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    Exterior Waterproofing Experts

    4.7 (37 reviews)
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    Updated over 3 months ago

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    Darien T.

    Evan and the onsite service team, led by Santiago, were fantastic. I would not trust anyone else to address my exterior drainage and landscaping issues. We live in DC and have a sump pump that exits our basement into our backyard. Over time, poor drainage, the sump pump outflow exit location, and a few other poorly executed landscaping design issues (put in place by the previous owner) rendered our backyard and side yards useless. Evan was quick to diagnose the root causes of each issue in each location and went above and beyond in his suggestions for remedies. His proposed solutions were functional and creative - he knows his stuff! His pricing was fair for the work scope as well, IMO. Santiago and team were excellent. They arrived timely and worked insanely hard. Further, they were so clean in their work. The hosed down and blew out the workspace after they finished each job in each space - this was very much appreciated. In addition, Santiago and crew went above and beyond my expectations in that they used leftover mulch to touch up a few beds not originally contemplated in the initial scope of work. Finally, upon final inspection, we noticed a few very minor items requiring additional follow up. Evan agreed to address each issue and sent his crew the same day to fix. I couldn't be happier with their work and hopefully, the pictures do their craftsmanship more justice than this review.

    All issues identified in my previous review, and more, were satisfactorily resolved
    Peter T.

    Update on my previous review: Evan reached out immediately to let me know that the sprinkler had actually been fixed behind the scenes- which I quickly confirmed to be the case, leaving me a bit embarrassed. In response to some of the photos, Evan also personally came out to inspect the work, and recommended a few improvements including adding sod and re-doing the pop-up top area. The follow-up work was completed promptly and went well beyond my initial ask of fixing the sprinkler head... Evan even threw in some mulch for some of the sad-looking trees. To summarize: 1. Did they solve my drainage issues? Yes 2. Did they do this without introducing new problems? There were a few minor issues, described in my previous review 3. Did they follow up or resolve the problems they introduced? All issues I raised, and some I didn't, were acknowledged and fully fixed to my satisfaction. The sprinkler issue I had not heard back on had actually been fixed by the time I wrote my review (and I just didn't know it) 4. Would I use them again or recommend them to a friend? Unreserved yes (I am having Evan give me an estimate for an egress window this week) 5. For the price, am I happy with their work? 5 out of 5

    Niki W.

    Evan and his team did an amazing job. I noticed I had water coming into my basement this summer. After conducting a lot of research I contacted Exterior Waterproofing Experts; a division of Clifton Contracting. Evan came out to asses the damage and determine the cause. He thought he found the issue, but did advise he wasn't 100% sure, but wanted to start with the first plan as it was much cheaper and did not want to unnecessarily overdue what would be needed. I appreciated his honesty. Unfortunately, the initial resolution did not correct the problem. After re-contacting Evan we determined a full excavation would be necessary. The project was slated for 2 days and the team was great. They worked diligently on the first day and were having trouble finding the cause of the leak. They refused to leave until they found it and right before it got real dark and after digging probably 12 feet, they found that the entry was at the very bottom of my foundation where it met the ground and poured footing. Even better was that Evan through in additional buried drainage on my neighbors simply because it was in the best interest of our property to keep away further water erosion next to the foundation. This was not part of the original project quote. My neighbor's yard and mine were completely torn up. But I knew that the contract stated they would be everything (plants, shrubs, landscaping, etc.) back as it was before the work so I had my fingers crossed. After the team completely all the necessary restoration work on the second day, their clean up work was immaculate. You could not tell that it looked anything like it did before. The work was extra hard due to heavy clay soil and the depth that it took to find the damage, but the guys were great and got it all completed in the planned 2 days.

    Evan's team at work
    Ashleigh P.

