Red Bank · checked Nov 13, 2026

Crawl space work in Red Bank

Red Bank enforces the 2018 International Residential Code, so a sealed crawl space there is held to the code's R408.3 rules.

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Code and permits

The City of Red Bank Building Department says it enforces the 2018 International Residential Code and International Building Code and the 2020 National Electrical Code, with permits through an online portal.

What R408.3 means for encapsulation

Under the 2018 IRC, an unvented crawl space needs a continuous Class I vapor retarder with seams overlapped 6 inches and sealed, edges at least 6 inches up the wall, and one drying method: a small exhaust fan (1 cfm per 50 sq ft), conditioned supply air (1 cfm per 50 sq ft), or a dehumidifier sized at 70 pints a day per 1,000 sq ft.

Climate

NOAA's Chattanooga airport records show average relative humidity of 85% at 7 a.m. and 55% at 1 p.m. over the year, and about 55 inches of rain a year (1991-2020 normals). The EPA recommends indoor humidity below 60%.

Licensing and radon

Residential jobs from $3,000 to $24,999 in Hamilton County need a Tennessee Home Improvement license or a full contractor license. Red Bank is in EPA radon Zone 2; TDEC offers free test kits.

Services

• Encapsulation
• Vapor barrier
• Dehumidifier
• Mold and musty smell
• Standing water and drainage
• Sagging floors and support jacks
• Insulation
• Inspection
• Cost guide
• Permits and rules
• Comparing quotes