Roof Deck Deflection

Commentary the adequacy of deck edge support details should be revised.

Roof deck deflection.

A metal roof deck diaphragm is a fairly flexible system somewhat analogous to a truss as shown in figure 2. All structural members will deflect or flex under load. Deflection of the deck shall not exceed l 240 under the uniformly distributed design live load. Standard structural decking patterns are 2 nominal tongued and grooved t g and 3 and 4 double t g products available with vee or eased edges to meet discriminating architectural requirements.

The amount of flex depends on the magnitude of the load applied span of the member and stiffness of the member. The insurance fire rating or wind uplift requirements of a building may not allow a substitutionof fasteners or change inspacingasgoverned by design. Designer should check the deflection of the diaphragm. Structural decking also known as roof decking should not be confused with lumber intended for residential and non residential outdoor decks.

2 deep roof deck and has since replaced the previous industry standard 36 5 and 36 7 attachment patterns. Allowable deflection is generally expressed as a fraction of the span in inches. Roofdeck is a spreadsheet program written in ms excel for the purpose of analysis and design of roofs with steel deck. All spans are to be considered center to center of supports.

Bending stresses as well as deflections are checked. Other innovations include n 32 a 32 wide 3 deep roof deck panel and our new smooth series rivet attachment for our portfolio of cellular deck products.