Roof fastener zoning tally calculator

Calculate fixings by zone and purchase fixings with spares with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use fixings by zone and purchase fixings with spares to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

JSON Zones [ID,area m²,supplied fixings per m²]
[["field",100,4],["edge",30,6],["corner",10,8]]
Supplied spare fraction
0.05
Fixings by zone
[["field",400],["edge",180],["corner",80]]
Purchase fixings with spares
693

Try another scenario

JSON Zones [ID,area m²,supplied fixings per m²]
[["field",100,4],["edge",30,6],["corner",10,8]]
Supplied spare fraction
0.1
Fixings by zone
[["field",400],["edge",180],["corner",80]]
Purchase fixings with spares
726
Calculation method

Calculation method

Fixings by zone

J([[r[0],ceil(r[1]*r[2])] for r in a])

Purchase fixings with spares

ceil(sum(ceil(r[1]*r[2]) for r in a)*(1+b))

Symbols and units
a
JSON Zones [ID,area m²,supplied fixings per m²]
b
Supplied spare fraction

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Calculation steps and notation

sum(list) adds all entries in the list.

Assumptions & limits

Assumptions & limits

  • All zone boundaries and fixing densities must come from approved project/manufacturer data. Quantity tally only, no load resistance determination. Supported limits: All numeric inputs must be finite. Only the explicitly described mathematical scenario is supported.
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