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Fastening to structural Insulated Panels (SIPS)

Fastening to structural Insulated Panels (SIPS)

Fastening to structural Insulated Panels (SIPS)

(OP)
If you have ever designed anything with structural insulated panels(SIPs) you will know how little design data there is out there.  I have a client wanting to attach stone veneer (+/- 15 psf)to SIPs with a metal lath.  Code would have you attach the lath to the vertical studs @ 6" o.c. with 11 gage nails or 16 gage staple.  The problem is SIPs have no vertical studs except at joint splines. The core is foam. The SIPS exterior skin is 7/16" O.S.B. sheathing.  I am trying to quantify a shear/withdrawal value for #6 screws into the sheathing. (NDS) The National Design Specification from the American Wood Council maintains a minimum thread  penetration depth(p)of 10d (d = screw diameter)for their tabulated screw values. The tabulated values can then be adjusted for lesser penetration by a factor of p/10d when 6d < p < 10d.  The diameter of a #6 screw is .138".  That being the case I would need at least .828" of thread penetration to qualify for the adjustment.  How should I determine a value when the thread penetration is only .4375" (3.17d). Is there some other design data to determine design values of screws in 7/16" sheathing.  

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