SEMCO field notes
Troubleshooting guides.
Prep, application and troubleshooting for basements, roofs, showers, pools and more, written by the team that makes SEMCO.
19 articles
comparisonWhy Does My Waterproofing Membrane Smell So Strong? Water-Based vs Rubber-Based Odor Compared
Waterproofing membrane smell explained: why water-based and rubber-based coatings smell different, how long odor lasts, and when it signals a real problem.
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basementIs Your Basement Waterproofing Membrane Actually Failing? 7 Warning Signs
Peeling, chalky white powder, or a musty smell after basement waterproofing? Here are 7 warning signs your coating is failing, and how...
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roofMetal Roof Leaking? How to Find and Seal It Before Winter Rain
Metal roof leaking when it rains hard? Here's how to find the real leak point and seal it yourself with a flexible...
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bathroomShower Waterproofing Membrane: What Actually Stops Leaks Behind the Tile
Grout isn't what stops a shower leak. See the 3 spots where showers actually fail, and how to waterproof them with a...
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basementIs Black Mold on Concrete Basement Walls Actually Dangerous? What to Check Before You Waterproof
Dark staining on a basement wall isn't always toxic black mold. Here's what CDC and EPA guidance actually says, how to check...
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troubleshootingWhy Some Waterproofing Membranes Smell So Strong (and How to Tell If It's Actually a Problem)
A strong tar or kerosene smell after waterproofing usually means an asphalt-based or rubberized coating was used. Here's what causes it, whether...
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troubleshootingWindow Leaking During Rain? How to Waterproof Windows From the Outside Without Replacing Them
A leaking window during rain rarely means a bad window. Here's how to waterproof it from the outside with a flexible membrane,...
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roofMetal Roof Leaking? The Real Reasons Coatings Fail (and How to Fix It for Good)
Metal roof still leaking after a coating job? Here is why fasteners, seams, and thin coatings actually fail, and how to stop...
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concretePool Deck Cracking Every Winter? How to Waterproof and Crack-Proof It for Good
Pool decks crack every winter for one repeatable reason: water gets into the concrete's pores and hairline cracks, freezes, expands, and pushes...
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basementBasement Waterproofing Membrane: How to Choose One That Won't Fail (2026 Buyer's Guide)
What to check before buying a basement waterproofing membrane: elongation, cure time, VOC, and cost per square foot. A 2026 buyer's guide.
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basementThe Hidden Dangers of Black Mold in Unfinished Basements: Health Risks and Structural Physics
An unfinished basement is not a passive storage space; it functions as an active biological reactor. Without a proper capillary break or...
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basementWaterproofing Your Basement with SEMCO Liquid Membrane: The Ultimate Guide to a Dry, Mold-Free Space
A damp, musty basement is more than just a nuisance—it’s a serious threat to your home’s value, indoor air quality, and structural...
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