Disclaimer: I am not a carpenter or tradesmen. This is the first time I have built anything like this. Still learning.
So, I bought a tongue and groove garden studio kit. It’s made entirely of kiln dried Norwegian spruce. The manufacture recommended a foundation size of 12' 1″ x 10' 1¹⁄4″.
I opted to go with a compacted gravel base, and then I built a wood frame consisting of the following:
- 2x6 PT attached to 4x4 skids that are buried in the gravel and secured with spikes
- rigid foam with seam tape in between joists
- staggered blocking between joists
- 3/4” PT plywood subfloor
Being an amateur, somewhere along the way I screwed up my measurements for the wood floor frame which left me with various areas where my subfloor/wood frame extends beyond the walls of my structure. See pictures. The difference varies from an 1/8”-1/4” and is mostly an issue on the sides and rear.
During assembly it did not dawn on me how catastrophic of an error this is, but now it has.
Other than “tear it down and start over”. What are my options to fix this and prevent my floor from rotting out by the end of the year?
My ideas:
Add siding that would give enough over hang. This destroys the entire aesthetic of the kit and building, but is probably the least invasive solution.
Somehow cut-off the “extra” subfloor and joist material to create an overhang of the existing wall. Not sure how or if this is going to be possible (toe nails, structural concerns, probably has to be hand sawed??)
Come up with some sort of way to flash it with Z or L flashing. Z flashing would need to go behind my first row of boards and in between the subfloor, but there is no way for me to do that now. In retrospect I should have done this during assembly. I thought about maybe cutting a kerf in the bottom board, bending the top of the flashing into the kerf and then sealing the hell out of it.
Thanks for reading this far. I’m desperate as I’ve sunk significant time and money into this project. It’s been fun, I’ve learned a lot, but I’m paying for some mistakes now.