Drainage, vapor barriers, and sump systems that keep the space under your home dry year-round. IICRC-certified pros serving Longmont with 40-minute average emergency response.
Response
40 min
Cost range
$1,500+
Duration
2d
Crawl space waterproofing stops the cycle of standing water, damp soil, and humid air under your home: drainage to move water out, a sealed vapor barrier to stop soil moisture, and dehumidification to control the air. Wet crawl spaces feed mold on joists, rot in subfloors, and musty air upstairs — waterproofing addresses the water at its entry point instead of treating symptoms above. If the space has standing water today, removal and drying come first, then the system that keeps it out.
Longmont context: Longmont sits along St. Vrain Creek, which catastrophically flooded in September 2013 in a once-in-a-millennium precipitation event causing over $150 million in damage to the city. The 2013 disaster reshaped Longmont's floodplain management, but elevated risk remains during intense late-summer rainfall on the Front Range. Hail storms striking Longmont from the northeast are a persistent secondary cause of roof damage and subsequent interior water intrusion.
Certified specialist calls within 15 minutes.
Quick answer
Crawl space waterproofing combines drainage and a sump system to move water out with a sealed vapor barrier and dehumidification to control what remains. Typical cost is $1,500–$9,000 over about two days. Waterproofing handles liquid water while encapsulation handles vapor and air — a chronically wet crawl space normally needs the drainage first. In Longmont, CO, local crews average a 40-minute response and area rates run $1,700–$9,500.
Not sure who to phone first? Who to call for water damage, in order.
Work follows IICRC S500. Typical duration 2 days; national cost range $1,500–$9,000.
Whether you hire a crew in Longmont or handle part of it yourself, these are the tools the job actually needs and the background worth reading first.
Local geography, climate, and housing stock all affect how water damage occurs in Longmont. These are the most common causes our certified teams respond to in this area.
Local Risk Notes
Southmoor Park and properties within the St. Vrain Creek FEMA floodplain were most severely damaged in 2013 and remain in a high-risk zone. Old Town Longmont has numerous properties with aging clay sewer laterals prone to root intrusion and backup during heavy rainfall events.
CO Insurance Tip
Longmont homeowners should check Boulder County's post-2013 updated FEMA flood maps, as many properties were reclassified into higher-risk zones requiring mandatory NFIP flood insurance through federally backed mortgage lenders.
No-Obligation Estimate
Serving Longmont, CO
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We connect you with pros available around the clock — nights, weekends, and holidays.
We only refer to restoration professionals certified under IICRC standards (S500, S520).
All referred contractors carry full state licensing and liability insurance.
Call anytime — triage help and contractor dispatch at no cost to you.
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HearthDry is an independent resource and does not perform restoration work. All referred contractors are independently licensed and IICRC-certified.
