I want to replace the garage door with a wall that will have an entrance door and a large double-hung window. I was told I should have the garage door removed, frame out the space for door entrance & window with treated wood, place sheets of treated wood for wall, place wiring on the treated wood to apply stucco, stucco the wired sheets, put a sealer on the stucco and paint the wall. The interior wall will be insulated and dry-walled. Does this sound like a well structured wall? Or am I wasting my money? Thanks.

I would do the same but question why you would need so much pt wood. This is basically a house wall and they aren't constructed with pt wood except for the sill plate.

Thanks for your reply. I didn't think so much wood is being used - framing to hold the ply boards, door, and window. This enclosure will be a music room and the interior as I indicated will be insulated (for draft) and then dry-walled. I will look for materials I can use to sound proof the room - any suggestions? Thanks.

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Originally Posted by ma0641

I would do the same but question why you would need so much pt wood. This is basically a house wall and they aren't constructed with pt wood except for the sill plate.

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Thanks for the reply. Please forgive my ignorance. Are you saying the new exterior wall should be cinder blocks rather than a "wood panel" wall? Thanks. I also want to sound proof the room.

I was questioning why you need so much Pressure Treated -PT- wood. Only the sill plate needs to be PT, rest can be hem/fir or spruce etc and an OSB cladding. Whoever does the finish would put tar paper, mesh and then stucco. For soundproofing you need density, thick walls or 5/8 drywall but your window is the biggest sound transmitter so thickness is a bit meaningless. Google "Sound Transmission Loss ratings" for ideas. If we are building a sound deadening wall, we try to eliminate windows.

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Originally Posted by ma0641

I was questioning why you need so much Pressure Treated -PT- wood. Only the sill plate needs to be PT, rest can be hem/fir or spruce etc and an OSB cladding. Whoever does the finish would put tar paper, mesh and then stucco. For soundproofing you need density, thick walls or 5/8 drywall but your window is the biggest sound transmitter so thickness is a bit meaningless. Google "Sound Transmission Loss ratings" for ideas. If we are building a sound deadening wall, we try to eliminate windows.

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Thanks again for your quick response. Regarding the pressure treated-pt-wood, I figured because this is an exterior wall being exposed to the elements, I want to make sure the wood holds up well through the seasons for years to come (I cannot afford the cost for cinder blocks). Please let me know if you feel/think I should use cinder block and if I’m putting too much thinking into this. Thanks. Regarding the window - I will construct a framed shadow box (with doors) that will surround the window. The design will allow me to open the doors hinged to the box to allow nature light in, or close it when using the sound proof room. I design window treatments (they are artwork designs, giving the illusion of a framed art piece). I can deaden the sound for the window area when I construct the shadow box. Again, thanks so much for your input. I look forward to your reply.

No need for block, 99 % of homes are frame built. Build your wall out of frame construction with a pt bottom plate, a stick built wall, cover it with OSB, cover that with tar paper, plaster mesh and then stucco. Wall will probably be there after you. If you want to improve the STC, build the wall out of 2X6. Hope this helps, if do please click on the green helpful thumb. Thanks

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Originally Posted by ma0641

No need for block, 99 % of homes are frame built. Build your wall out of frame construction with a pt bottom plate, a stick built wall, cover it with OSB, cover that with tar paper, plaster mesh and then stucco. Wall will probably be there after you.! If you want to improve the STC, build the wall out of 2X6. Hope this helps, if do please click on the green helpful thumb. Thanks

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Thanks so much for your advice - it helped a lot - I feel confident to move forward with the project.

Since there is no raised foundation, and the wall will be right to the ground, you could use PT plywood 2' across the bottom (expensive) and OSB above it. And the PT bottom plate should have lots of caulk under it because it will be open to bugs, and even mice, who can get under the tiniest bump between concrete and sill. And flashing along the bottom siding, whatever you use.
Some of this depends on whether there's a good down slope out from the door, and if it's concrete.

To follow up on Joys post, the energy code in the US requires some type of sill seal. Most new construction uses a closed foam strip, comes in a roll and is available at HD or Lowe's in the construction area. We use miles of this in our Habitat For Humanity homes.

I might also recommend you consider this Drywall To Enhance Sound Transmission Loss Through Walls