On Wed, 22 Apr 1998, Keith Kaplan wrote:
> On the back of my detached garage there's a kind of lean-to potting shed.
> The shed has three walls of its own (shares the garage wall for the fourth)
> its own door to the outside, and a dirt floor. The freestanding walls are
> standing on pier blocks. I've been thinking I could use this space as
> storage for extra sets of tires, and maybe I'll put my compressor there,
> etc. Before I do that, I'm thinking it might be nice to pour a slab in
> The books I've seen assume you're pouring the slab _before_ building
> anything on top of it, so I'm wondering if there are any special
> considerations I should know about. I won't be driving or parking cars in
> there, so I assume a 4" thick slab is sufficient.
More than enough. THree inches with some wire is enough for what you
> I'll just build forms at
> the outer edge of the walls to let the slab go under them. Obviously, the
> pier blocks will get cemented in place in the process, but that sounds like
> a good idea anyway, right?
Wrong!! You want everything to move around on its own -- and it will!!
Wrap expansion strips around everything.
> Also -- am I insane to consider mixing my own
> Quikrete for a 24'x8'x4" slab?
> load. Would I pour the slab in one piece, or would doing it in 2 or 3
> sections be easier? Should I put divider board between this new slab and
> the existing garage slab?
Sections -- and you want to put an expansion strip along the garage wall,
too. Use some scrap lumber to create quadrants. Do one at a time if you
can't do it all at once. You don't need to put expansion joints within
the quadrant, but do scribe the slab (like a sidewalk) so that any future
cracking is hidden.