Over the tongue of the trailer I have designed a space to serve my secure storage needs. This is where I plan to install all the components for the tiny house that for one reason or another do not need to be inside the living space. The propane tank, tankless water heater on one side, and batteries, inverter, charge controller, electric panel on the other with a partition in the center. There will also be some shelves for tools and other misc. storage.
This is the same process I used to construct the main subfloor for the rest of tiny house.
The polyethylene feet will prevent water from staying in contact with the wood of the subfloor due to condensation or rain. Also, they are durable and will not rot.
I wanted to have as much utility space as possible, but without infringing on the bathroom window trim and utility roofing system. In order to achieve this I measured down from the window for each material that would take up space including the window trim, endwall flashing, aluminum shingles with underlayment and the roof sheathing. This gave me the maximum height I could frame to. The purple lines on the underlayment show the progress. I also marked the studs for secure fastening.
Heather wields a nail gun for the first time and does a great job.
The utility partition will separate the wet side (water heater and propane) from the electrical side (batteries and electrical panel).
I roofed the utility annex with the same aluminum shingles used on the main roof.
Even though the underlayment is sticky, it is still is a good idea to use staples to hold it in place on vertical surfaces until the siding is applied.
The completion of the utility annex also allows us to continue the siding up the bathroom wall.