Garage sealing

[Winginit]

I am installing insulation and heating into my garage. The electric heating unit and insulation is installed. Planning to use plywood instead of sheet rock for the walls. My concern is the snow melt from the cars being absorbed by the plywood and causing moisture build up in the walls. Thoughts on best way to seal the concrete floor and plywood so that the moisture doesn't get absorbed, where the floor and wall meet?

 

[BigSalNY]

you could use copper flashing or rubber shower pan liner. I would lay out 30" wide piece and then set the floor sill plate on top of that, build the wall and install sheeting. Then continue the flashing up the wall.

another option is using Red-gard or a similar waterproofing mastic on the wall sheeting and the floor joint.

 

[Kaizen]

i'd put a base of 1x12 exterior trim along the bottom with the ply on top of it. That would prevent wicking and can be painted same color. I'd still be concerned about water getting to the studs though. I used a 1 foot concrete knee wall to keep the wood dry. previous suggestion for shower waterproof material behind/under the pvc baseboard is best i could think of. If the garge is sloped to the doors probably not an issue.

 

[The Cobbler]

keep the plywood up off the concrete . what did you do with the bottom plate for this issue?

 

[CraigStu]

I am with Kaizen on a pvc board at the bottom. Run a heavy bead of sealer in the corner where the bottom plate hits the floor. That way, as you sit the pvc down it settles into that bead and squishes it out underneath and also up the inside. If you get some of the 1x trim boards often they are actually 1" thick. Trim the same width off the plywood, set it on the pvc, and you now have a nice base board already installed.

 

[phred]

I used PT 2x10’s for base boards and plywood above that. Though and water is no issue.