Building Homes or Extensions/Shed load capacity...


Shed\'s frame
Shed's frame  

Shed\'s support
Shed's support  

I just moved into a house that has a shed on the back yard (12ftx20ft)with metal siding, it's about 2 years old. my ultimate goal is to park my racecar (2500lbs# in there, so the car will come in and out the shed one every 5 weeks.

The shed is supported as follow:
Left side span #2 1.5x2 screw together#in 4 point with cinder blocks.
Right side span also in 4 points
the 2 middle spans in 3 points

The joist are 2x4, 14in apart, and the floor looks like OSB screwed into the joist.

I'm planning to lay a single 2x10's for the wheels to roll #1 on the left and 1 on the right) but I'm afraid this wont be enough...

How can I calculate the load capacity of this shed? and if not enough how can I reinforce it?

Thank you.

Hi Rafael , if you measure how much tire tread is on the ground t ny given time you will probably find that your bearing capacity only needs to be a hundred pounds a square inch which isn't that much.   I don't quite understand your description of how the shed is supported. However if the joists are running across the garage and you can get a cinder block under each joist within a foot of where your 2x10s will be placed, your floor system should easily support the weight.

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Bruce E. Johnson


I can answer any construction related question in regards to carpentry, concrete, drywall, masonry, structural elements of any type of building, residential or commercial. Interior or exterior.


Custom Commercial and residential buildings. Churches, theaters, schools and auditoriums. Most recently I am working with the Catholic Church on several design build committees. I have a website related to scheduling and project supervision. Although my expertise is more related to multimillion dollar commercial, educational and theatrical projects my generous credentials in residential and remodelling construction make me a viable source of information regarding all forms of building questions.

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