Originally Posted By: gbeaumont This post was automatically imported from our archived forum.
Hi to all,
Daniel, they are not control cracks, control joints have straight lines usualy 3/8 to 1/2 inch deep formed in the concrete when it is poured, these cracks look like the center of the garage floor being pushed up by expansive soils under the slab.
Originally Posted By: dhadler This post was automatically imported from our archived forum.
Agreed…I believe another possibility is not enough tamping after back filling around garage footings. The soil/gravel settles around the perimeter and add some weight from vehicles = cracking. You can usually tell if the perimeter concrete pad is settling by the original cement line from trawling at the base of the concrete knee wall.
I've seen control joints but none have looked like those. I'd say from the pictures those are good old fashioned minor cracking...which is very common in our area. 
-- Darrell Hadler
Five Star Home Inspections
Medicine Hat, Alberta CANADA
Originally Posted By: kmcmahon This post was automatically imported from our archived forum.
My thoughts are that they are cracks from where a control joint should have been placed. It happens on larger slabs without these joints.
There is a reason they put control joints in…to help with the expansion and contraction of the slab (to give it a place to crack). Without these joints you will get cracking that looks like your pictures above…uncontrolled.
Originally Posted By: dgiblin This post was automatically imported from our archived forum.
Thanks to all for there input. The builder and concrete contracter are meeting with the home owner on the 5th of April. I will let you know what they plan on doing to resolve this matter on this home that is less then 1 year old.
