insulation


Quote:
Originally Posted by Tom Struble View Post
what the real nominal foam thickness of foam backed vinyl? 3/8''?
HUH???

He made a general statement about rigid foam.
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Old 04-12-2013, 11:58 AM   #49
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Re: Rigid Insulation


Quote:
Originally Posted by hillbillyhogs View Post
HUH???

He made a general statement about rigid foam.
WHAT???

And you made a statement about thermal bridging..whats that?
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Old 04-12-2013, 04:59 PM   #50
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Re: Rigid Insulation


Quote:
Originally Posted by Tom Struble View Post
WHAT???

And you made a statement about thermal bridging..whats that?
Bottom line: This whole FORUM IS A WASTE OF MY TIME AND ENERGY. I AM DONE!!

Bunch of Keyboard Carpenters!! I can back my **** up,

75% of the people on here cannot!
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Old 04-12-2013, 05:19 PM   #51
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Re: Rigid Insulation


Quote:
Originally Posted by hillbillyhogs View Post

Bottom line: This whole FORUM IS A WASTE OF MY TIME AND ENERGY. I AM DONE!!

Bunch of Keyboard Carpenters!! I can back my **** up,

75% of the people on here cannot!
Then delete your account and move on, go help the ppl at diy.com they will think you're smart.
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Old 04-13-2013, 01:06 PM   #52
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Re: Rigid Insulation


In cold zones styrofoam is not a waste of time


http://en.wikipedia.org/wiki/Thermal_bridge


Lumber is a very good thermal bridge. Sometimes on cold mornings I can literally see each individual stud and the rim joist on houses I drive by.

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