The Standard Formula isn't the only game in town when it comes to calculating Item Quantity.
On Center Exception Factors
On Center Exception Factors instruct Quick Bid to substitute the normal Calculation Method when the 'on center' measure equals one of two predefined values. When these fields are populated and the on center (OC) value for an Item used in a Condition Detail matches 16" or 24" (or 400/600 mm in a Metric database) the value specified in the Exception Factor is used to calculate Item quantity values instead of the selected Calculation Method. This option is disabled if "Continuous" Installation Method is selected and when the Calculation Method is not "Standard Formula" or "Quantity * Height".
The Exception Factor is expressed as a decimal value and when used, no Waste is applied to the calculated quantity. The Exception Factors provide the estimator with another option for adding waste according to a specific factor. This method allows a different waste factor (%) for materials defaulting to 16” OC or 24” OC. The Installation Method controls the application of the Exception Factors.
How Exception Factors work
Using the Standard Formula, Quick Bid calculates the quantity of a material as follows:
Wall Length x Wall Height ÷ OC x Layers + waste % = Item quantity
Using the Exception Factors set to 16” OC = .85 and 24” OC = .65 (these Exception Factors are examples only, not cast-in-concrete numbers or even suggestions), Quick Bid calculates the Item detail quantity as follows:
Wall length x Wall Height x Exception Factor x Layers = Item quantity
If the Exception Factors for 16” or 24” OC are used, Quick Bid ignores any value entered in the Waste % field when OC = 16 or 24. The OC is also not factored into the calculation as in the Standard Formula (for all intents and purposes, the Exception Factor replaces the "on center" (OC) value in the Standard Formula).
The Exception factors are applied only when the OC for a Condition Detail line Item equals 16” or 24” (Imperial) or 400mm or 600mm (Metric). If a line Item uses any other OC values, Quick Bid uses the specified Calculation Method and Waste % so it is important to maintain a Waste % value even when using the OC Exception Factor formula.
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The Calculations tab: Installation Method