Steel Diaphragm Roof Decks

Deck types are described in the steel deck institute sdi publication no.

Steel diaphragm roof decks.

Diaphragm design information for vulcraft roof and floor decks is based on the steel deck institute diaphragm design manual third edition ddm03 in accordance with the 2015 ibc. Steel deck steel deck is a cold formed corrugated steel sheet supported by steel joists or beams. Steel or aluminium structural decking. Roof diaphragm panels typically vary from 0 0295 inches to 0 064 inches in thickness and come in widths of 18 inches to 36 inches or more.

Asc steel deck was an early innovator of the mechanical side seam attachment method with the introduction of the deltagrip tool in 2003. The fourth edition of the sdi diaphragm design manual ddm04 replaces the third edition ddm03. The profile contains 3 ribs and is 24 inches wide with male and female edges creating an interlocking side lap when installed. First to market in 2009 our 36 7 4.

It was developed to provide a structurally efficient product for use in roof and floor systems. Both asd and lrfd solutions are provided for strength and stiffness for 1 1 2 wide rib and 3 deep rib roof deck. It includes information for the design of steel deck diaphragms for roof and floor decks and complies with the requirements of the ansi aisi s310 2013 north american standard for the design of profiled steel diaphragm panels. Historically published diaphragm design tables for roof deck have been based on diaphragm shear loads only.

It is used to support concrete or insulating membrane of a roof. It is also possible to design a diaphragm roof often referred to as a stressed skin design please refer to our technical department if a calculation service is required for the structural decking design on your building. Type n profiles are 3 inch deep structural roof deck that provide both vertical load and diaphragm shear capacity. Using 5 8 inch puddle welds for attaching deck to supports and 10 sidelap screws we find the nominal shear strength in the table for 0 0295 inch thick wr deck is 0 740 klf using a 36 4 12 inch o c support fastener pattern and 4 sidelap screws per span 15 inch o c.

31 design manual for composite decks form decks and roof decks. Using 5 8 inch puddle welds for attaching deck to supports and 10 sidelap screws we find the nominal shear strength in the table for 0 0295 inch thick wr deck is 0 740 klf using a 36 4 12 inch o c support fastener pattern and 4 sidelap screws per span 15 inch o c. The 3 inch deep ribs make n deck ideal for longer span conditions where b deck falls short. Using the steel deck institute sdi diaphragm design manual third edition we can determine the required deck fastening.