Twist pins are a special type of pins that can be termed as the real solution for your sagging headliner.
How to pin up saggy roof.
Another approach is to give more support to the walls by installing chains attached to the wall plates and linked in the middle with a turnbuckle.
After that use a piece of lumbar strapping to keep the plywood in place until you can get a roofing repair expert to fix it.
Then lower the jack down a little at a time so that the metal can take the weight of the roof.
This is the most inexpensive way to stop a sagging headliner.
Drive the remaining carriage bolts into the two by six rafter and tighten them all up.
Non foundational reasons for a sagging roof.
These pins have a pointy end that twists into the head.
Next place your piece of plywood and styrofoam foam side up against the damaged roof decking.
Additionally if your roofer has used material that is much heavier than your previous roof it can sag for the same reason.
Place the jack back underneath the beam but this time under the iron piece.
Now add collar ties from one side of the rafter to the other.
Once you have established how much the roof sag needs to be jacked up lay a 2x4 plate across the ceiling joists and nail directly under the ridge of the roof.
Two or more roofs on one structure spell trouble.
First perform step 2 except keep the string under your beam and off to the side a bit to make room for some framing.
That s how to fix a sagging roof.
Remove the jack quickly and set the iron onto the entire beam.
The home may not be designed to support the weight of this extra roofing material and it will sag.