• 1. Purpose

    Waterproofing is usually required by building codes for structures that are built at or below ground level. Waterproofing and drainage considerations are especially important in cases where ground water is likely to build up in the soil or where there is a high water table.

    Water in the soil causes hydrostatic pressure to be exerted underneath basement floors and walls. This hydrostatic pressure can force water in through cracks, which can cause major structural damage as well as mold, decay, and other moisture-related problems.

  • 2. Methods

    Several measures exist to prevent water from penetrating a basement foundation or to divert water that has penetrated a foundation:

    ● Interior wall and floor sealers
    ● Interior water drainage
    ● Exterior drainage
    ● Exterior waterproofing coatings
    ● Box type waterproofing
    ● Foundation crack injections.

  • 3. Causes of water seepage and leaks

    Water seepage in basement and crawl spaces usually occurs over long periods of time and can be caused by numerous factors.

    Concrete is one of the most commonly used materials in home construction. When pockets of air are not removed, or the mixture is not allowed to cure properly, the concrete can crack, which allows water to force its way through the wall.
    Foundations (footings) are horizontal pads that define the perimeter of foundation walls. When footings are too narrow or are not laid deep enough, they are susceptible to movement caused by soil erosion.

    Gutters and downspouts are used to catch rain water as it falls and to discharge it away from houses and buildings. When gutters are clogged or downspouts are broken, rainwater is absorbed by the soil near the foundation, increasing hydrostatic pressure.



Basement waterproofing involves techniques and materials used to prevent water from penetrating the basement of a house or a building. Waterproofing a basement that is below ground level can require the application of sealant materials, the installation of drains and sump pumps, and more.

Based on 13 reviews
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Adam SellorsAdam Sellors
00:54 25 Oct 23
My partner and I are converting our single family home into a duplex and we were lucky enough to come across Decc. Mike has been phenomenal throughout the permit process. We were a little stressed taking on this large project, but Mike has been amazing, guiding us through the trials and tribulations that arise when working on a home built in the 1800’s. He presented great ideas during his walk through, and designed two fabulous units, easily overcoming what we thought were going to be major permit issues. Further, Mike was able to put us in contact with a construction company (555 construction) that specialize in this type of conversion. We recommended Mike to some close friends, who also conveyed a very positive experience. Thank you Mike!!!!!!!
Vanessa MilichVanessa Milich
20:47 27 Sep 23
Very professional and knowledgeable. Work was completed on time with no surprises. I would highly recommend this company to everyone.
Chris FritchChris Fritch
14:46 11 Sep 23
I have now had the pleasure of working with Mike on a number of projects and I am absolutely thrilled to have found him. His professionalism, attention to detail and knowledge is unmatched in the industry.I have worked with many engineers in the past and Mike leagues above them. Can not recommend DECC INC. enough!
Craig BeckerCraig Becker
14:22 03 Sep 23
I have now had the pleasure of working with Mike a few times and picked his brain dozens more. Simply put there is levels to this kind of stuff and Mike is at the top of his game. His ability to adjust his message from talking to city staff to contractors to home owners is impressive and you feel like you have a true partner in your project. One of the most impressive aspects of working with DECC Inc. was their ability to deliver permit on the day of closing. There was zero downtime and the team was able to get right to work.Having worked with multiple engineers in the past, there is good and bad, Mike and DECC Inc. are the best.
Stuart FletcherStuart Fletcher
01:32 24 Aug 23
We felt Mike was very open and honest from beginning by to end. From drawings to permits, to putting together the team to help us. He came recommended from a friend and he did not disappoint. We would highly recommend!!!!
Michael MonsonMichael Monson
15:42 16 Aug 23
Mike and the team at DECC Inc. were an absolute pleasure to collaborate with. They were thorough, professional and provided the absolute highest quality of customer service from commencement to completion of the additional dwelling unit within my home. DECC Inc. essentially rescued me from a previously incompetent design firm and I cannot recommend their services highly enough. If I could rate 6 stars, I would.
fam ilyfam ily
18:58 20 Jul 23
I was referred to DECC Inc. to do drawings for my duplex conversion. Mike made the process easy and seamless with the various permit applications and submissions, along with drawings for my new property conversion. Great communication throughout the entire process, with updates along the way. We had our permits in hand the day our property closed, allowing us to start the conversion immediately with no time lost (time is money). Highly recommend Mike!