WCR

Synthetic Rubber - Masonry Control Joints

Cracks in masonry walls may be caused by many factors. Temperature or shrinkage induced volume changes of wall materials, stresses induced by live or dead loads (including foundation movement, earth, wind pressure, water and building movement). Are only a few of the many reasons masonry walls crack. But regardless of the cause, one thing is certain..cracks must be controlled to maintain moisture, resistance and appearance.

Control and expansion joints, with joint reinforcement, control cracks by providing as vertical stress relieving joint in the masonry wall while maintaining adequate shear strength for lateral wall stability.

Masonry Control Joins should be used about every 25 feet in average walls, but should not be spaced more than twice the wall height for high walls. They are usually needed at the abutment of walls and columns at return angles in "L" and "T" shape construction; at wall openings; at construction joints in foundations, roofs and floors; at major change in wall thickness or height and at recesses or chases of piping and columns. They are also used when brick or stone veneer is applied to block, with control joint extending through both.

Synthetic Rubber Masonry Control Joint Specification

SECTION 04150

SIZE LENGTH & PUT UP

#571 2-1/8" 4 FT.

#572 2-5/8" 4 FT.

#574 4-7/8" 4 FT.

#575 6-7/8" 4 FT.

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Synthetic Rubber Masonry Control Joint, classified per ASTM D

2000-92, is Type RUBBER-2 AA 805 A 13 F 17. The material

meets or exceeds the following properties when tested in

accordance with stated test methods.

PROPERTY TEST METHODS VALUE

Durometer ASTM D 2240 80 Shore A Units

Hardness (+/-5)

Elongation ASTM D 412 300% minimum

Testile Strength ASTM D 412 2100 psi 14.4MPa)
minimum

Brittleness ASTM D 2137 -40 F (-40 C)

Temperature

Shear ASTM D 732 1800 psi. mimimum

Shear/lin. in. 1.125 lb.

Flexible Polyvinylchloride Masonry Control Joint Specification

SECTION 04150

SIZE LENGTH & PUT UP

#671 2-1/8" 4 FT.

#672 2-5/8" 4 FT

#673 2-5/8" 4 FT.

#674 4-7/8" 4 FT.

#675 6-7/8" 4 FT.

#676 11-1/8" 4 FT.

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Flexible PVC Masonry Control Joint, classified per ASTM D

2287-81, is Type PVC-55507. The material meets or exceeds the

following properties when tested in accordance with stated test methods.

PROPERTY TEST METHODS VALUE

Durometer ASTM D 2240 75 Shore A Units

Hardness (+/-5)

Specific Gravity ASTM D 792 1.35 nominal

Elongation ASTM D 412 300% minimum

Testile Strength ASTM D 412 2020 psi (13.92 MPa)
minimum

Brittleness ASTM D 746 -40 F (-40 C)

Temperature

Shear ASTM D 732 1200 psi.mimimum

Shear/lin. in. 750 lb.

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