4.1402.3 Basement Wall Insulation—Groundwater Leakage

Topic: 
Basements and Crawl Spaces
Subtopic: 
Basements and Crawl Space Walls
Desired Outcome: 
Basement insulation improves thermal performance and ensures sufficient drying potential
TitleSpecification(s)Objective(s)
4.1402.3a
Drainage

A continuous drainage plane at the interior surface of the exterior basement wall will be created from the top of the wall to a drainage field at the bottom of the wall or sub-slab

Drainage field will be run to daylight or pumped to the outside

Remove moisture on the surface of the exterior basement wall

4.1402.3b
Rough finish walls (e.g., rubble walls)

Drainage plane will be replaced with a waterproof membrane

Only a non-absorbent insulation that complies with ASTM ASTM ASTM International, www.astm.org C665-06 will be applied

Insulation will adhere to the waterproof membrane without voids

Drainage field will be run to daylight or pumped to the outside

Create an air and moisture barrier on the interior side of the exterior basement wall and allow the insulation to conform to the irregularity of the surface

Improve thermal performance of the basement and the living space

4.1402.3c
Thermal barrier, insulation

A non-absorbent insulation will be used with a minimum expected service life of 10 years

A fire-rated material will be used if the insulation is left exposed

Improve thermal performance of the basement and the living space

4.1402.3d
Location

Insulation will be installed continuously from the top of the band joist to the top of the slab

Maintain a continuous thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow on the interior side of the exterior basement wall

4.1402.3e
Termite protection

Where termite pressure exists, if sub-slab drainage is installed, termite treatment will be performed before re-installing the slab

Provide termite protection

4.1402.3f
Insulation attachment

Insulation will be attached with a durable connection equal to or better than the manufacturer specifications, whichever is more durable

A minimum expected service life of 10 years will be ensured

Secure thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow without compromising the insulation

4.1402.3g
R-value

Regional IECC IECC International Energy Conservation Code will be followed for required R-value

Improve thermal performance of the basement and living space

4.1402.3h
Sealing

A continuous air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary on the warm side of the thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow will be installed, including floor-to-wall and wall-to-ceiling connections

Prevent convective air leakage from the basement, through the drainage plane, and back into the basement

4.1402.3i
Finish wall requirements

IRC IRC International Residential Code will be followed for finished wall details in basements

Install a durable, finished wall

4.1402.3j
Onsite documentation
A dated receipt signed by the installer will be provided that includes:
  • Coverage area
  • Thickness
  • R-value

Document job completion to contract specifications

Confirm amount of insulation installed

Comply with 16 CFR 460.17

TitleSpecification(s)Objective(s)
4.1402.3a
Drainage

A continuous drainage plane at the interior surface of the exterior basement wall will be created from the top of the wall to a drainage field at the bottom of the wall or sub-slab

Drainage field will be run to daylight or pumped to the outside

Remove moisture on the surface of the exterior basement wall

4.1402.3b
Rough finish walls (e.g., rubble walls)

Drainage plane will be replaced with a waterproof membrane

Only a nonabsorbent insulation that complies with ASTM ASTM ASTM International, www.astm.org C665-06 will be applied

Insulation will adhere to the waterproof membrane without voids

Drainage field will be run to daylight or pumped to the outside

Create an air and moisture barrier on the interior side of the exterior basement wall and allow the insulation to conform to the irregularity of the surface

Improve thermal performance of the basement and the living space

4.1402.3c
Thermal barrier, insulation

A nonabsorbent insulation will be used with a minimum expected service life of 10 years

A fire-rated material will be used if the insulation is left exposed

Improve thermal performance of the basement and the living space

4.1402.3d
Location

Insulation will be installed continuously from the top of the band joist to the top of the slab

Maintain a continuous thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow on the interior side of the exterior basement wall

4.1402.3e
Termite protection

Where termite pressure exists, if subslab drainage is installed, termite treatment will be performed before reinstalling the slab

Provide termite protection

4.1402.3f
Insulation attachment

Insulation will be attached with a durable connection equal to or better than the manufacturer specifications, whichever is more durable

A minimum expected service life of 10 years will be ensured

Secure thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow without compromising the insulation

4.1402.3g
R-value

Regional IECC IECC International Energy Conservation Code will be followed for required R-value

Improve thermal performance of the basement and living space

4.1402.3h
Sealing

A continuous air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary on the warm side of the thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow will be installed, including floor-to-wall and wall-to-ceiling connections

Prevent convective air leakage from the basement, through the drainage plane, and back into the basement

4.1402.3i
Finish wall requirements

International Residential Code ( IRC IRC International Residential Code ) will be followed for finished wall details in basements

Install a durable, finished wall

4.1402.3j
Onsite documentation
A dated receipt signed by the installer will be provided that includes:
  • Coverage area
  • Thickness
  • R-value

Document job completion to contract specifications

Confirm amount of insulation installed

Comply with 16 CFR 460.17