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ARCH 3013 Lecture Segment 11 Fundamentals of Quantity Takeoffs Part 2 INSTRUCTORS

# ARCH 3013 Lecture Segment 11 Fundamentals of Quantity Takeoffs Part 2 INSTRUCTORS

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ARCH 3013 ESTIMATING COURSE NOTES LECTURE SEGMENT #11 PART TWO FUNDAMENTALS OF QUANTITY TAKE OFFS 1 1. COUNTED ITEMS The simplest method to determine a quantity is by counting them. The most common unit is each .’ Care must be taken to mark off each item as it is counted so that you do not miss an item, group it together with another item or double count it. When possible use schedules and listings to double check your totals. When counting items that are repetitive, such as studs in a wall partition, time is saved by using a mathematical formula: Number = Distance/Spacing + 1 Number= Number of Counted items Distance=Distance over which the items occur Spacing=Spacing between the items When calculating repetitive units make sure that you always round up the quantity to the next whole number, even if the total is < .50 units. (i.e. 4.33 would equal 5) Example: Calculate the number of studs needed for a 4’-0” long wall when the studs are spaced 1’-0” on center: Number= (4’-0”)/(1 foot) +1 = 5 2. LINEAR COMPONENTS These components are measured by their ‘ length .’ When a linear unit is composed of multiple pieces, the pieces can be attached by butting one to another of by overlapping them. Common units are ‘ lineal feet ’ or ‘ each .’ When counting linear items use the plans with a scale or plan measurer. BIM is now becoming a major new tool in this regard. Time is saved by using a mathematical formula: Number = Length/(Effective Length) Number= Number of Pieces needed Length=Length of Linear Component Effective Length=Distance between the start of the pieces The effective length is equal to the length of the pieces that make up the components less the length of the lap and is determined as follows; Effective Length = Length Piece - Lap Length Piece

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ARCH 3013 Lecture Segment 11 Fundamentals of Quantity Takeoffs Part 2 INSTRUCTORS

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