We are a structural engineer currently work for an architect on a small assembly hall project; a wedding venue that will seat over 99, which will require sprinkler protection.
The roof structure will be wood scissors trusses, 5’-7” deep at the center – see below.
I mentioned to the architect that they will have to protect the “attic” space also with sprinklers.
In response, the architect said the owners want to finish the ceiling and insulate the attic space.
Where is it written about the maximum cavity size without sprinklers? Is it any cavity?
If so possibly we fill the entire attic space, which is small because of the unique scissors trusses. I don’t think this would be economical or practical.
But, what would the cavity depth have to be (underside of roof deck to top of batt or blown insulation) so that sprinkler protection of that concealed combustible space is not required?
I assume if this space is not sprinkler protected that “attic” compartments would be required. Any guidance on this matter would be appreciated. Thank you.
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