Chapter 4 Measuring Concrete Work Introduction A concrete

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. 5 A and 4. 5 B