    These guys were the light at the end of a several year tunnel of our basement stairwell drain getting overwhelmed and flooding in our home. We had rigged a very unsightly tarp/plywood contraption to keep the water our thinking the cost of a permanent solution would be out of reach right now. Wrong! We were so shocked at the fast and affordable estimate we received. Evan assured us they had done dozens of stairwell projects just like ours. He worked quickly to come up with a solution and the price tag was about 1/5 of what we had in our heads for a solution. A few days after the job was done (removed existing drain, installed a basin and 4" pipe running 35 feet graded down to the corner of the property) we had a series of torrential down pours day after day. And the drain held! No water in the basement! I can sleep at night now not worried about our basement flooding and I'm not embarrassed to have neighbors see our stairwell previously covered in a very ugly lean to contraption. Highly recommend Evan and his team.

    Drywell Hole Dug
    Joe M.

    I am thrilled with the job Exterior Waterproofing Experts did! I was required by my city to install a drywell in my front yard. Evan came by and gave a reasonable estimate and promised his team would have my yard looking perfect afterward. The team showed up exactly on time. They were friendly and knew what they were doing. The project went extremely smooth. I was surprised to see when they finished they spread grass in the areas where the yard had been damaged - that was going above and beyond! Overall I was very happy with the entire project and the quality of their work. If I have another drainage project there wouldn't be anyone else I would call.

    James L.

    Evan and his crew came out to even out the grade in our front and back yard. Evan gave me a great price for the work. They removed existing plants, added dirt, fixed the grade, added plants, and added mulch. His crew was on time and hard working. Highly recommend!

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    Ask the Community - Exterior Waterproofing Experts

    Review Highlights - Exterior Waterproofing Experts

    “Evan and his team did an incredible job fixing a water issue we had for nearly 10 years in our Alexandria Verizon Retail location.”

    Mentioned in 24 reviews

    Read more highlights

    Triad Basement Waterproofing

    Triad Basement Waterproofing

    (29 reviews)

    It's easy to give a company a good review right after they finish a job. I think you learn a lot…read moremore about a company when you call them 12 years later with a problem. Triad Basement Waterproofing originally did work at our Gaithersburg home about 12 years ago. Recently, we discovered that the drain from that original system had clogged and our sump pump had also stopped working. I reached out to Triad and was honestly impressed with how quickly they responded. Within about 12 hours I had heard back from them, and Justin was at our house the following day. He replaced the bad sump pump and made sure everything was working properly. He then returned on Monday to replace the clogged drain. Justin was fantastic. What really stood out was his attention to detail. He was extremely thorough, took pride in what he was doing, and cleaned everything up so well that the area was spotless when he left. But the biggest reason I'm writing this review is that Triad stood behind basement waterproofing work they had done more than a decade ago. There was no runaround and no trying to avoid responsibility. They simply took care of the problem. After 12 years, that kind of service says a lot about a company. I wouldn't hesitate to recommend Triad to anyone looking for basement waterproofing or sump pump work in the Gaithersburg area.

    Triad Basement Waterproofing recently installed a Basement Relief System to address water pressure…read moreand flooding beneath my basement floor and behind walls during heavy rains. Mike DeGirolamo - the owner - during his assessment provided step-by-step explanation of what needed to be done to address this issue. He was very thorough and clear in his explanations. He did not try to 'upsell' or include items that were not necessary. Prior to work starting a timeline was provided. Timeline detailed team arriving over the course of 3 days and what to expect during this time. The Triad team - Michael, Justin and Roberto - arrived as scheduled on their assigned days. Before starting work for that day they again went over every detail of what they would be doing. Master plumber Justin Dorrier was amazing in his handling of the plumbing side of this process. His attention to detail and explanations clearly showed his professionalism and knowledge as a master plumber. I did much research and obtained multiple estimates from about 5-6 different waterproofing companies before selecting Triad. Triad was by far the company I was most impressed with. I highly recoommend Triad Basement and Waterproofing if you have any waterproofing needs. They are all (Mike, Tracey, Michael, Justin and Roberto) true professionals at what they do and were a pleasure to work with --- I wish I could give them 10 stars! Thank-you Triad Team!

