Joists and Deck Screws

To build a deck you need to make a frame of 47mm (2") section treated timber - this need not be graded C16. The size of joist is dependent upon the finished height of the deck eg for a deck 128mm (just over 5") high you need to use joists 100 x 47 (4" x 2"). The internal joists are usually at 450mm (18") centres.