The headliner basically detached from the ceiling of the car in the heat/humidity we had here this week. It appears to be in pretty good shape, aside from the fact that it is not attached to the ceiling. Is this a DIY, or should I go to an upholsterer?

Thanks!

Thanks, all, for your responses!

I ended up doing this myself, and it was a lot better than I expected! Bought a headliner at JoAnn fabrics, bought spray adhesive, took out the old liner, rubbed the old, dried-out glue off with gloved hands, and carefully glued and applied the new liner, cut, and voila! It looks great! Thanks again!

Good news!
Pretty rewarding, eh?

You won't be able to re-glue your old headliner back into place. Period.
Redoing it is a PITA. I did it on my '86 745T - twice! (Because I cut it too short around the sunroof the first time - live and learn)

If you take your time and do it right, you will be thrilled with how good it looks.

I bought the headliner material from JoAnn Fabrics. It was very reasonably priced and has held up well for the past 5 years. But my car spends a lot of time in the shade these days.

It's a job. The foam gets old and falls apart, trying to re-glue sections will not work as the entire liner needs to be replaced. Fabric stores have replacement fabric in several colors plus cans of fabric glue.

This is a looong video and takes a while to get to the station wagon, which is much easier to work on. The V70 models are easier then the 850s, but still time consuming. Yes, to have a couple of people putting the new liner on is a plus, but a single person can do it: just spray the fabric glue on just half of the fabric, stick the fabric and then spray the remaining fabric and stick the other half. Having 6 inches of overlap is not a waste, it just gives you some wiggle room.
https://www.youtube.com/watch?v=KFz7rvEIFXY

Less than $100 DIY. Upholstery shop cost????

BTW, wearing latex gloves while handling the newly refurbished headliner keeps all of the finger prints off.
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My back feels better when I sit in a Volvo seat

I did this on an 850 sedan, you should be able to find a YouTube or some info on your model. Basic procedure is to remove trim and take out headliner cardboard thing that headliner was glued to. Since you have an XC or wagon, getting it out will be easier than a sedan. use a brush to scrub/rub off remnant fabric/foam. Hancock Fabrics, if one is near you, stocks a good selection of foam backed headliner material. The spray can of glue cost a bit more than the fabric, so if you can do this yourself, probably under 50 bucks. Mike

http://www.matthewsvolvosite.com/volvo-850-headliner-repair-diy-tutorial-w-pics.html