Spider Cracks In Garage Foundation And Concrete Ramp Up Into Garage - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 08-29-2010, 10:30 AM   #1
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spider cracks in garage foundation and concrete ramp up into garage

will concrete sealant stop existing spider cracks from spreading and getting wider. this driveway and garage are only 3 months old
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Old 08-29-2010, 10:48 AM   #2
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Unfortunately, No. It sounds as if the installing contractor poured the concrete on a very hot day with no provisions to prevent shrinkage cracks.

Provisions against shrinkage cracks include: placing a vapor barrier (plastic)on top of the concrete to prevent excessively rapid drying and keeping this membrane wet; installing a double coating of surface sealer while the concrete is curing; saw cutting the control joints within a few hours rather than the next day; pouring in the early morning; buying a special concrete mix to prevent rapid drying; etc.

There are a lot of things which can be done to avoid shrinkage cracking, which is what I think you have since you call them spider web cracks. Your only solution now is to make the contractor break it out and re-pour the entire slab.
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