Corrugated Metal Roof Decking

Engineerz

I have a job that originally spec'd 20 gauge N deck. Now a concrete roof will be poured over the roof decking and the contractor changed the decking to a 20 gauge "Q" deck. I cant find spec's for a Q deck anywhere. Is is the same as B? Is is sufficient to hold the weight of the concrete with 7 foot spans?

Kgmz

3" deep type N deck is also known as Q-Deck.

Can't you just ask the contractor who the supplier is, and get the info from them.

Engineerz

I specified 20 gauge 3" N deck, he used 20 gauge, 1-1/2" "Q" deck.

Anti-wingnut

I would ask an engineer

AaronB.

Find the manufacturer and get the max span from them and find out the max weight for said span.

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