ModWood Decking and Fastener Calculator » ModWood ModWood Decking and Fastener Calculator. Please enter the area of the Deck in m². Area 1. Area 2. Area 3. Area 4. Total Area. Decking. Do You have a colour in mind? Select a colour, Sahara, Jarrah, Black Bean, Silver Gum. What width board do you wish to use? Select a width, 88mm, 137mm. Do you need to include..