Derek Brown from Madison (WI) Firehouse 7 sent in these photos of new style of roof construction he and the crew ran into in their first due. The building in the photo is a two-story day care facility that features an interesting style of roof construction.
The building has steel trusses with corrugated metal sheet decking directly over the truss system.
On top of the corrugated decking there are fire rated 2×4’s acting as a purling. Over the purling is fire rated 3/4’†plywood. The roof will be finished off with traditional tab shingles. Once completed the roof will look no different than an ordinary shingle roof.
Accomplishing a vertical vent on this building would be interesting if the style of construction was not know ahead of time. A good carbide tip on the chain saw should get right through the entire assembly, but will certainly take a bit longer than traditional plywood or OSB decking.
Is this the same “fire rated” plywood that actually delaminated quickly under fire conditions in order for the fire to vent itself? If so, I do not see any advantage to its use in this application. RE the carbide chain saw, what is the gauge of the Q-deck material and are carbide chains rated for the thickness steel? Good eye for finding this; thanks ALOT to the building dept. for keeping us aware of these “advances”!!
What is the purpose of using a metal roof only to cover it with a substantial amount of weight? It would be interesting to find out the load rating of those metal trusses, which Im sure will have a drop ceiling and lighting hanging from the interior side.
wonder if they are gonna use those dept. store kid kennels in an article a few years back…
makes life interesting for us…
This is why inspection cuts should be done on every single roof before you get away from the ladder. Undress the roof right away.