Screw capacities in composite materials

[JAE]

I'm trying to use a piece of composite decking as a filler between a CFS 16 gage (54 mil) stud and a steel ledger angle.

A metal stud wall is covered with a 5/8" thick sheathing - non-structural type material.

The idea is to cut out a small 2" x 4" piece of sheathing at each stud and then screw a piece of composite filler (5/8" thick x 2" x 4") to the flange of a metal stud with two screws.
This offers a dense connecting material which would match the thickness of a light sheathing applied to the face of the studs.

So there's a connection between composite filler (screwing through the composite into the 16 gage stud flange) and then a connection between the steel angle and the composite (pre-drilled holes through the angle leg to allow screwing into the composite filler).

I have screw capacities for wood-to-wood and wood-to-CFS but not for the composite material.

Anyone know of any screw capacities like these?

 

[XR250]

You mean like Trex decking? Ledger carrying brick?

 

[JAE]

Yes - use of a composite material like Trex - screws in combined shear and tension like a steel ledger angle screwed into a composite board.

 

[SWComposites]

I would be very careful about putting any tensile load on a screw into a composite board. Find a way to thru bolt it.

 

[XR250]

Sounds a bit sketch to me, JAE.

 

[kissymoose]

Can't we screw through the composite into the stud behind?

 

[Tomfh]

What sort of loads are you talking? A few pounds? Or something serious.

Why can’t you screw through it to something solid?

 

[JAE]

Screw would go through a hole in the steel angle, penetrate through the composite, and then bite into the steel stud.

Tension would be taken via the thread grip on the steel stud - not the composite.

Shear would be taken into the composite and stud both - sort of a double one-way shear effect I guess.