Doors and Windows - Screwing into trim? Please help!

Hello all. This is probably an easy question, but can I screw into the trim of a cased opening? I tried installing the track for a bi-fold door and the screw just stripped a clean hole in the rock-hard wood. Smaller screws wouldn't work with the hardware. I'm hoping someone out there has done this without having the nice easy sheetrock to screw into. Underneath the trim is about an inch gap before you hit wood, so not even a nail would be long enough. =( Please help!

Did you pre-drill first? That's what you need to do.

Bifold door tracks usually mount to the top of the door jamb, typically about 1 3/8" back from the edge of the jamb. You should not need to screw into the trim or the drywall. If you need to drill in a new spot, predrill a new hole in the bifold mounting track with a drill bit that is larger than the screw diameter. Then predrill a hole in the top of the door jamb for the screws using a drill bit that is smaller than the screw. When you install the screws, just bring them up snug. If you are using a cordless drill to install the screws, you probably stripped the screw by continuing to turn it AFTER it was snug. Most drills have a clutch that help you avoid doing that.

I will try pre-drilling; thank you! X: when you say I don't have to drill into drywall or trim, it makes me think my doorway really is odd... it has trim wrapped around the underside of the door jamb (if that's what's directly over your head when you walk through the opening). Off to Home Depot for a drill bit!

It does sound a little odd, or maybe I'm just not picturing it. Usually the track is mounted on the wood jamb, not the trim (casing).