Chapter 4 Measuring Concrete Work

Introduction A concrete takeoff requires the estimator to measure a combination of items: Concrete Forms Rebar Finishes and miscellaneous items The concrete is usually detailed on the drawings, while the other items have to be inferred from the information about the concrete.

Assembly Takeoff Estimators should proceed assembly-by-assembly in their concrete takeoff. An assembly is a component of the job that consists of a number of items, e.g. a pad footing comprising: Concrete Forms Rebar etc. Recommended procedure Take off assembly one. Measure the concrete first. Assess formwork and other required items. After completing assembly one, pass on to assembly two and so on.

Measuring Notes - Concrete Concrete measured in cubic yards net in place No deductions for reinforcing steel No deductions for openings less than 1 cu. ft. Concrete measured in separate categories Pile caps Footings Etc. Different mixes of concrete measured separately

Measuring Notes - Formwork Generally measured in square feet of contact area i.e. the surface of formwork that is in contact with the concrete Classified into the same categories as concrete Curved surfaces measured separately Bulkheads, blockouts, and edge forms measured separately Forms measured over concrete openings such as windows in walls Edges, grooves, chases, keyways, chamfers measured in linear feet Forms to circular columns measured in linear feet

Measuring Notes - Finishes Concrete finishes measured in square feet Classified in terms of what is being finished: slabs, walls, columns, stairs, etc. Curing slabs measured in square feet Vapor barriers measured in square feet (add 10% to allow for laps) Welded wire mesh measured in square feet (add 10% to allow for laps)

Measuring Notes – Rebar and Other Items Bar reinforcing steel is measured in linear feet and converted to a weight by multiplying the lengths by the unit weight per foot. Inserts such as anchor bolts are described and enumerated. Inserts such as waterstops are measured in linear feet. Expansion joints are measured in linear feet stating the size of joint and the type of material used. Grout to anchor bolts and base plates are measured in cubic feet. Saw cuts to concrete are measured in linear feet.

Takeoff Exercise Takeoff the concrete work for the house example shown on Figure 3.5 drawings See figures 4.5A and 4.5B