We are planning a project using Azek (expanded PVC) 3/8″ x 5 1/2″ Beadboard overhead in a bathroom.
The room may see one or two short showers daily. It is on the second floor (attic overhead) and is vented.
The existing ceiling is quite low and built in cabinetry precludes lowering the ceiling much if at all.
The present structure is plaster over sheetrock, about 7/8″ thick, painted with a glossy paint. Joist spacing is 16″ oc.
The game plan is to glue (LN603 Trowelable Liquid Nails) and nail (15ga x 2″) the beadboard to the existing ceiling. The Azek product calls for 12″ oc nailing for overhead applications, I am counting on the glue to make up the difference in oc nailing specifications.
How shoud I prepare the ceiling prior to glueing and nailing the boards? Should I spot glue or set each plank in a bed of glue?
Any special precautions about trapping moisture between the beadboard and plaster ceiling?
Any other thoughts or comments relevant to the project are certainly welcome.
Replies
I've put in shower modules and when you glue them to the walls with Liquid Nails, you liberally apply the mastic, pull it off the wall, let it set up for a few minutes, and then repress the plastic to the walls. I'm not certain if your Aztec material is similar since it's plastic or not. Sounds like a cool aesthetic detail. Good luck....
I'm having a hard time imagining what kind of nail will run thru 5/16" azec and then 7/8" of plaster before hitting wood and still hold and not fold.
i would find a way to remove the SR and plaster then shim out appropriate amt. to nail the AXEC up.
other than that, you should not have much trouble as long as the temps don't vary to bad.
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"I'm having a hard time imagining what kind of nail will run through 5/16 azec and then 7/8 of plaster before hitting wood and still hold and not fold...."
Try shooting a 16 or even an 18 guage brad nail...both will work...I've done it many times using Azec trim for bathroom windows.
The 16 guage is stronger and better suited, but I've shot 18 guage in a pinch and they work, though I've sometimes encountered "shiners" with the 18 G.
Davo
Real plaster?
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I personally would not remove the sheet rock or the plaster so long as both were intact and in good shape. I too, like you, would glue directly to this surface and then finish by caulking the perimeter with a good quality silicone based caulk.
I have glued up RFP (Reinforced Fiberglass Panels) to the ceilings of showers with very good success. I have used Azek in bathrooms but more for window trim than for wall or ceiling use. I question whether Liquid Nails is a suitable ( compatable glue) for the Azek. I know that when glueing Azek to Azek ( miters, etc) I use regular PVC cement.
When glueing RFP I use regular (water base) RFP glue (in a can) by Tight Bond Company. I don't know if this same glue would work better for you than the Liquid nail or not. The RFP glue has very good "grab" qualities. If this glue would be found to be compatable with Azek, I would use this glue before using the Liquid Nail brand.
When glueing RFP, I always go over the piece with a hand held "J" roller ( type used in veneer work), plus I have a 2X4 that is carpeted with a piece of scrap carpet and I use this to help embed the RFP as well. Knock on wood, but I've never had any come loose to date. All but one were glued over new, moisture proof drywall. The last bathroom I did however was over sheetrock that was plastered. I skim coated this plaster to fill in voids, and then glued it on...no problems reported so far.
Lots of luck with your project.
Davo