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  #1  
Old 11-08-2014, 06:59 PM
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Default single layer shells?

Ok so mdf is like 33 bucks for 3/4
Baltic birchis 65+ special order
That cheap birch ply is 45 a sheet

My question is is using 2x4s pl and screwed to a single layer enough (entire outer shell) and then maybe like some cross sections added enough?

Ive always double (current wall is triple layered)
But spending 33 dollars a sheet 14 sheets is just nuts lol

Ive seen metal shells working with single layer outer shells
But at 2.75 thick and some internal bracing im thinking ill be fine?

Baffle will de double layer with bracing internally for sealed section

And yes it is cheaper i can get 8 foot long 2x4s for like 98 cents

Plus 230 for 7 sheets vs
460ish for 14 sheets
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Old 11-08-2014, 07:31 PM
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2x4s in a frame fashion (2x2 side attached to the wood) 6" on center would be oober strong
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Old 11-08-2014, 07:41 PM
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Originally Posted by Jeffhulbert50 View Post
2x4s in a frame fashion (2x2 side attached to the wood) 6" on center would be oober strong
Haha yeah that would be alot of 2x4s thoim figuring 35 id have to double that lol

Box will be 72 long 33 high 42 wide without 2x4s
Im leaving about 2.5 inches off top and bottom and sides will have a good 4 inches due to the topper
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Old 11-08-2014, 07:48 PM
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you can save wood and run them angled. itlls be stronger that way as well since the whole sheet would have to bow out
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Old 11-08-2014, 07:56 PM
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Yeah i was just gonna do length ways haha

Diagonal sounds betterand ill see if i can fit a few going the other direction
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Old 11-08-2014, 09:03 PM
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IMO.. the real deal birch is worth it. I used it on my most recent box. Double all the way around and triple baffle with no bracing so far and it's already extremely strong.
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4 15s + Flat Wall + 10k = Loud

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Old 11-08-2014, 09:12 PM
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Originally Posted by SINTORMAN View Post
IMO.. the real deal birch is worth it. I used it on my most recent box. Double all the way around and triple baffle with no bracing so far and it's already extremely strong.

Yeah id almost order it somwhere else tho menards doesnt stock it and a buddy ordered 2 sheets and one came with a huge crack in it

I dunno if you got a wall but even single layer would be 500 bucks for 7 sheets

And regardlessi feel like 70 inche long surfaces will still need bracing even if i got the really good stuff
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Old 11-08-2014, 09:34 PM
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Quote:
Originally Posted by Nate Futuristic View Post
Yeah id almost order it somwhere else tho menards doesnt stock it and a buddy ordered 2 sheets and one came with a huge crack in it

I dunno if you got a wall but even single layer would be 500 bucks for 7 sheets

And regardlessi feel like 70 inche long surfaces will still need bracing even if i got the really good stuff
You can put in steps to make it stronger. Like bring in the wall 4" over 4" and then back 4" or something to make that 35" across. This is my wall. Ended up being like 6 sheets of 5'x5' iirc. Double all the way around and triple baffle.



You are totally right. Large cross-sectional areas are weak inherently so you either need to brace or break it up by stepping in etc... I'd ask local lumber yards on pricing.
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Old 11-08-2014, 10:14 PM
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A single thick brace from front-back/side-side/top-bottom in the middle of the panel is about as strong as doubling the thickness of the panel. I would rather have some internal bracing with good contact than a bunch of 2x4s that may be bowed and have poor contact with the wall and no clamping action.
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Old 11-08-2014, 10:28 PM
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Originally Posted by SPLEclipse View Post
A single thick brace from front-back/side-side/top-bottom in the middle of the panel is about as strong as doubling the thickness of the panel. I would rather have some internal bracing with good contact than a bunch of 2x4s that may be bowed and have poor contact with the wall and no clamping action.
Though the 2xs arw cheap they are very straight for the price

The main goal im shooting for is under 300 in wood costs. I plan on doing bracing with wood dowels on the sealed section i got about 7 3 footers so ill have quite a bit (sealed section will be 12 inches deep)

Then i got some prety thick angle iron for the joints

I think imma do some threaded pipe top to bottom in the ported section

I have plenty of screws and glue from the last 3 walls ive done i just dont think double laying is going to be cost effective in this instance
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