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// CODE SNIPPET

C402.2.7 Airspaces

Energy Conservation Code 2018 of Maryland > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.2 Specific Building Thermal Envelope Insulation Requirements (Prescriptive) > C402.2.7 Airspaces
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Where the thermal properties of airspaces are used to comply with this code in accordance with Section C401.2, such airspaces shall be enclosed in an unventilated cavity constructed to minimize airflow into and out of the enclosed airspace. Airflow shall be deemed minimized where the enclosed airspace is located on the interior side of the continuous air barrier and is bounded on all sides by building components.

Exception: The thermal resistance of airspaces located on the exterior side of the continuous air barrier and adjacent to and behind the exterior wall-covering material shall be determined in accordance with ASTM C1363 modified with an airflow entering the bottom and exiting the top of the airspace at an air movement rate of not less than 70 mm/second.

Related Code Sections


C402.2.7 [CE] Commercial Energy Efficiency, Airspaces
Where the thermal properties of airspaces are used to comply with this code in accordance with Section C401.2, such airspaces shall be enclosed ...
Energy Conservation Code 2018 of Maryland > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.2 Specific Building Thermal Envelope Insulation Requirements (Prescriptive) > C402.2.7 Airspaces
722.4.1.3 Fire and Smoke Protection Features, Multiwythe Walls With Airspace
Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined by the formula ...
Building Code 2018 of Maryland > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.1 Masonry Walls > 722.4.1.3 Multiwythe Walls With Airspace
722.4.1.3 Fire and Smoke Protection Features, Multiwythe Walls With Airspace
Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined by the formula ...
Building Code 2015 of Maryland > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.1 Masonry Walls > 722.4.1.3 Multiwythe Walls With Airspace
1404.3.4 Exterior Walls, Minimum Clear Airspaces and Vented Openings for Vented Cladding
For the purposes of this section, vented cladding shall include the following minimum clear airspaces: Vinyl, polypropylene or horizontal aluminum ...
Building Code 2018 of Maryland > 14 Exterior Walls > 1404 Installation of Wall Coverings > 1404.3 Vapor Retarders > 1404.3.4 Minimum Clear Airspaces and Vented Openings for Vented Cladding
1405.3.4 Exterior Walls, Minimum Clear Airspaces and Vented Openings for Vented Cladding
For the purposes of this section, vented cladding shall include the following minimum clear airspaces: Vinyl lap or horizontal aluminum siding ...
Building Code 2015 of Maryland > 14 Exterior Walls > 1405 Installation of Wall Coverings > 1405.3 Vapor Retarders > 1405.3.4 Minimum Clear Airspaces and Vented Openings for Vented Cladding
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