Decking & outdoor timber
Estimate deck fixings and finish from the selected layout
Count fixing locations and coated faces separately from the deck footprint.
Deck fixings follow the chosen fixing system and support layout. Finish follows the surfaces being coated. Neither quantity is fully determined by the deck's plan area alone.
Count a simple fixing schedule
For an illustrative layout with 21 board rows crossing eight support lines, there are 168 board-to-support intersections. If the specified system required two fixings at each intersection, that would be 336 fixings before allowance. Packs of 100 would round to four. Hidden clips, perimeter details and board-end joints can follow a different schedule.
Measure the coating scope
A 4 × 3 m deck has 12 m² of top footprint, but exposed edges, fascia and any required coating of other faces need separate consideration. Do not assume a top-area calculator includes the underside or every board edge.
Apply the selected finish rate
At an illustrative 8 m²/L per coat and two coats, 12 m² requires 3 L before allowance. Product suitability, timber condition and the actual application rate must be established from the finish instructions. A coating calculator cannot decide whether an existing finish is compatible.
Keep the order auditable
Name the fixing product and pack size, record the number of fixing locations, and list finish by product and colour. If the design changes its support spacing or board arrangement, revisit fixing quantities rather than only updating the board total.
Found a measurement or calculation issue? Send the example and your correction.