Specification History

SWS Version Created Specification ID Title Specification Objective Rationale Status
Version 2025 05/15/2025 - 12:29 2.0401.1c Material Selection

Select flexible Class I vapor retarder of 0.1 perm or less (e.g., 6 mil or 3 mil cross-laminated)

When the space is used for storage or entry is required for maintenance of utilities, heavier gauge sheeting or a protective covering (such as rubber roofing membrane) shall be installed in these areas.

Select appropriate and durable material for all spaces

 The specification was modified for improved alignment with a similar specification while ensuring flexibility for future materials to meet this specification. Red Line
Version 2020 08/14/2020 - 21:39 2.0401.1c Material Selection

Select flexible membranes that are a minimum of 6 mil (0.15-mm) polyethylene or equivalent flexible material

3 mil (0.08-mm) thickness is permitted if a cross-laminated product is selected

When the space is used for storage or entry is required for maintenance of utilities; heavier gauge sheeting or a protective covering (such as rubber roofing membrane) shall be installed in these areas

Select appropriate and durable material for all spaces

 Black Line
Version 2020 08/14/2020 - 21:39 2.0401.1c Material Selection

Select flexible membranes that are a minimum of 6 mil (0.15-mm) polyethylene or equivalent flexible material

3 mil (0.08-mm) thickness is permitted if a cross-laminated product is selected

When the space is used for storage or entry is required for maintenance of utilities; heavier gauge sheeting or a protective covering (such as rubber roofing membrane) shall be installed in these areas

Select appropriate and durable material for all spaces

 Black Line
Version 2020 08/14/2020 - 21:38 2.0401.1c Material Selection

Select flexible membranes that are a minimum of 6 mil (0.15-mm) polyethylene or equivalent flexible material

3 mil (0.08-mm) thickness is permitted if a cross-laminated product is selected

When the space is used for storage or entry is required for maintenance of utilities; heavier gauge sheeting or a protective covering (such as rubber roofing membrane) shall be installed in these areas

Select appropriate and durable material for all spaces

 Black Line
Version 2020 08/14/2020 - 21:37 2.0401.1c Material Selection

Select flexible membranes that are a minimum of 6 mil (0.15-mm) polyethylene or equivalent flexible material

3 mil (0.08-mm) thickness is permitted if a cross-laminated product is selected

When the space is used for storage or entry is required for maintenance of utilities; heavier gauge sheeting or a protective covering (such as rubber roofing membrane) shall be installed in these areas

Select appropriate and durable material for all spaces

 Black Line