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Re: Retrofit Diaphragm Blocking

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I have added blocking and attached it using A35s on the under side with
short screws.

On Thu, 13 Dec 2001 15:04:53 -0500 "Matthew Stuart" <m.stuart(--nospam--at)aespj.com>
writes:
> I upgraded a roof by attaching 2x nailers to the sides of the
> rafters/trusses and the bottom of the plywood deck using "Liquid 
> Nails". The
> manufacturer can provide you with the allowable shear stress of the
> material.
> 
> -----Original Message-----
> From: Caswell, Philip J [mailto:pcaswell(--nospam--at)bonestroo.com]
> Sent: Wednesday, December 12, 2001 2:56 PM
> To: 'SEAINT(--nospam--at)SEAINT.ORG'
> Subject: Retrofit Diaphragm Blocking
> 
> 
> Ok, say you have a plywood diaphragm that was shown and specified to 
> be
> blocked (Vmax > 420 plf), but the building is now built, with the 
> roof
> shingles installed and gyp board covering the wood truss roof bottom 
> chords
> - but no blocking.  The unblocked allowable shear is only 285 plf.
> 
> Has anyone had experience retrofitting blocking to a plywood roof 
> from the
> underside?  Can an adhesive be used for this?  Intuitively, if the 
> adhesive
> can achieve failure of the wood fiber, it should work.  Is there 
> anything
> published that can be referred to?
> 
> TIA,
> Philip J. Caswell, P.E.
> St. Paul, MN
> 
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