I want to fit a two post car lift and rather than the present 2.4mts headroom it should be nearer 3.5 mtrs. Talked to the garage supplier and he said jack up the garage and build a 1.2 mtr breezeblock wall then bolt the garage down on to that.
He said they have a structural engineers certificate for the 2.4 mtr timber box height and do not want to get into going above that height.
So prior to getting a structural engineer to do the calcs what are the panels thoughts.
My thoughts are.
If I put in a 1.2 mtr high timber sections using the same 100 x 45 members between the roof and the top of the existing box.
The extra weight of the garage is not significant to the under buildings.
If the roof has a heavy snow load that would put a more stress on the new section / old section interface and down at the joint to the underbuildings.
The main problem would be the bending effect at the ground on a high wind day as the wind load is higher due to the extra sail area and the extra load is at a higher levering point.
I know that I need planning permission if I go above 4.0mtr and I would be about 4.5mtr.
Has anyone do such a project!