I've bought and assembled several Arrow Metal storage sheds in the
past. Just bought another one from Home Depot (I'll post THAT
experience in another thread..). In the past I just bought a couple
sheet of ext plywood, cut they to make a "floor" that was just a tab
larger then the fully assembled outer frame of the shed and plunked
the shed down on top of that plywood floor and run some screws around
the metal frame bottom into the ply wood. Last two I did are 15 years
and 25 years old and seem fine.
The new shed I bought came with a "free" floor "kit" (just add
plywood). This kit is just some metal cross pieces that will sit on
top of the sheds metal bottom frame on the edges and run across the
middle in a few places. So unlike past "floors" I've built which sit
on my Crushed stone base, this one will have the plywood sitting on
top of these metal cross rails and the bottom frame rail.
Doing it my way puts the plywood on top of the gravel with a more or
less uniform support under all of it and then the shed itself is
sitting on and attached to the TOP of the plywood. Using the floor
kit means the floor is on top of the frame rail and will only have
support where it sits on the cross rails and of course along the
In my mind I'm having a hard time seeing how using the floor kit is an
improvement over my old way and instead of the bottom frame having the
nice threshold in the door opening, like it does doing it my old way,
there will be the plywood sticking up there scrwed down to the top of
the threshold just as it will be scrwed down to the top of the bottom
frame all around the edges.
When I saw it came with a "free floor frame" I thought it would be a
full perimeter frame, not this interior kludge.