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OPINION: "Skinning" existing stucco-over-drywall construction with thin plywood - Wood this be worthwhile ?
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October 4, 2017 - 3:46 pm
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Hi Dennis et al… (please pardon the awful pun in Topic name… couldn’t resist)

In the recent SOWA DIY studio build video, one notable aspect is the choice of material for the walls: plywood. Dennis has said it before, that the reflection spectrum of real wood is more pleasing than that of common drywall, and here we see Mr. SOWA putting that advice into action.

I am renovating/redecorating my dedicated Listening Room, and the thought of skinning the existing walls with thin plywood has manifest itself. FYI, the space falls into the yellow zone (or perhaps the red) of Dennis’ room dimension chart – measuring 14 x 18 x 7.33 ft (inside finished surfaces). Too damn small I agree, but we are in no danger of moving and this is the space I have to play with. In a basement setting, the floor is carpet+underpad over concrete, ceiling is popcorn-finished drywall. BTW Dennis, this is the space we talked about in Room Analysis #141.

Primary pursuit & optimization is toward 2-channel playback, despite a 50″ TV on the wall and 5.1 surround gear doing its thing when called upon. My preference leans toward more direct vs reflected sound, but if retrofitting the walls in wood would help significantly, I’m game to make the change.

Seeking opinion and advice from this forum as follows…

Q1: is there a minimum panel thickness required for the “wood tone” to come through ? Quarter-inch, or perhaps 3/8-inch would be “affordable” and not impact the volume of the room in any meaningful way.

Q2: choice of veneer – maple / aspen / pine – is there a strong argument for any particular species ?

Q3: is the ratio of wall area to ceiling + floor area sufficient to make a material (and perceivable) difference [ walls: 475.5 sq-ft / floor+ceiling: 520 sq-ft ]

Thanks for reading, thinking and commenting,
Grant

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October 5, 2017 - 8:19 am
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G, We use 3/4″ thickness. If you are covering existing drywall, use a damping layer over the drywall and then secure the plywood to damping material and drywall. Stay with soft woods. Maple is too hard. With those room dimensions and all of that 5.1 energy, have you planned for your low frequency requirements? I am showing + 13 dB issues below 100 Hz. Your ceiling height is causing all the low frequency issues.

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October 28, 2017 - 11:01 am
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Hi Dennis

Thank you for the quick answers.

After some consideration, I’d like to clarify your response for my better understanding, if I may – and so that I can move my project along with the benefit of your insights.

Dennis Foley said
G, We use 3/4″ thickness.

Yes that makes sense, given new construction. My question is about covering existing structure (walls) with a different material.
Will THIN PLYWOOD give the desired “wood signature” to the reflected sound ?

Dennis Foley said
If you are covering existing drywall, use a damping layer over the drywall and then secure the plywood to damping material and drywall.

This is a pic of one corner, showing the drywall and textured stucco covering it.

https://vgy.me/z2y6KB.jpgImage Enlarger
_
Can you please suggest what material to use for the damping layer.

Dennis Foley said
With those room dimensions and all of that 5.1 energy, have you planned for your low frequency requirements?

As noted initially, this room is PRIMARILY focused on 2-channel reproduction. Given my dimensional constraints, getting 2-CH Bass under some control is about all I can hope for.
The HT/5.1 scenario will just have to do without full optimization Cry

To help with the LF pressure problems, I will build BDA units from your plans… The Sam Small videos give me hope !

BTW, is there a DIY version of your SWCP ?

Thanks again Dennis.

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October 28, 2017 - 12:31 pm
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A, No DIY option for this product.

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October 28, 2017 - 1:20 pm
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…and… my other two questions ?
(which actually impinge on construction plans)

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