I'm at the point where I want to install some T molding for the transition from our main room to the bedrooms. I just took a look at the directions and they only show screwing the track into the subflooring. Right now I only have the moisture barrier down above the concrete subflooring, so I dont think I can just screw it down. I guess I was thinking I could glue it down, but this would require me to cut into the moisture barrier, which I'm not sure is a good idea either. I'm wondering how I should do this?
Update – Added picture of T molding pieces if that helps.
Best Answer
I know this is an old question, but here's what I did:
(1) drill holes in the concrete. Yes, this is a PITA, but with the right bit it is not too bad. The holes do not need to be huge, nor do they need to be deep if you use the right screws.
(2) Use the right screws. The ones I used are from a standard Big Box store, and are specifically designed for concrete. They specify a hole size to use, and the screws themselves seem to self-destruct as they dig into the hole.
(3) Since I am also puncturing my moisture barrier, I did apply a line of silicone around each screw as I put it into the floor. This pushed the material into the hole, under and around the hole in the moisture barrier, and under the screw itself.
So far, this seems like a good install, although it's only been a week, and they were well away from the foundation's perimeter, and above grade.
Also, while I did one this way after the floor was installed, I did the next five before installing the floor, since this is not only dusty work, a little water (and associated drying time) helps a lot with the drilling.