Micro Quonset hut

I have been beating my head over building a storage shed for the wife's lawn tractor. Had a wooden one delivered by Costo but as things go it is now storing other implements. Today I decided I'll order a 10ft culvert 10 ft long. The culvert bolts together so that would give me two 10 x 10 sections allowing me to construct 10x20 ft Quonset hut, which is acceptable to build without a permit. 4 ft pony walls to give added head room. Might be a great tiny house start.

Clever thinking!
What is a cost comparison between the culvert and a shed?

After roofing the Costco shed nearly identical will be about 2k

Excellent idea, Robert!
I like it. It might have some condensation at times, but overall, a great equipment shed.

Since you say the culvert bolts together I assume it is metal.  My concern is rust as I have seen many smaller metal buildings and sheds totally rust away.   Can you tell me the significant parameters where you can determine if the metal is suitably galvanized and the thickness of the metal so that it will last a long long time as exposed to the elements.    How does culvert metal differ from the  normal or various quonset hut "corrugated" sections that are bolted together?   Is it recommended to put a coating of some sort like paint on the exposed culvert ?

The culvert is made to have a constant water flow. 12 gauge happens to be quite a bit cheaper than 10 gauge. Though a bitumen coating over the galvanized is available I don't think it is necessary for this application. I am not sure what the bitumen coating would do to address condensation if anything. A customer has a spray foam business so a consideration for condensation. My steel guy will be coming back next Wed. with a final quote.

quote :   order a 10ft culvert 10 ft long. The culvert bolts together so that would give me two 10 x 10 sections
allowing me to construct 10x20 ft Quonset hut, which is acceptable to build without a permit.
4 ft pony walls to give added head room.
============================================

Are you building the pony walls with steel studs and steel flat panels or maybe concrete block etc ?    How will you give the walls rigidity to keep them from blowing over in a small wind ?     So the max height of the shed is going to be 9 feet.   There should be plenty of head clearance..