One thing to keep in mind is that concrete will crack no matter how well the contractor seals it. Concrete is also susceptible to the freeze and thaw cycles thus creating damage associated with the temperature changes.
While some cracks do not create any problems, other cracks will allow moisture to come up through the cracks which can damage flooring. Aside from that, cracks are usually an issue when a homeowner is ready to either sell or purchase a home. If there are cracks in the foundation can reduce the value of your home. If you are the buyer, you don't want to have to worry about or deal with are cracks that could end up costing you money to repair or replace something. Having a home inspection will give you peace of mind to ensure that the home is structurally sound.
When there are cracks in the subflooring, this may result when the concrete slab becomes damaged, which usually is because of the presence of water. The first thing that you would need to do is find the source of the water and then remove the old flooring, seal the concrete and then have new flooring installed.
Cracks can also occur when there is no moisture; however, if there is any presence of water, it will find the crack and find its way up. If you have adequate drainage in your yard, you will be able to divert water away from the home which could delay damage to the cracks in the concrete subflooringâ€”perhaps even indefinitely.