3.1301.1 Electrical, HVAC, Plumbing, Gas, Dryer Vent, and General Penetrations Through Bottom Board

Topic: 
Floors
Subtopic: 
Penetrations
Desired Outcome: 
Penetrations sealed to minimize air leakage and moisture movement between unconditioned and conditioned space
TitleSpecification(s)Objective(s)
3.1301.1a
Work assessment

Installer prework assessment will be conducted to determine:

  • Structural integrity
  • Standing water
  • Raw sewage
  • Insect infestation
  • Pests
  • Accessibility
  • Number, type, size, and location of penetrations

Ensure work space is safe and ready for air sealing

Verify scope of work
3.1301.1b
Soft bottom board repair

Patching material will be provided as needed to meet the specific characteristics of the bottom board material and the characteristics of the hole

Patch will have a service life of a minimum of 20 years

Minimize air leakage

Keep insulation in place

Ensure repair materials are compatible

Ensure patch will support insulation
3.1301.1c
Hard bottom board repair

Patching will be provided as needed to meet both the specific characteristics of the bottom board material and the characteristics of the hole

Patch will not bend, sag, or move once installed

Patch will be permanent

Minimize air leakage

Ensure repair materials are compatible

Minimize hole size to ensure successful use of sealant

Ensure closure is permanent and supports insulation

Ensure sealant does not fall out
3.1301.1d
Bottom board penetrations

Combustion air supplies will be labeled for identification and will not be blocked or sealed

Penetrations will be sealed to meet both the specific characteristics of the bottom board material and the characteristics (hole size and type) of the penetrations (e.g., electrical, PVC, gas line, dryer vent)

The patch will not bend, sag, or move once installed

Ensure combustion equipment is not compromised

Minimize air leakage around penetrations
3.1301.1e
Materials

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

Surface preparation and material selected will be used or installed in accordance with product manufacturer specifications

Select materials to ensure durable and permanent repair