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Re: Plywood roof to steel angle connection

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Does the screw use a full diameter shank, or does the resulting hole drilled by the wings result in a "loose" connection / oversized hole?

Jordan

Paul Blomberg wrote:
I've had good experience with a DART flat head winged
self drilling self tapping screw.  The screw goes
through plywood and into up to steel 1/4".  The
"wings" cut a larger hole through the wood and break
off when they hit the steel.  This way the wood has a
pilot hole that is large enough that the screw threads
clear and the panel and won't push away from full
bearing on the steel while drilling.

Some of their other screws claim to 1/2" steel (hex
washer head DARTS self-drilling screws).  

Their web site is
http://www.marker-darts.com/section9/ptlstdarts.htm#flat%20head
and they have an ICC report.

Paul.
Phoenix, AZ

--- Gautam Manandhar
<Gautam_Manandhar(--nospam--at)ci.richmond.ca.us> wrote:

  
List members:

I am working on a residential remodel consisting of
steel angle truss at eigth feet on centers.  The
architect does not want any nailers on the trusses. 
2x4 roof joist span parallel to the trusses and
supported by 6x3 1/2 x 5/16 double angles spanning
between the trusses.  The thickness of the angle is
1/2".  The plywood sheathing is 1/2".  What kind of
self drilling screws are usually specd out.  Self
drilling metal screws to connect plywood to metal
usually are for metal thickness upto 20 gage.  Is it
possilbe to spec out pre-drilling the angle and then
inserting a 8# self drilling grabber metal screws. 


Gautam


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