There always seems to be controversy about residential sprinklers in the garage.
I recently came across a section in the 2018 IRC under Section 309.5 and it states that private garages shall be protected by fire sprinklers (must be residential or quick response, designed to 0.05 gpm/sqft density) where the exterior wall has been designed based on Table 302.1(2) Note A.
This table addresses minimum fire resistance ratings for exterior walls. Note (a) allows fire separation distance for non-rated exterior walls and projections to be reduced to 0-feet, unlimited openings and penetrations, with a setback, where residential subdivisions are all sprinklered.
While looking at that table, I am not sure how to verify on the sprinkler plans if the garage meets that design method.
I have started asking the contractor to add a note on the plans regarding the design method and if they use this table and note to design the wall then sprinklers are required in the garage.
How would you interpret this section for compliance?
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