    DMV Foundation Solutions

    DMV Foundation Solutions

    (7 reviews)

    Seminary Hill

    It was a pleasure to work with DMV Foundation Solutions & they truly provided high-quality customer…read moreservice. From the initial phone call with Logan, to the consultation with Yos, they listened to our concerns/requests & communicated things clearly. Yos was punctual, friendly, and efficient in his evaluation. He generated a detailed report outlining his professional opinion regarding minor cracks in our poured concrete foundation wall & even provided recommendations for preventative maintenance. Five stars!

    Late in the summer of '24, we started to see a few cracks developing in our home. No big deal -…read moreit's 70+ years old, cracks happen. And then they kept happening, getting larger and spreading throughout the entirety of the house, and we could no longer open the doors in the basement and 1st floor on the south side of the house. Alarmed, I called a civil engineer and had an assessment done. They ascertained our house was sinking, particularly in one corner, and recommended ~30 push piers around the perimeter and up the centerline of the house... for over $100k. I literally laughed at him and asked him who he thought I was that he thought I could afford that. I called a few other places and got questionable assessments, and then I spoke with Yos from DMV. What a breath of fresh air. He was personable and honest. He recommended we get a 3rd party civil engineer to produce a report with drawings that I could use for any foundation company - even if I didn't go with DMV. We (finally, after a loooong delay on the civil engineer's part) got the report and drawings, and Yos and his team began work in early January to install ~10 helical piers on the sinking corner of the house. It was a pretty invasive project, but his team was fantastic. Fast forward 5 months and the cracks have stopped appearing, with a number of them even closing. We are very satisfied with the work DMV did for us, and are particularly pleased with their honesty. Where one company tried to sell us an overkill solution for six figures, Yos was upfront and told us what we really need - to address that affected area and revisit others if they end up being an issue - for roughly a quarter of the other company's price. That sort of honesty and pricing earns a permanent spot in my trusted contractor list.

    Premium Drainage & Erosion Solutions

    Premium Drainage & Erosion Solutions

    (54 reviews)

    If I could give this company 10 stars, I would…read more I hired Premium Drainage to correct a drainage issue that was caused by a previous landscaping installation. My sump pump discharged a significant amount of water, which created ice on the street during the winter and damaged my lawn. I also asked them to address a small uneven area around my sprinkler system. The team explained that they would regrade the area, use my existing soil, and plant grass seed, which I was completely comfortable with. They completed the entire project in just one day. At the end of the day, they sent photos of the finished work to the owner. Although I thought everything looked great, the owner wasn't satisfied with the appearance of the hay covering the newly seeded area. Even though installing sod was outside the original scope of work and would have been a much more expensive solution, he decided to go above and beyond. The very next day, he sent his crew back with fresh topsoil and sod at no additional cost. They added topsoil around my home to improve the grading and ensure water would drain away from the foundation. They even moved my stacked firewood, added topsoil underneath it, and carefully put everything back in place. When they finished, they watered all of the new sod, adjusted my sprinkler heads to ensure proper coverage, and thoroughly cleaned up the work area. My yard honestly looks better now than it did before they started. Premium Drainage was not the cheapest quote I received, but they were also not the most expensive. What set them apart was their professionalism, attention to detail, and commitment to doing the job right. I would absolutely recommend this company to anyone looking for drainage work or landscaping improvements.

    I wanted to express my gratitude with Premium Drainage and Adrian for doing such a wonderful job…read morewith our first home! He was easy to contact and came to our home to provide a free estimate of our project. I really appreciate that he listened to our ideas but also gave his professional opinion on changes we could do. The process of scheduling to receiving the invoice to then getting the work completed was seamless. We had our driveway changed from asphalt to concrete as well as expanded. We also expanded our patio and added a concrete pathway from the front to the back of the house. Then we had a retaining wall built and had some drainage issues resolved. Lastly, we had flagstones added to the concrete. Adrian and his team not only did a wonderful job but went above and beyond to make our home look beautiful. I would recommend them to anyone looking for work done and plan to use them for future problems!

    Exterior Waterproofing Experts - waterproofing - Updated October 2026

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