The roof is made of timber mostly with alloy edges if it s sagging then the bonding isn t bonding and water ingress has rotted some of the timber.
2013 regal roof sagging.
Remove the sunvisers screws and be careful unplugging the wires up in the headliner.
Fyi if you have a sunroof and the headliner is loose and hanging low with light shining in.
If you refer picture 6 rear view while pulling down you can see that the lower mate on the topside of the headliner is mounted to a white box of sorts.
Undersized rafters also can cause sagging along the whole side or plane of a roof.
Remedies for a sagging roof.
Glued to the headliner is a plastic ring that encircles the sunroof opening on the inside.
Pull the a c pillar plastic trim away from the windows they trim.
Rv sagging roof repairs non aluminum rv s the vast majority of rvs built today have a vacuum bonded solid roofing structure.
You can simply have the old sheathing replaced with better material when it s time for new roofing.
Pull parallel to the side of the car.
Basically it s a one piece roof consisting of plywood decking on top some type of insulation installed between the support rafters with a panel type of ceiling finish.
Pull the door opening trim down at each door.
Pull the trim down off from the courtesy light put the front seat backs back.
Sagging rafters can lead to serious problems with the entire roofing system.
If a roof dips in between rafters or trusses it s probably because the sheathing is too thin for the span.
The fix here is to replace the thin sheathing with thicker sturdier sheathing.
If the roof sags between the rafters or trusses the most likely cause is sheathing that s too thin for the area it covers.
If you notice that there is a visible dip in your roof chances are you have a problem with one or several rafters and you may soon be facing more issues like water leaks bowed out walls or your roof caving in on you.
If the framing is sound and problems are not found elsewhere but the roof still sags the problem might have originated because of poor installation of the plywood sheathing or shingles.
I tried to attached a pic here.
I finally pulled down a on the headliner a bit and found the problem.