Estimating in Building Construction

Other Estimating Methods 231

cost is then used to bid the assembly by multiplying the
quantity of the assembly by the unit cost of the assembly.

EXAMPLE 21-5 WALL ASSEMBLY UNIT COST

Determine the quantities of materials needed and the costs for an
8-foot-high interior partition wall assembly. The wall consists of
track and metal studs, insulation, 1/2drywall on both sides, and
paint. The studs are 16on center. Openings in the partition will be
handled as a separate assembly.

The costs are as follows:

Studs ($)0.75 each$9.52 per each$7.14

Track ($) 2 ¿$1.80 per lf$3.60

Area of paint2 sides 8 ¿ 1 ¿16 sf

Area of drywall2 sides 8 ¿ 1 ¿16 sf

Area of insulation 8 ¿ 1 ¿ 15 – > 16 – 7.5 sf

Number of studs 1 ¿> 16 –  12 – > 16 – 0 .75 each

Length of track 2  1 ¿ 2 ¿

FIGURE 21.4.Steel Joists, Beams

and Deck on Columns and Walls.

From Means Square Foot Cost Data 2007.

Copyright RS Means, Kingston, MA 781-

585-7880; All rights reserved



EXAMPLE 21-6 ASSEMBLY ESTIMATING USING

INTERIOR WALL ASSEMBLY

Determine the cost of 251of an 8-foot-high interior wall using the

unit cost from Example 21-5.



In Square Foot Costs,RS Means publishes cost data for a

number of assemblies that can be used to prepare an assem-

bly estimate for an entire building. The costs for a steel joist

and deck roof that bears on the exterior walls and steel

columns are shown in Figure 21.4. The cost estimate is pre-

pared by determining the costs for each assembly and then

by adding these costs together.

Cost ($) 251 ¿$52.50$13,177

Total cost ($>ft)$52 .50

Paint ($) 16 sf$0.61 per sf$9.76

Drywall ($) 16 sf$1.62 per sf$25.92

Insulation ($)7.5 sf$0.81 per sf$6.08