Enter board width and joist spacing. Narrow boards and tight joists can need far more screws than a box suggests.
How it works
Every board crossing a joist takes your screws per crossing. Rows per foot × joists per foot × screws, plus 10%.
Before you order
- Pre-drill near board ends to reduce splitting.
- Use screws rated for your treated lumber or decking type.
- Keep a spare box on hand since a few always strip or snap.
Common questions
How many screws per 100 square feet of decking?
About 350 for 5.5 inch boards on 16 inch joists at two screws per crossing.
Screws or hidden fasteners?
Both work. Hidden systems look cleaner, and each has its own count per crossing on the box.