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Posted by RicodJour on June 13, 2008, 1:48 pm
> The floor of a 12x16 shed is PT 2x6 on top of a PT 2x8 mudsill. The botto=
m
> of the floor frame varies from 6" to 12" above the ground due to a ground
> slope. The mudsill is on solid concrete blocks. The decking is 3/4 ACX.
>
> Do I need to seal the underside of the ACX with thompsons water seal or
> something similar? I've read a couple of differing opinions that floors
> will rot from underneath.
Here's what the NY Code (a minor variation of the IRC) has to say
regarding the first question:
=A72304.11.2.1 Joists, girders and subfloor.
Where wood joists or the
bottom of a wood structural floor without joists are closer than
18
inches (457 mm), or wood girders are closer than 12 inches (305
mm), to
the exposed ground in crawl spaces or unexcavated areas located
within
the perimeter of the building foundation, the floor assembly
(including
posts, girders, joists and subfloor) shall be of naturally durable
or
preservative-treated wood.
AC plywood is not naturally durable.
> Also, is it required to put a layer of stone under the frame? I packed
> gravel under the concrete blocks but not the entire width/length of the
> floor frame.
>
> Thank you for your time.
I'm not sure I understand your shed construction - it sounds like the
foundation consists of some block sitting on gravel, which wouldn't
pass inspection around here. Under a certain size the requirements
are as stringent but when you go above that size you have to comply
with the standard requirements of the building code.
It would be cheap insurance to put down a layer of plastic under the
shed and cover it with gravel.
R
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