Wood – Ramp for a tool shed

I think:

1. No, it is not a good idea. You can expect all the difficulties of renovation, new construction, and building relocation, combined. Perhaps also conflicts with land use regulations as well. Without tying the roof to the adjacent structure, expect water damage to both the shed and the home.

2. Support for the shed should be suitable for the soil and drainage conditions local to the site. A proper foundation would be the preferred solution. Whatever is constructed should be in accord with current building codes and meet the requirements for wind and seismic forces.

3. A concrete slab might provide better long term performance.

4. See answer 3.

Assuming that the 3 2x8s will work for you - and it sounds right for your situation then you are fine with adding some sort of plywood to make your header flush.

However I usually (given I have the space) would throw down a 2x6 flat on top of the 2x8s that are on the jacks (yes you must have jacks for your header). This gives good reference points for top and bottom.