Materials
Fixing quantity allowance
- where
- fixing count
- members
- fixings per member
- waste (%)
- boxes
- fixings per box
Explain this equation
Estimates how many screws, nails or other fixings to order, and how many boxes, from a fixed number per member.
m is the number of members and f the fixings for each. w is the waste percentage. N is the total fixings to order. s is the number in a box, and B the number of boxes.
Multiplying members by fixings per member gives the net count, and (1 + w/100) adds an allowance for drops and bent nails. The ⌈ ⌉ brackets round up, first to whole fixings and then to whole boxes.
20 members at 4 fixings with 10% waste is 88 fixings, which is one box of 100.
Watch out: this counts fixings only. Size, type, spacing and corrosion class come from the fixing schedule.
Estimate fixings from the specified number per member.
Enter your values to see the result.
Good to know
Does not choose fixing diameter, length, embedment, spacing or corrosion class. Use the approved fastening schedule.
Limits
Flooring gaps, slide clearances, fire-door gaps, fixing schedules and finishes must follow the design and product instructions.
Sources
- Geometry / arithmetic
This is a calculation aid, not a structural design or compliance certificate. Every default is an example, not a specification for your project.