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Division 4 - Masonry

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Division 4 - Masonry

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    1. BCN5618 1 Division 4 - Masonry Concrete Masonry Unit (CMU) Brick Mortar Accessories horizontal masonry reinforcement – wall ties lintels - coping - sills Reinforcing Bars Cleaning Equipment

    2. BCN5618 2 Concrete Masonry Unit Separate masonry according to: size of the units shape of the units colors of the units type of bond (pattern) shape of the mortar joints color of the mortar joints fire rating

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    6. BCN5618 6 Concrete Masonry Unit The standard modular face dimensions of the CM units are 7 5/8" high and 15 5/8" long. Thicknesses available are 3, 4, 6, 8, 10, and 12 inches (nominal, actual dimensions are 3/8"less). A 3/8" mortar joint provides 8"x16" face dimension (112.5 units per 100 sf of wall). Heavy weight versus lightweight units

    7. BCN5618 7 Concrete Masonry Unit Thicker face shells are required for a specific fire rating. Unit: No of units required (SF of wall x 1.125) Corners should only be taken once. Deduct all openings in excess of 10 sf. Allowance for waste and breakage: 5 to 10% Cutting of the units is expensive and should be anticipated.

    8. BCN5618 8 Bricks Brick is a solid masonry (when its core unit is less than 25% of the cross sectional area) made of clay. Bricks are classified by: kind (common or face) size texture or finish on the face

    9. BCN5618 9

    10. BCN5618 10 Bricks No. of brick per square foot of wall depends on: size of brick (standard size: 2 1/4"x 3 3/4"x 8") width of the mortar joint style of bond For running bond with 3/8" thick mortar joint, number of standard brick per 100 sf is 675 Make deduction for all openings Waste: 5 to 10%

    11. BCN5618 11

    12. BCN5618 12 Mortar Masonry mortar usually consists of Portland cement, mortar sand, and hydrated lime. Type M - 1:1/4:3 mix by volume - 1 part cement, Ľ part lime 3 parts sand) for heavy loads and below grade Type N - 1:1:6 for use above grade 3/8" is a common mortar joint thickness, but 1/4" and 1/2" joints are also used. Colored mortars (red, brown, white, and black) may be used.

    13. BCN5618 13

    14. BCN5618 14 Horizontal Masonry Reinforcement Steel reinforcing is placed continuously in the mortar joints to minimize shrinkage, temperature, and settlement cracks in masonry and to provide resistance to shear. Unit: LF (note the size, type, plain or corrosion resistant, and spacing). Add 5% for waste and 5% for lap. For large quantities (over 1500 sf) multiply the square footage by the factor: Reinforcement every course, 1.5 Reinforcement every other course, 0.75

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    19. BCN5618 19 Reinforcing Bars Vertical reinforcing (to provide lateral support) Horizontal reinforcing in bond beams Unit: ton  

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    22. BCN5618 22 Wall Ties to tie the outer wythe with the inner wythe type of ties spacing (horizontally and vertically) unit: each

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    25. BCN5618 25 Coping Covers the top course of a wall to protect it from the weather. coping block (no of units) stone (lf, note type, width, and thickness) precast concrete (lf, note width, thickness, and finish)

    26. BCN5618 26 Sills members at the bottom of window or door openings brick (no. of units) stone (lf, note type, thickness, and width) precast concrete (lf, size) 

    27. BCN5618 27 Lintels steel (lb, misc. metal Div. 5) precast concrete (lf of each size) lintel block with rebar and filled with concrete (no. of units , size)

    28. BCN5618 28 Cleaning the type of materials required to clean with the area of the surfaces to be cleaned Example: acid wash, smooth brick $0.40/sf Acid wash, rough brick $0.55/sf  

    29. BCN5618 29 Equipment scaffolding (length of time required, height, rent or own) hoisting equipment mortar mixer

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