3.1402.1 Crawl Spaces—Sealing Floor Penetrations

Basements and Crawl Spaces
Crawl Spaces
Desired Outcome: 
Air leakage prevented and indoor air quality protected
Backing and infill

Backing or infill will be provided as needed to meet the specific characteristics of the selected sealant and the characteristics of the penetration

The backing or infill will not bend, sag, or move once installed

Ensure resulting closure is permanent and supports any load (e.g., insulation)

Ensure sealant does not fall out

Sealant selection

Sealants will be used to fill holes no larger than recommended by manufacturer specifications

Sealants will be compatible with their intended surfaces

Sealants will allow for differential expansion and contraction between dissimilar materials

Sealants will be continuous and meet fire barrier specifications, according to authority having jurisdiction

Create a permanent seal

Ensure sealant meets or exceeds the performance characteristics of the surrounding materials

High temperature application

Only non-combustible materials will be used in contact with chimneys, vents, and flues in accordance with authority having jurisdiction

Prevent a fire hazard