3.1301.2 Electrical, HVAC, Plumbing, Gas, Dryer Vent, and General Penetrations Through Flooring

Desired Outcome: 
Penetrations sealed to minimize air leakage and moisture movement between unconditioned and conditioned space; all repairs will maintain structural integrity
Work assessment

Installer prework assessment will be conducted to determine:

  • Structural integrity
  • Insect infestation
  • Pests
  • Accessibility
  • Plumbing leaks
  • Number, type, size, and location of penetrations

Ensure work space is safe and ready for air sealing

Verify scope of work

Floor air sealing (decking, subfloor, floor decking)

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 expected load

Ensure sealant is effective and durable

Sealant selection

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

Sealants will be compatible with all adjoining surfaces

Sealants will be continuous and meet fire barrier specifications, if required

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

Floor repair

Floor repair material will meet or exceed strength of existing floor material

Repair will span from joist to joist and blocking added as needed to support floor

Patches smaller than 144 square inches will not require repairs from joist to joist

Floor repair material will be glued, fastened, and air sealed

Ensure floor is structurally sound

Minimize air leakage

Structural materials

Materials will be selected to comply with manufactured housing rules and regulations (e.g., Manufactured Housing Institute)

Materials will be used or installed in accordance with manufacturer specifications

Select materials to ensure durable and permanent repair

High temperature application

Only noncombustible materials will be used in contact with chimneys, combustion exhaust vents, and flues

Prevent a fire hazard