I really like loctites pl premium polyurethane.
Gluing pvc trim to concrete.
I usually end up with cracking or blowouts in the wall.
I either do like has been previously suggested and attach a nailer with tapcons in the mortar joints if possible then nail the trim boards or if it is small and light enough i will glue it.
A polyurethane glue which is perfect for use where a waterproof bond is required e g.
As a general rule of thumb if you re installing trim in temps higher than 80 degrees f go ahead and fit joints tightly.
Pvc trim expands when it s hot and contracts when it s cold.
Gap for every 18 ft.
I have never had any luck nailing straight to masonry.
To securely join the porous hard concrete with the non porous often flexible plastic use an epoxy glue that s ideally suited for work with both.
Use for a rigid bond.
Product may foam slightly.
If it s between 60 and 80 degrees leave a 1 16 in.
6 recommended products for sticking plastic to cement concrete brick 6 results.
Attaching baseboard trim with glue rather than nailing it to the concrete substrate prevents the possibility of splitting or splintering the trim when driving fasteners into the concrete.
Baseboard trim sits at the bottom of the wall to camouflage gaps and gives a room a finished appearance and visual appeal.