The white substance on your walls is called efflorescence. This is the breakdown of the bonding agent used to hold your foundation together. The water that is penetrating the foundation is breaking the bonding agent down.
Basements can leak for various reasons. The weeping tile that surrounds most homes could be plugged, causing water to build up around the house. The foundation may need to be waterproofed stopping any water from penetrating the concrete or block wall. Or you could have cracks in the foundation wall letting water into the basement.
Yes. Under certain circumstances you could do an interior repair. This is typically by either a crack injection or an interior perimeter tile system. Our belief is that an exterior repair is always best, where possible. An exterior repair stops the water from ever touching the bare foundation wall. Where an interior repair allows the water to penetrate the wall then redirects it to an interior drainage system.
It all depends on how serious the problem is and what needs to be done to rectify the problem. Our estimates are free of charge and completed by experienced tradesmen not salesmen.
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At BEST Plumbing and Drainage Contractors, we feel it's important to help homeowners understand the role of the contractor and the various construction solutions available for each unique plumbing, wet basement repair and drainage issue. We are more than happy to consult with you and help navigate the process.