Quick decking question

6 May 2011
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United Kingdom
Hi, haven't been on here for a while.
Looking at ordering materials for decking for the weekend, and the local timber merchant do a 120mm x 28mm board and a 145mm x 28mm board.
Just wondered what the pros and cons were of the different sizes. It is a fairly large deck (aprox 35 sq m).
Also, if I am using 100mm x 50mm joists, how far apart should the supports be? I was thinking about 1500mm, too much or not enough?
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Sorry I don't think I explained very well. The spacing of the joists will be about 500 mm but as the deck will be slightly raised I was wondering how many supports will be needed along the length of the joist. Joists will be 6m long (2 x 3m joists with a post support in between).
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