Learn why rain-related wall and window leaks should be assessed as part of the above-grade building envelope before choosing sealant, paint, or repairs.
Balcony Waterproofing or Recoating? How to Plan the Right Repair
Understand the difference between maintenance recoating and balcony waterproofing repairs, including warning signs and questions to ask before approving work.
Above-Grade Building Envelope Leaks: 5 Warning Signs for Los Angeles Properties
Five warning signs that help Los Angeles property owners recognize above-grade envelope issues and plan a diagnostic assessment before repairs.
When testing is worth it
Consider testing when any of the following apply: You can’t find the source (hidden leaks/attic/inside walls) but occupants have symptoms — targeted testing can help locate hidden contamination. Legal/insurance/real-estate reasons — to document conditions before/after...
Fast overview — the three most reliable tests
In-situ RH probes (ASTM F2170) — best for concrete slabs; measures internal relative humidity. Calcium-chloride MVER (ASTM F1869) — measures moisture vapor emission rate from the slab surface (useful for adhesives/finish acceptance). Moisture meters (pin and pinless)...
What inspectors check (quick list)
Visual signs: stains, efflorescence, blistering paint, soft or spongy materials, mold/mildew odors. Non-invasive scans: infrared/thermal imaging to spot temperature anomalies that often indicate moisture behind surfaces. Moisture meters: pinless (surface/near-surface)...
Who’s commonly responsible
Tenant — if the leak comes from something they installed or caused (appliance hookup, clogged drains, negligence). Unit owner / homeowner — if the leak originates inside their unit/house (internal plumbing, water heater inside the unit). Neighbor / adjacent unit owner...
How to detect water intrusion — signs, tools, and what to do next
Water intrusion starts small and often hides where you least expect it. Catching it early saves money, prevents mold, and avoids structural damage. Below is a straightforward, step-by-step guide showing how to detect water intrusion in homes, condos, and commercial...
What is a water intrusion inspection?
A water intrusion inspection is a focused, systematic evaluation of a building’s exterior envelope and assemblies to find where unwanted water is entering, how it’s traveling through the structure, and how much damage or moisture has accumulated. It’s about diagnosing...
What does a moisture map look like? — A clear, visual guide for Los Angeles property owners
When a building is wet where you can’t see it, a moisture map turns mystery into a clear plan. Exterior Systems Construction—who provide water intrusion testing and moisture-mapping services for Los Angeles HOAs, property managers, and homeowners—uses moisture maps as...