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Old 05-05-2012, 01:37 AM   #1
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building a frame 18" tall to fill with gravel to support a hot tub 5000lbs


I have a raised deck and want to sink a hot tub in it but to do that I have to raise the hot tub off the ground 18". I have been told that I can use gravel and pack it in layers until I reach the desired height needed but to frame it in with PT wood to prevent the gravel from spreading out over time with the weight. Just wondering what the recommended materials for this job would be and the best way to do this

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Old 05-05-2012, 06:31 AM   #2
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building a frame 18" tall to fill with gravel to support a hot tub 5000lbs


is that 18" off the ground? suggestion 12"-2 X 6s frame the opening then cross members like when a deck goes down.seems to me the rock will push against the perimeter support of the tub..better it supports off all the 2X6s instead as it is dropped down into place.is that dirt or sand under the exsisting deck?check out the cross member supports and make it free of the exsisting deck...


Last edited by biggles; 05-05-2012 at 06:39 AM.
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Old 05-05-2012, 07:57 AM   #3
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building a frame 18" tall to fill with gravel to support a hot tub 5000lbs


Quote:
Originally Posted by beachcomber tub View Post
I have a raised deck and want to sink a hot tub in it...
That's too bad.
To support the tub well/right will mean taking a lot of the existing deck apart at least (and maybe some of the structure too) to make room for the support the tub will need and to set it at the right elevation etc and as a separate support system from the deck itself.

Otherwise you're on the right tack.

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I have to raise (and support) the hot tub off the ground by 18".
I can use gravel and pack it in layers... frame it in with PT wood (or CMU)
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Old 05-05-2012, 09:05 AM   #4
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building a frame 18" tall to fill with gravel to support a hot tub 5000lbs


I was going to build the support this way but after talking to our local building inspector he advised if the hot tub is sitting on wood structure I would have to get an engineer certificate, but he then advised I could bring in enough packed gravel to raise the ground and advised it should be framed in so the dirt does not push out with the weight over time since it is being raised 18 inches and an engineer certificate wont be required.
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