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Masonry Veneer as Structure and Deflection Reduction

Masonry Veneer as Structure and Deflection Reduction

Masonry Veneer as Structure and Deflection Reduction

(OP)
Consider an 8" structural wythe, 2" rigid insulation, a resulting 3/8 - 3/4" gap (from nominal), 4" concrete or brick veneer with dur-o-wal truss-type joint reinforcing at 16" oc vertical.

I've been told that masonry veneers are not an acceptable element to consider assisting the structure to resist lateral wind force and deflection, unless the joint reinforcing is strong enough to transfer.

Please explain, if veneer, braced by joint reinforcing, cannot be used, how does the wind transfer through to the structural wythe?

In other words, if the joint reinforcing is not strong enough to resist force, how is it strong enough to transfer force through it without damage?

Thank you!

RE: Masonry Veneer as Structure and Deflection Reduction

Are you talking about wind perpendicular to the wall or shear forces in the wall coming in from attached floors and roof parallel to the wall?

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RE: Masonry Veneer as Structure and Deflection Reduction

(OP)
Perpendicular

RE: Masonry Veneer as Structure and Deflection Reduction

A masonry veneer that is connected to the structural back-up wall with wire ties cannot "assist" the back up wall structurally since they are not compositely attached in a way that creates a stronger, deeper structural member. You would simply have two separate walls bending independently (each with their own flexural and shear stress) since the wire ties would bend and not produce an in-plane shear resistance.

Brick veneer does have some minimal flexural strength and stiffness but it is very very small and not worth the time to utilize in your calculations. That veneer flexural strength and stiffness is also quite variable and uncertain.

However, the wire ties can transmit the perpendicular wind force from the veneer back into the wall as the free air length of the ties is small and they can and do serve OK as small axial members between the two wythes.

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