I want to increase the headroom in my garage to use a car lift. No, I do not want a pit so please do not suggest one.
I have 2.4 mtrs under the trusses and would like nearer say 3.6 mtrs under the trusses.
The garage is timber construction 6m x 6m made of 90mm x 40mm uprights with 19mm boarding and its on a 4" block wall all round. It has a 4" thick concrete floor and the external earth comes to about 6" below the block wall garage interface.
When we built the garage the contractor had to go quite deep to reach hard pan and the block walls are 1.4 mtrs high.
Now the idea I have is to remove the concrete floor and say about a further 1 mtr of hardcore and then relay 200 mm of concrete. Therefore I will possible get
3.3 mtrs clearance under the trusses.Will the following probably happen.
Will the timber garage tend to pull the 4" wall down and at the front there will be a large hole in the wall of 5mtrs by 1 mtr that was a block wall before.
Will the earth outside the garage tend to push the walls in.
How do I stop moisture coming through the walls if they do not fall in.