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  neil rourke November 21, 2012 at 9:29pm

  hi andy,personally i would avoid supporting from within the pond.Maybe you could run a double 150 x50 mm bolted together along length of deck (3m)both front and back ,1.4m apart. These need bolting to 2 or 3 posts which will need to be concreted into ground to prevent 'lift'. the front one will obviously want support as close to pond as poss.
  Then 100 x 50 mm joists across these @ 400 centres (2m long) and decking running 3m lenght ways.
  The only drawback may be the increase in deck height,depending on ground levels.I would do a sketch but would take me a week! hope this is some help
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  Andy Westacott November 21, 2012 at 9:36pm

  Thanks Neil, I think you're right, the only way is going to be to get the posts in as close to the pond as possible then run timbers off that strong enough to not be supported, so doubling up might be the answers. cheers
• PRO

  Graham Parker November 24, 2012 at 1:32pm

  Hi Andy

  We had this problem a couple of years ago. The client wanted a jetty out into his pond which was lined. We solved this by using Elm posts which we concreted into old tyres and wrapped with liner. We then dropped these into the pond and attached the framework as required. You might need to brace the leg so it does not spread but we have had no problems with ours.

  We used Elm as this will last for ever in water.
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  Ian Price November 24, 2012 at 5:28pm

  Hi Andy
  
  I would avoid pond side posts at all costs if possible. I have designed and built a couple of deck and cantalevered them all. Www.ianpricedesign.com and the Seven Mile Straight project shows what I did using 6x2 and 8x4 new sleepers.
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  Andy Westacott November 24, 2012 at 8:57pm

  Thanks for all the advice everyone, think cantilever will be the way forward on this one as it's only one corner that is over water. many thanks
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  Ian Price November 24, 2012 at 11:40pm

  http://www.ianpricedesign.com/project_detail.php?selID=8 here's the link to the portfolio page - couldn't copy and paste from phone earlier...
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  Gareth Wilson November 25, 2012 at 11:59am

  I would use a cantilever method with tannalised joists as mentioned above and either use threaded bar or bolts. It is essential to concrete the posts holding the deck in position with a good depth and width of concrete, I also use threaded bar on the bottom of the posts ( in the bottom of the hole before you pour the concrete) as this gives you extra stability.
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  Thermo November 25, 2012 at 7:25pm

  weve done a couple. one we used oak sleepers for posts and canitlevered off of those. On another one we used small steel sections