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May 27, 2007 at 10:02 AM #55195May 29, 2007 at 11:30 AM #55390ibjamesParticipant
can someone elaborate on cracked slabs? I too would like to know why it is so bad. Is it because if the slab is cracked that means it could move more?
May 29, 2007 at 11:30 AM #55406ibjamesParticipantcan someone elaborate on cracked slabs? I too would like to know why it is so bad. Is it because if the slab is cracked that means it could move more?
May 29, 2007 at 12:02 PM #55395El JefeParticipantA cracked slab in itself is not that bad and can be repaired, but the reason it cracked could mean a lot of headaches.
Most cracked slabs are the result of poor soil compaction when the big developers push the hilltops into the valleys to make it easier to grade their lots. This is bad as there is not much that can be done, and the soil will continue to compact for many years if the original compaction was really bad. This is mostly confined to the early mass developslums of the 80’s & 90’s… think early carmel valley/carlsbad/lacosta.
Other reasons could be expansive soil, under slab erosion(busted pipe), creeping hillsides, not enough steel in the slab, and many others… all with different solutions of varying effectiveness.
In the end it’s buyer beware.
May 29, 2007 at 12:02 PM #55412El JefeParticipantA cracked slab in itself is not that bad and can be repaired, but the reason it cracked could mean a lot of headaches.
Most cracked slabs are the result of poor soil compaction when the big developers push the hilltops into the valleys to make it easier to grade their lots. This is bad as there is not much that can be done, and the soil will continue to compact for many years if the original compaction was really bad. This is mostly confined to the early mass developslums of the 80’s & 90’s… think early carmel valley/carlsbad/lacosta.
Other reasons could be expansive soil, under slab erosion(busted pipe), creeping hillsides, not enough steel in the slab, and many others… all with different solutions of varying effectiveness.
In the end it’s buyer beware.
May 29, 2007 at 12:11 PM #55397rubeParticipantI am a general contractor. ALL concrete cracks, it is a matter of how large the cracks(side to side movement) are and whether there is deflection(up/down movement) or not. generally cracks smaller than 1/8″ are normal. Larger cracks or areas showing deflection can indicate potentially very costly repairs.
Most of the time the cause movement due to poor soil preparation(not enough compaction or not accounting for expansive soil) prior to slab placement, but it could also be an insufficient slab design for the structure(worst case), or heaving due to tree root intrusion.
I have done slab repairs – they aren’t for the do it yourselfer. If you are looking at a property with cracks in the foundation you should hire an engineer to get a look at the slab/soil.
May 29, 2007 at 12:11 PM #55414rubeParticipantI am a general contractor. ALL concrete cracks, it is a matter of how large the cracks(side to side movement) are and whether there is deflection(up/down movement) or not. generally cracks smaller than 1/8″ are normal. Larger cracks or areas showing deflection can indicate potentially very costly repairs.
Most of the time the cause movement due to poor soil preparation(not enough compaction or not accounting for expansive soil) prior to slab placement, but it could also be an insufficient slab design for the structure(worst case), or heaving due to tree root intrusion.
I have done slab repairs – they aren’t for the do it yourselfer. If you are looking at a property with cracks in the foundation you should hire an engineer to get a look at the slab/soil.
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