Basic Deck Screw Math The number of screws needed for a deck depends on the square footage of the deck and a few other factors. You'll also have to know the joist spacing since the screws go through the deck boards into the joists. The width of the deck boards also matters, as you'...
The width of the lumber may be a factor in its price (wider boards cost more), but for most lumber that you buy, you just need to know the linear feet. For some projects, like building a backyard deck, you will need to be able to convert square footage into linear feet of building...