Waterproofing your basement or foundation isn't an exact process, much less an exact science. There are numerous ways water can enter your home. Properly identifying these entry points and water sources isn't always easy. Finding a good waterproofing contractor is the best asset you have when combating water and moisture in your basement, but finding such a contractor is no gimmie, either.
Hiring Waterproofing Contractors
Checking references is never more important than when you hire a waterproofing contractor. Finding an experienced contractor will help assure you that he or she has "seen it all" and will be able to tackle any problem you may have. Always a good idea, it's especially important to sign a clearly stated written contract. You also shouldn't have to pay for the entire balance of the estimate upfront. That said, keep in mind unforeseen difficulties may arise. Hire the contractor you feel you can trust so the two of you can discuss and work the problem together.
Waterproofing Contractors: Diagnose the Problem
The first step in basement waterproofing is to identify the source of the water. This will almost always determine the necessary treatment and the cost of waterproofing. Here are some of the more common problems waterproofing contractors identify in homes they service:
Cracked WallsOften, concrete walls can crack over time. This is easier to detect and repair in unfinished basements. These cracks can be sealed from the interior and/or exterior depending on the situation, cost, and extent of the problem.
Water SeepageEven with seamless basement and foundation walls, excessive water can inundate the walls and building up hydrostatic pressure until water is "pushed" through the walls into your basement. This problem can usually be fixed simply by cutting off the water source caused by inadequate water diversion. Damaged gutters are common source of excess water. Water may also be coming from your yard, which may require the installation of French drain.
Below Grade FoundationsIf your yard or a new installation such as a driveway, causes the exterior grade to be raised above the foundation, water may start pouring into your basement. Often, lowering the exterior grade is not an option in this situation. An exterior membrane, essentially a glorified patch, is usually effective for this problem.
Communication with Your Waterproofing Contractor
Communication with any home improvement contractor is important, but it can especially so with waterproofing. The process can incorporate several different areas of your home, and you don't want to be in each other's way. Tension and frustration can result from an otherwise solid relationship. Naturally, you should be able to expect that your contractor will keep well informed of his or her work schedule, but you should attempt to accommodate the work in any reasonable way that you can. Discuss the protocol, for example, if you're not home when the work is being completed.
It's also a good idea to discuss ongoing plans for basement remodeling. If your contractor knows you're planning to finish your basement in the weeks ahead and some of the furnishing and fixtures you have planned for your basement space, it may affect the scope, strategy, and cost of your waterproofing. 
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