Basements - Without Groundwater Leakage

Detail ID
4.0402.4
Topic
Conditioned Subspaces
SubTopic
Walls
Desired Outcome

Continuous, contiguous, moisture resistant, and safe thermal boundary that prevents air movement @ 50 Pascals

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MF
Specification Objective

Verify that installation area is free of:

active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

energized or undammed knob and tube wiring

uncovered electrical junctions

improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

insulation escape openings

Verify that installation area:

is intact, able to support insulation weight, and air sealed

has a sealed class I vapor retarder installed over all bare earth

has all bulk sources of moisture directed away from the subspace walls (i.e., gutters, flashing, grading, drainage)

Ensure space can be safely insulated

  • SF
  • MF
Specification Objective

Select insulation that has a flame spread/smoke development index of 25/450 or less when tested in accordance with ASTM E 84 or UL 723 and is not water absorbent

Fire safe and hydrophobic insulation selected

  • SF
  • MF
Specification Objective

Select sealants that:

are compatible with their intended surfaces

allow for differential expansion and contraction between dissimilar materials

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers)

are low volatile organic compound (VOC) sealants for use inside the pressure boundary that meet independent testing and verification protocols

Select safe and effective sealants

  • SF
  • MF
Specification Objective

Remove any incomplete or unsealed vapor barrier from the foundation wall

Prevent condensation

  • SF
  • MF
Specification Objective

Install insulation to prescribed R-value in full contact with the entire perimeter of foundation wall from ceiling to floor

If insulation has a vapor retarder on only one side install it facing the conditioned space

Contiguous and continuous thermal barrier

  • SF
  • MF
Specification Objective

Attach rigid or batt insulation with mechanical fasteners

Insulation remains in place

  • SF
  • MF
Specification Objective

Seal all seams, joints, connections, etc. of insulation on the conditioned side of the assembly, or install a sealed air barrier on the conditioned side of the insulation (e.g., drywall, luan)

Continuous air barrier on heated side of assembly

  • SF
  • MF
Specification Objective

If termite pressure exists, maintain a 3" inspection gap from the top of the insulation to the bottom of any wood

Allow for termite detection

  • SF
  • MF
Specification Objective

Separate all foam products from living space with a thermal barrier material (e.g., 1/2" gypsum wallboard) as specified by applicable building code

If space is used only for the service of utilities, foam will be separated from the space using a suitable ignition barrier covering or coating according to manufacturer's specifications

If space is used for storage or occupancy, foam will be separated from the space using a thermal barrier material (e.g., 1/2" gypsum wallboard) as specified by applicable building code and manufacturer specifications

If code requirements are unclear, consult local code officials for clarification

Minimize ignition and combustion potential

  • SF
  • MF
Specification Objective

Post a dated receipt signed by the installer that minimally includes: Installed insulation type, coverage area, installed thickness, and installed R-value

Comply with 16 CFR 460.17 and document contract compliance

View Sub-Topic:
Walls