less than 4" of porous fill under slab on grade
less than 4" of porous fill under slab on grade
(OP)
thanks for responding to last question. same job as unsupported wwf. I have now discovered that the porous fill under the slab is only 2" to 2 1/2" on average and as thin as 1" to 0" is a several locations as well 4" in a few isolated areas. My concern is that this could lead to more cracking. An easy solution is to just decrease control joint spacing or should I insist that the contractor remove the wwf, vapor barrier, gravel and adjust sub-grade to the correct elevation. The second option would delay the job and make everyone generally unhappy. I just don't want to cause this much if the increased risk of cracking is small.






RE: less than 4" of porous fill under slab on grade
RE: less than 4" of porous fill under slab on grade
RE: less than 4" of porous fill under slab on grade
In an analagous vein as "the die is cast", the slab is poured. What to do depends on the servicability impacts of extra cracking. Somebody needs to sit down and figure out what the most cost-effective option is - whether it's a new flooring choice to hide the cracking, or whether somebody wants to direct the contractor to redo the work.
Secondarily, whomever was responsible for ensuring that the subgrade was correctly graded may be on the hook for any extra costs (either way) over the original contract cost.
I hope that the aggregate base course was not intended to provide significant underdrainage for the slab, as that function may be impaired.
Good Luck!
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com
RE: less than 4" of porous fill under slab on grade
Thanks again
RE: less than 4" of porous fill under slab on grade
My apologies, I thought I read that the slab had already been poured. That'll teach me!
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com