The most expensive, as well as the most effective, can require extensive excavation.
Interior-based waterproofing methods involve moving out water that's inside the home.
Fixing a water problem from the inside may be a cheaper option, especially in cases where exterior work isn't possible.
Drain: This system moves water out of the house through a hole or trench in the foundation, paired with a sump pump. Such a system should also include insulation of basement walls, with a vapor barrier to protect against condensation.
Drainage systems start $2,000.
Sealants: Some highly rated waterproofing companies don't recommend sealants because they say they fail too easily. The cost of a sealant-based waterproofing project may range from $4 to $8 a square foot.
Epoxy injection: This option is not always favored because it may provide only a temporary solution to fill cracks in poured-concrete walls.
Epoxy injections can start at $300.
Exterior waterproofing projects are sometimes called "positive side" jobs because the aim is to prevent water from getting in.
Excavation: Many contractors consider installing an underground trench or perimeter drain to be the most effective method, if done correctly.
However, the average range for an excavation job is $20,000 to $30,000, and can be as high as $80,000, depending on how accessible the targeted areas are, how much digging is required and how much landscaping or other work must be restored.
Sodium bentonite: Some waterproofing contractors don't like this method of adding a clay material to the dirt around the home to fill cracks and absorb water since the clay can clog outdoor drains.
Costs for this method start around $500.
First try the simplest solutions, such as making sure gutters are free of debris, downspouts are moving water 20 to 30 feet from the foundation and the property slopes away from the foundation. of the house.
In addition to using a trusted online site to review local consumers' experiences, consider contractors who belong to the Basement Health Association, a trade organization that offers certification and continuing education.
Also, get multiple bids, check references and make sure that the company you hire is properly licensed, insured and bonded.
Angie Hicks is the founder of Angie's List, a resource for local consumer reviews.© 2014 www.angieslist.com/
More Home and Garden Headlines
Home & Garden calendar What I'm thankful for in the garden and out of it Go pro on your interior design with Homepolish Plant of Merit: Physalis alkekengi Kate Spade, of fashion fame, launches home furnishings brand Use your garden to bring holiday cheer inside Gardening events in Snohomish County and nearby Pilgrims learned, with lots of help, to survive and give thanks
Our to-do list full of ideas for your weekend
Our new comment system is not supported in IE 7. Please upgrade your browser here.