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// CODE SNIPPET

R302.2.2 Common Walls

Residential Code 2018 of Maryland > 3 Building Planning > R302 Fire-Resistant Construction > R302.2 Townhouses > R302.2.2 Common Walls
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Common walls separating townhouses shall be assigned a fire-resistance rating in accordance with Item 1 or 2. The common wall shared by two townhouses shall be constructed without plumbing or mechanical equipment, ducts or vents in the cavity of the common wall. The wall shall be rated for fire exposure from both sides and shall extend to and be tight against exterior walls and the underside of the roof sheathing. Electrical installations shall be in accordance with Chapters 34 through 43. Penetrations of the membrane of common walls for electrical outlet boxes shall be in accordance with Section R302.4.

  1. Where a fire sprinkler system in accordance with Section P2904 is provided, the common wall shall be not less than a 1-hour fire-resistance-rated wall assembly tested in accordance with ASTM E119, UL 263 or Section 703.3 of the International Building Code.
  2. Where a fire sprinkler system in accordance with Section P2904 is not provided, the common wall shall be not less than a 2-hour fire-resistance-rated wall assembly tested in accordance with ASTM E119, UL 263 or Section 703.3 of the International Building Code.

Related Code Sections


R302.2.2 Building Planning, Common Walls
Common walls separating townhouses shall be assigned a fire-resistance rating in accordance with Item 1 or 2. The common wall shared by two ...
Residential Code 2018 of Maryland > 3 Building Planning > R302 Fire-Resistant Construction > R302.2 Townhouses > R302.2.2 Common Walls
R302.2.4 Building Planning, Structural Independence
Each individual townhouse shall be structurally independent. Exceptions: Foundations supporting exterior walls or common walls ...
Residential Code 2015 of Maryland > 3 Building Planning > R302 Fire-Resistant Construction > R302.2 Townhouses > R302.2.4 Structural Independence
1204.2.1 Interior Environment, Adjoining Spaces
of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room or 25 square feet (2.32 m 2 ...
Building Code 2018 of Maryland > 12 Interior Environment > 1204 Lighting > 1204.2 Natural Light > 1204.2.1 Adjoining Spaces
1205.2.1 Interior Environment, Adjoining Spaces
of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room or 25 square feet (2.32 m 2 ...
Building Code 2015 of Maryland > 12 Interior Environment > 1205 Lighting > 1205.2 Natural Light > 1205.2.1 Adjoining Spaces
716.3.2.1.2 Fire and Smoke Protection Features, Area Limitations
The total area of the glazing in fire-protection-rated window assemblies shall not exceed 25 percent of the area of a common wall with any room ...
Building Code 2018 of Maryland > 7 Fire and Smoke Protection Features > 716 Opening Protectives > 716.3 Fire Window Assemblies > 716.3.2 Performance Requirements > 716.3.2.1 Interior Fire Window Assemblies > 716.3.2.1.2 Area Limitations
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