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Old 01-16-2012, 12:07 AM   #1
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Your thoughts on framing plan...


I am planning on building a small cabin, 16'x 36', on a pier and beam foundation with 12"sonotubes, with a slanted shed-style roof.

I want to build with 2x8's for the walls", to accomodate r-35 insulation, 2x10's for the floor joists with double 2x12 beams, and 2x10 rafters. r-40 insulation in the floor and ceiling.

This is my first diy effort to build something, and any advice would be appreciated.

I am considered to be a "handyman" by people that know me.

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Old 01-16-2012, 12:09 AM   #2
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Your thoughts on framing plan...


Sounds heavy duty.

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Old 01-16-2012, 12:13 AM   #3
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Your thoughts on framing plan...


yeah, primarily too accomodate the insulation
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Old 01-16-2012, 01:51 AM   #4
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Your thoughts on framing plan...


Some have gone to double 2x4 with 2x8 plates, offset the studs so inside and outside wall only connect at the plates. Helps with thermal transfer

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Old 01-16-2012, 09:57 AM   #5
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Your thoughts on framing plan...


Are you going to need a building permit for this? If so, your plans will require approval. One thing does jump out at me: unless your're using some type of insulation I've not heard of, or are spray foaming, your studs, joists, and rafters aren't big enough for the level of insulation you say you want.

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Old 01-16-2012, 10:16 AM   #6
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Your thoughts on framing plan...


Quote:
Originally Posted by md2lgyk
Are you going to need a building permit for this? If so, your plans will require approval. One thing does jump out at me: unless your're using some type of insulation I've not heard of, or are spray foaming, your studs, joists, and rafters aren't big enough for the level of insulation you say you want.
Yeah. You're trying to pack too much insulation in your proposed bay depths.
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Old 01-16-2012, 10:17 AM   #7
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Your thoughts on framing plan...


Quote:
Originally Posted by mae-ling
Some have gone to double 2x4 with 2x8 plates, offset the studs so inside and outside wall only connect at the plates. Helps with thermal transfer
?????
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Old 01-16-2012, 11:04 AM   #8
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?????
Yes. Also a common practice for soundproofing.
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Old 01-16-2012, 02:01 PM   #9
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Originally Posted by mae-ling View Post
Some have gone to double 2x4 with 2x8 plates, offset the studs so inside and outside wall only connect at the plates. Helps with thermal transfer
Thats what I'd recommend
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Old 01-16-2012, 03:53 PM   #10
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Your thoughts on framing plan...


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Originally Posted by titanoman View Post
?????
You put the studs 16" oc but the inside ones are spaced 8" off the outside ones. So no stud goes completely from the outside to the inside.

Another method is building 2 2x4 walls spaced 3.5" apart and using 3 layers of r12 insulation.
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Old 01-16-2012, 04:30 PM   #11
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Your thoughts on framing plan...


This is the idea. If using two plates, the space between them assures minimal sound transmission.

Usually, the insulation is woven between the studs... side to side, instead of up and down. On the double plate walls, you can do more layers, installing it normally (up and down) on the back wall first, then the inside wall... and even one woven in between if you want.
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Old 01-16-2012, 05:23 PM   #12
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Originally Posted by mae-ling View Post
You put the studs 16" oc but the inside ones are spaced 8" off the outside ones. So no stud goes completely from the outside to the inside.

Another method is building 2 2x4 walls spaced 3.5" apart and using 3 layers of r12 insulation.
You could also use R15 which fits into a 3.5" space
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Old 01-16-2012, 07:36 PM   #13
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Your thoughts on framing plan...


ive never heard of staggered stud walls working for a extra r- rating, its primarily for stc ratings.

using 2x8 will work, but it will not only cost more but will also be much harder to stand the walls from the added weight

regarding the last post , if this place is to be inspected r-15 insulation wont pass an inspection. in most regions the minimum is r-24 which is achieved by framing 2x6 walls and either using r-19 batts and 1" of foam on the exterior or by using r-24 batts
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Old 01-16-2012, 07:43 PM   #14
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Originally Posted by woodworkbykirk View Post
regarding the last post , if this place is to be inspected r-15 insulation wont pass an inspection. in most regions the minimum is r-24 which is achieved by framing 2x6 walls and either using r-19 batts and 1" of foam on the exterior or by using r-24 batts
Using three layers of 3.5" batts, as a previous poster suggested, would give a nominal combined rating of R45. I'm not saying it's the cheapest or most efficient, but it's not the R15 that you assumed

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