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SantanaWoods
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# Posted: 12 Mar 2015 01:10pm - Edited by: SantanaWoods
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Hello
I searched online to see what is the proper wall build up in a wood frame cabin (if you want to have full and good insulation) and oddly enough I have not found anything clear (at least to me) yet.
Is this correct:
exterior:
Outside siding/cladding 1/5 inch
some kind of rails or wood strips to nail the cladding 1/5 inch
building wrap very thin almost 1/16 inch
OSB BOARDS 1/5 inch
2x6 studs/frame containing insulation 5.5 inch
particleboard 1/5 to 3/4 inch
vapor barrier 1/16 inch
gypsumboard or anything like that 1/2 inch
So it adds up to about 8 1/2 inches thick.
interior
gyps board 1/2 inch
vapor barrier 1/16 inch
2x6 studs/frame 5.5 inch
vapor barrier 1/16
gyps board 1/5 inch
adds up to slightly over 7 1/2 inches thick.
1. Is this correct?
2. do we need vapor barrier even on inside walls?
3. on exterior walls using both particle boards and gyps boards on the inside seems like overkill to me is this how it is done?
I gathered the above info after looking at a lot of separate photos from different projects. Any help and clarification is greatly appreciated.
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Steve_S
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# Posted: 12 Mar 2015 01:52pm
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There are variations depending on type of insulation used.
Building Code in Ontario now wants minimum of R20 walls which is nearly impossible to attain with 2x4 construction unless there is an external layers of foam insulation. 2x4 is in actuality 1-1/2" x 3-1/2".
Typically, current building spec is 2x6 or 2x8 exterior. 16" or 24" on centre stud spacing. More & more common is 2x6 @ 24" on centre Advanced Framing. This saves on lumber, increases insulation value and even simplifies some of the construction which is time saving.
From the inside out: typical & conventional.
[list]
[*]Drywall: 1/2"
[*]Vapour barrier plastic (if using porous insulation like batts)
[*]Stud, base & top plate 2x6 (1-1/2" x 5-1/2")
[*]Insulation in-fill between studs (batts, foam board, spray foam)
[*]OSB Sheathing 5/8"
[*]House-wrap (Tyvek wrap) allows moisture protection allowing vapour to exit walls out and prevents rain from contacting OSB
[*]Siding / External finish.
[/list]
Interior "Non-Supporting" walls are typically 2x4@24" on centre with no plastic or insulation. These are room separators. You can put sound deadening insulation in them, run wires plumbing etc. In many cases even a 2x3 interior separating wall is sufficient depending on where it is in the building.
Interior Supporting walls can be 2x4@16" on centre or 2x6 depending on the loads they support.
Interior walls do not need OSB/Plywood "in addition to" drywall. But if your not using DW then a substrate may be needed depending on what you are using... for example you can use Tongue & Groove Pine planks directly attached to the stud work... You can use 1/4" Panelling directly on studs (tad flimsy with 24 on centre studs).
Insulation & vapour barriers:
Depending on the method you choose to insulate with, affects how the vapour barrier is installed/used. Key element is moisture / humidity control and preventing dampness from being trapped in the structure.
This could easily become a book response and un-necessary.
Check these links out.
building science 030-advanced-framing
High R-value wall-assemblies
You can also search the BSI site for Insulation information.
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Don_P
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# Posted: 13 Mar 2015 07:35am
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Most construction materials are called out in the same dimensions as on a tape measure, osb wall sheathing is typically 7/16" (I generally use 5/8 on the roof and 3/4" on the floor), siding can be any thickness, the vapor barrier and housewrap are typically ignored in figuring dimensions, they are about .006" thick. If you do advanced framing (24" on center) use 5/8" drywall inside, if you go with conventional 16" oc framing 1/2" drywall is fine. I'm not a real fan of 24" framing, it shows waves in some surfaces more. Aside, the 100 year old house I'm working on is framed on 2' throughout, back in the 70's it was called Mod24, modular 24" framing.
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SantanaWoods
Member
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# Posted: 13 Mar 2015 01:06pm
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Thanks a million guys. When we go from daydreaming to actually putting ideas on paper we just realize how little we know and how much is to learn.
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