I want to install a prefab bath and shower wall surround. The install directions call for bare stud and construction adhesive directly between back of wall surround and wall stud. The exterior wall is insulated with vapour barrier. I can either:
A) remove the vapour barrier so I can get contact between wall surround and wall stud
B) leave vapour barrier in place, install wall surround with no adhesive (rely on flange screws only)
The install directions do NOT recommend drywall behind the wall surround. It specifically states that the back of surround should have direct contact with wall stud.
I would follow the manufacturers instructions for warranty purposes. I believe the reason for removing the drywall (or not having it behind the surround)has to do with breathing space between the outside wall and the tub surround. The condensation would accumulate in the drywall area and be a potential health issue. I would call the supplier and ask about the insulation and vapour barrier. I like the foam concept but there may be other options.
You must have the 6ml vapour barrier in place or you will have warm air making its way through the walls and condensing.
I would replace the existing vapour barrier as it most likely damaged from your drywall removal. New vapour barrier with the perimeter acoustic sealed and sheath taped will ensure no warm air enters the wall and insulation space.
The acrylic panels can be secured with stainless steel screws directly to the studs. The vapour barrier will not compromise the installation. This installation method would be considered direct to stud.
There are several ways we could still attach the surround. One common way is to use cement board instead of drywall. The cement board will provide the secure adhesion required and still accept the anchors provided.
Let me know if we can be of further assistance
Remi's Handyman Services - RENO TEAM
A simple solution would be to install a 1/4 strapping to the studs Over the vapour barrier that would allow you to keep the existing insulation and vapour barrier and still use an adhesive to secure the panels as per manufacturers recommendations
You could use a inexpensive 1/4 plywood cut into 1-1/2 strips and secure it with ring nails or 1/4 x 1 narrow crown staples
Hope this helps
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