Yikes
Gold Member
In a Type V wood framed building, I had designed attic draft stops per code (CBC 708.4, 718.4) using 1/2" plywood.
The design-build sprinkler installer chose to use Tyco CC-2 sprinkler heads and mostly CPVC pipe.
The Tyco spec sheet has the following comment regarding draft stops:
What does this mean? Even the best insulation allows some heat to escape. What level of performance should we be looking for in a draft curtain or draft stop? The contractor installed 1/2" plywood as per CBC 718.3.1, but we do not have a performance criteria for "not allow heat to escape".
https://tyco-fire.com/TD_TFP/TFP/TFP632_12_2018.pdf
The design-build sprinkler installer chose to use Tyco CC-2 sprinkler heads and mostly CPVC pipe.
The Tyco spec sheet has the following comment regarding draft stops:
"Concealed Space Area (CPVC Pipe) The area of the concealed space is not limited; however, for both Figure 2 and Figure 3, where CPVC pipe is being utilized, draft-curtains or full height walls must be provided at 1000 ft² (93 m²) areas. This draft curtain shall be at least 1/3 the depth of the concealed space or 8 in. (200 mm), whichever is greater, and be constructed using a material that will not allow heat to escape through or above the draft curtain."
What does this mean? Even the best insulation allows some heat to escape. What level of performance should we be looking for in a draft curtain or draft stop? The contractor installed 1/2" plywood as per CBC 718.3.1, but we do not have a performance criteria for "not allow heat to escape".
https://tyco-fire.com/TD_TFP/TFP/TFP632_12_2018.pdf