Use our Project Calculator to help plan and cost your Composite Deck. Just enter size of the area to be decked in m2 and it will do the maths for you!
Number of decking boards per m2 = 1.72
Example: 20m2 deck would be 20 x 1.72 = 34.4 so you would need 35 decking boards PLUS a further 5% on for offcuts or wastage.
Check your sums! Many people think a 5 x 5 deck is 5m2, it is not, it would be 25m2. Width x Length = m2.
If you need to work out the m2 from the number of decking boards, divide by 1.72.
Example: 100 decking boards / 1.72 = 58m2 deck.
REMEMBER TO ADD 5% FOR WASTAGE
You will need: 1 bag per 5m2 for 6mm fasteners. For example a 25m2 deck would need 5 bags. 25/5 = 5.
PLUS you will need: 1 bag per 25m2 for starter fasteners. For example a 36m2 deck would need 2 bags of starter fasteners. 36/25 = 1.44.
FASCIA, TRIM & JOISTS
Fascia boards and corner trims depend on the perimeter size of your deck. Each length is 2.2m.
Example: A 4x5 deck would be 18 linear meters perimeter.
18/2.2 = 9 lengths.