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Clive Hughes 07-29-2010 06:22 AM

foundation slab
Im confused by the instruction for 5.5" base. If I add 3.5" pea gravel it only leaves " for concrete and rebar. Am I missing something? Clive

splatgirl 08-02-2010 09:32 PM

Re: foundation slab
Hi and welcome!
Set your formwork so that you have 5.5" of board above the level of the gravel. Assuming you use 2 x 6's for the form, they should be more or less just touching the gravel bed for a 5.5" thick slab.
Does that answer your question?

Clive Hughes 08-03-2010 06:16 AM

Re: foundation slab
Thx yes makes sense. Although 30 bags of mix at 0.5 cu.ft.per bag, over the base area of 42 sq.ft only has a depth of 4.25". Thx again. Clive

splatgirl 08-03-2010 08:21 AM

Re: foundation slab
IIRC, mine took 38 bags. Your problem was that you bothered to do the math :)
Good luck!

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