I doubt if you can use your existing trusses.
Raising my garage roof.
If you are in a situation where you can t remove the posts then you can attach extenders to the top of the posts that are already in place.
If you need to lift the walls again the gap will stay covered.
Lift garage poor small wall and set garage ontop of wall.
You might also try raising the actual garage itself but this obviously has structural challenges.
Then place the poles back on the spot they came from but higher now.
If a gap doesn t close up try laying a plank across the roof and pound on it with a sledgehammer.
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Then run new studs up adjacent to your existing studs and put on new sill plates and a new roof.
Currently whilst the pitch roof is of substantial height the trusses get in the way of access the full height.
Finally fill in the outside of the wall with tapered pieces of sheathing and siding.
Below the top of the foundation wall.
Ways that have crossed my mind but of which i have no idea that would pass muster would be.
It has a pitched roof using modern w style trusses and concrete tiles.
I have a detached brick built garage with the usual roof trusses.
Additional support may be needed if the roof is not very stable.
Lift garage lay a few course of block and sit garage back down on blocks.
Build a small framed wall of desired height increase lift garage and secure to new mini wall.
Before applying the finish siding install metal flashing over the sheathing and let the flashing run 3 in.
You could brace the inside of your garage and use hydraulic lifts to raise the roof.
The major downside to it is the height of the door opening at about 1 9m and the floor to ceiling height of approx 2 4m.
Consult a contractor for an estimate.
I want to increase the headroom in the garage so that i can put in a car lift into the garage which allows 1 car to be raised and another car to park directly underneath.