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GABLE-END TRUSSES WITH PLYWOOD

GABLE-END TRUSSES WITH PLYWOOD

GABLE-END TRUSSES WITH PLYWOOD

(OP)
Is it assumed that by applying plywood to one face of a structural gable-end truss, this gives it the ability to resist the same shear load of the shear wall that it bears on? Assume that the truss HAS NOT been designed to resist any type of drag load.

Wouldn't lack of sufficient nail-penetration potentially be an issue? For example, under UBC 1997, to use 15/32" plywood, the required minimum nail penetration in the framing is 1 1/2" with 8d nails. In this particular case, you are only getting 1" of penetration into the gable end.

Thanks to all in advance

RE: GABLE-END TRUSSES WITH PLYWOOD

(OP)
Regarding:  "Wouldn't lack of sufficient nail-penetration potentially be an issue? For example, under UBC 1997, to use 15/32" plywood, the required minimum nail penetration in the framing is 1 1/2" with 8d nails. In this particular case, you are only getting 1" of penetration into the gable end."

Ignore this.....It's been a long day.

Again, to be clear, the questiion is,  "Is it assumed that by applying plywood to one face of a structural gable-end truss, this gives it the ability to resist the same shear load of the shear wall that it bears on? Assume that the truss HAS NOT been designed to resist any type of drag load."

RE: GABLE-END TRUSSES WITH PLYWOOD

Just a FYI - A truss manufacturer will design gables to withstand drag forces IF the building designer will specify this, along with the design load, on the plans.

RE: GABLE-END TRUSSES WITH PLYWOOD

(OP)
Thanks Trussme68,

Yes, I realize this. I was asking for those instances when drag loads are not specified. The structural designs in these cases usually specify a detail showing plywood on the truss in the case when the truss is not designed to withstand a drag load.

RE: GABLE-END TRUSSES WITH PLYWOOD

If this ability is assumed, do you assume the builder will properly attach the gable truss to the wall it sits on?  That would probably be the weakest link.

RE: GABLE-END TRUSSES WITH PLYWOOD

ctcray and ARJ1:

You would have to detail the connection to the top plate of the wall below that would, in all liklihood, become the drag link you are talking about to any shearwall configuration below, not the endwall truss.  As the studs in the truss are most probably vertical and flat, the penetration will be less unless it is specified for the studs to be turned 90 degrees to the norm - higher cost?

Might be cheaper to come in and sister on the studs needed to get more penetration for the neiling if needed.

Mike McCann
McCann Engineering

RE: GABLE-END TRUSSES WITH PLYWOOD

(OP)
Mike,

Please correct me if I am wrong: the nail penetration issue would only come into play if it was less than the required minimum nail penetration specified in the shearwall schedule. Is this correct?

RE: GABLE-END TRUSSES WITH PLYWOOD

Usually a shearwall schedule indirectly specifies the required penetration by specifying the nail size.  SO, I guess the answer is yes.

Mike McCann
McCann Engineering

RE: GABLE-END TRUSSES WITH PLYWOOD

(OP)
Thanks to everyone for your help.

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