Ndx Posted October 6, 2020 Report Share Posted October 6, 2020 Hi Guys, Going to digg 4 inches of soil... And compact 3/4 stone and on top frame ... Should I use 6x6 PT or 4x4 PT ? I will esentially frame a patio that will sit on gravel Thx ! Quote Link to comment Share on other sites More sharing options...
ratchett Posted October 7, 2020 Report Share Posted October 7, 2020 I've always seen people suggest 4x4's for the frame (be sure to toss in a few cross-braces as well). The only other suggestion I see is to make the frame an inch shorter on all sides so the water runs off the edges of the tub onto the stone, and not directly onto the PT frame Quote Link to comment Share on other sites More sharing options...
r5ran Posted October 7, 2020 Report Share Posted October 7, 2020 Hi, When I built my base, over 12 years ago, I did something very similar. I just used 4x4's on a bed of gravel topped with 6' treated decking, (I would use Trex today) . Been absolutely fine with no issues or shifting at all. Still perfectly level today. I figure, as long as the wood is 100 percent supported underneath, the thickness should not make a difference. Be sure to space them no more than 12 inches apart, for support, and intensely pack the gravel before hand. I included a couple pics, too. Randy 1 Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted October 7, 2020 Report Share Posted October 7, 2020 Nice pad. Well done. When I make them I do the same for the most part but I build it to the exact size of the spa's base so it under cuts the side panels and water runs to the ground and not onto the wood frame work. Then back fill in between the joists with limestone screenings flush with the top edge of the wood frame to lock it in place and keep animals from living in the void. I thoroughly wet down the limestone and pack/tamp it place. The limestone will be just like concrete when dry. Then no need for a wood deck on top...unless you want a wood deck. Quote Link to comment Share on other sites More sharing options...
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