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722.4.1.3 Multiwythe Walls With Airspace

Florida Building Code 2014 > 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
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Where a continuous airspace separates multiple wythes of the wall or partition, the total fire-resistance rating shall be determined by the formula:

R = (R10.59 + R20.59 +...+ Rn0.59 +as) 1.7(Equation 7-10)
where:
R=The fire-resistance rating of the assembly (hours).
R1, R2 and Rn=The fire-resistance rating of the individual wythes (hours).
as=Coefficient for continuous airspace.
Values for Rn0.59 for use in Equation7-10 are given in Table722.4.1(3). The coefficient for each continuous airspace of 1/2 inch to 31/2 inches (12.7 to 89 mm) separating two individual wythes shall be 0.3.

Related Code Sections


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 ...
Florida Building Code 2014 > 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 ...
FBC, Building 2017 > 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
722.4.2 Fire and Smoke Protection Features, Multiwythe Walls
The fire-resistance rating for walls or partitions consisting of two or more dissimilar wythes shall be permitted to be determined by the formula ...
FBC, Building 2017 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.4 Clay Brick and Tile Masonry > 722.4.2 Multiwythe Walls
A106.3.2.1 : Guidelines for the Seismic Retrofit of Existing Buildings, Multiwythe Solid Brick
, or the backing wythes shall be bonded together with separate headers with their area and spacing conforming to the foregoing. Wythes of walls not bonded ...
FBC, Existing Building 2017 > A : Guidelines for the Seismic Retrofit of Existing Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry > A106.3.2 Lay-Up of Walls > A106.3.2.1 Multiwythe Solid Brick
A106.3.2.1 Guidelines for the Seismic Retrofit of Existing Buildings, Multiwythe Solid Brick
, or the backing wythes shall be bonded together with separate headers with their area and spacing conforming to the foregoing. Wythes of walls not bonded ...
Florida Existing Building Code 2014 > A Guidelines for the Seismic Retrofit of Existing Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry > A106.3.2 Lay-Up of Walls > A106.3.2.1 Multiwythe Solid Brick
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