Masonry Veneer - Chapter 6. Masonry Veneer Anchored Veneer

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1 Masonry Veneer - Chapter 6 Chapter 6 covers anchored and adhered veneer. Following are prescriptive requirements for areas with wind 110 mph Vertical support of masonry veneer Support: Noncombustible structural Preservative-treated wood foundation Wood construction Interior finish on wood framing Deflection of floor, lintel, or wood support Backing Masonry or concrete Wood framing Cold-formed steel framing No height limitation Height 18 ft Weight 40 psf; height 12ft Weight 40 psf L/600 or 0.3 in No height limitation Height 30 ft at plate; 38 ft at gable Support by noncombustible construction at each story above 30 ft at plate or 38 ft at gable Unreinforced Masonry 1 Masonry Veneer Anchored Veneer Unreinforced Masonry 2

2 Masonry Veneer - Anchor Types Corrugated Sheet Metal Joint reinforcement Sheet Metal Adjustable Wire anchors Unreinforced Masonry 3 Masonry Veneer Wall Anchorage Details Unreinforced Masonry 4

3 Anchor type Anchor type Corrugated sheet metal anchor 7/8 in wide; 0.03 in thick Corrugation wave length of 0.3 to 0.5 in Corrugation amplitude of 0.06 to 0.10 in Sheet metal 7/8 in wide; in thick Corrugated, bent, notched, or punched Wire anchors W1.7 wire with ends bent to form at least a 2 in extension Joint reinforcement W1.7 cross wires at maximum spacing of 16 in o.c. Embed longitudinal wire into mortar joint with at least 5/8 in in mortar on each side Adjustable Maximum clearance between connected parts of 1/16 in Two pintle legs of W2.8 wires with offset 1 1/4 in Unreinforced Masonry 5 Anchor spacing Wall area supported by anchor Adjustable two-piece, W1.7 wire, or corrugated sheet metal All other anchors 2.67 ft ft 2 Maximum spacing 32 in horizontally; 18 in vertically Spacing at opening 16 in. in either dimension 3 ft on center within 12 in of opening High wind areas (110 mph < v 130 mph) Reduce supported wall area to 70% of above requirement Maximum spacing is 18 in horizontally and vertically Anchor spacing around openings reduced to 24 in Unreinforced Masonry 6

4 Veneer backing Wood framing Any anchor type permitted Attach anchor to wood with corrosion resistant 8d common nail Nail within 1/2 in of 90 degree bend for corrugated sheet metal anchors 4.5 in maximum cavity, except 1 in maximum cavity with corrugated sheet metal anchors 1 in minimum air space Steel Adjustable anchors Corrosion resistant framing with minimum base metal thickness of 0043i in Corrosion resistant screws with minimum nominal shank diameter of in 4.5 in maximum cavity; 1 in minimum air space Masonry or concrete Masonry backing Concrete backing 4.5 in maximum cavity; 1 in minimum air space Wire, joint reinforcement, or adjustable anchors Adjustable anchors only Stack bond veneer: Single W1.7 wire joint reinforcement at 18 in o.c. Unreinforced Masonry 7 Masonry Veneer Seismic s Seismic Performance Category C D Isolate top and sides from vertical and lateral seismic forces Reduce maximum wall area supported by each anchor by 25% (vertical and horizontal spacings remain unchanged) E Vertical expansion joints at all returns and corners Mechanically attach veneer joint reinforcement to anchors with clips or hooks Support weight independently at each story Single-wire W1.7 joint reinforcement at 18 in o.c. Unreinforced Masonry 8

5 Glass Unit Masonry - Chapter 7 Standard size: 3 7 / 8 in thick Thin size: 3 1 / 8 in thick hollow; 3 in thick solid Location Standard Units Thin Units Exterior Figure ft 2 ; 15 ft wide; 10 ft high wind 25 ft wide; 20 ft high pressure 20 psf Interior 250ft 2 ; 25 ft wide; 20 ft high 150ft 2 ; 25 ft wide; 20 ft high Approximation to Fig (r 2 =0.992) Panel area ( 2 ft ) 1360[Wind pressure ( psf )] Lateral support: Anchors at 16 in on center or recess glass 1 in into channels; must be able to support applied load or 200 lb/ft. Isolation: Isolate from in-plane loads Expansion Joints: 3/8 inch along top and sides Reinforcement: Horizontal joint reinforcement at 16 in o.c. of 2-W1.7 wires Unreinforced Masonry 9