Measuring Masonry Work Chapter 6 Measuring Masonry Work

Objectives Upon completion of this chapter, you will be able to: Explain how masonry work and associated items are measured in a takeoff Explain how masonry items are classified in the takeoff process Measure masonry items from drawings and specifications

Objectives (cont’d.) Use conversion factors to calculate quantities of bricks, blocks, and masonry mortar Complete a manual takeoff of masonry work and associated items Complete a computer takeoff of masonry work using Excel spreadsheets

Masonry Work Generally Includes construction with: Clay bricks Concrete bricks and blocks Clay tiles Natural and artificial stone Typically performed by subcontractors

Measuring Masonry Work Measure “net in place” Calculating masonry units: Two-stage process Area of masonry is measured Standard factor is applied to determine number of masonry units A number of other units are measured Detailed in drawings or described in specifications

Brick Masonry Bricks: Influential factors: Made of different materials Manufactured by different methods Used in many ways Influential factors: Price of masonry Measurement: sizes and pattern

Concrete Blocks Variables to consider: Bond beams Sizes Thickness of joints Bond beams Measured as “extra over” blockwork Figure 6.1 Typical Concrete Block Sizes (Delmar/Cengage Learning)

Figure 6.2 Nominal and Actual Block Thicknesses (Delmar/Cengage Learning)

Conversion Factors The Building Estimator’s Reference Book States number of “standard bricks” per square foot of wall for different: Wall thicknesses Joint thicknesses Various bonds

Measuring Notes—Masonry Generally: Measure quantities “net in place” Separately measure circular masonry work Include scaffolding and hoisting Measure separately by category Measure and enumerate several additional items (listed on page 144)

Measuring Notes—Masonry (cont’d.) Some additional considerations: Brick masonry Measure in units of bricks Separately measure facing bricks Concrete block masonry Enumerate units stating type and size of blocks Separately enumerate special units Measure in cubic yards or cubic meters

Examples Masonry work—house (brick facings alternative) Takeoff shown as Figure 6.3a Masonry work—office/warehouse building Takeoff shown as Figure 6.4

Figure 6.3a House Example—Masonry Work (Delmar/Cengage Learning)

Figure 6.3b Brick Facings Alternative—Details (Delmar/Cengage Learning)

Figure 6.3c Brick Facing—Detail at Foot of Facings (Delmar/Cengage Learning)

Figure 6.4 Office/Warehouse Example—Masonry Work (Delmar/Cengage Learning)

Figure 6.4 (Continued)

Summary Masonry work Includes construction with clay bricks and tiles, concrete bricks and blocks, etc. Typically performed by subcontractors Several items are measured during takeoff Quantities of masonry units are measured net in place Classified by types of units and use