#1  
Old 07-29-2010, 07:22 AM
Serf
 
Join Date: Jul 2010
Location: manchester, MA
Posts: 3
Default 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
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  #2  
Old 08-02-2010, 10:32 PM
Journeyman
 
Join Date: Jun 2009
Location: minnesota, usa
Posts: 472
Default 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?
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  #3  
Old 08-03-2010, 07:16 AM
Serf
 
Join Date: Jul 2010
Location: manchester, MA
Posts: 3
Default 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
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  #4  
Old 08-03-2010, 09:21 AM
Journeyman
 
Join Date: Jun 2009
Location: minnesota, usa
Posts: 472
Default Re: foundation slab

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