I have a kind of unusual project that I am planning and need some advice. I have a super single waterbed that I want to elevate so that I can create a large storage area underneath.
The mattress is 48"x84"x8". Once you've done the conversions involved, this equates to 1120 lbs of water. The waterbed currently sits on top of a 1/2"x4'x84" piece of OSB, which sits atop a 1/2" OSB boxed frame with some diagonally positioned cross pieces of 1/2" OSB.
My plan is to place the mattress on a 1/2"x4'x84" piece of plywood. Supporting the plywood will be (7) 4"x4"x4' posts placed on 14" centers across the width of the bed. My plan is to then use (2 or 3) 4"x6"x84" Douglas Fir posts placed lengthwise under the 4"x4" posts. I would then stand 4"x4"x5' posts under the corners and one on each side in the middle (if necessary, based on your input).
I plan to use other lumber (2x4s, etc.) to tie all of the framework together so that it doesn't move.
My questions are these. Does this sound like enough support for this kind of weight? Can I get away with using just 2 of the 4x6s or do I need the third one down the center lengthwise? Are the 4x6s on the outer edges stout enough so that I don't have to add the center support lengthwise at 24"?
Ultimately, I want to have as much access to the storage area as possible without having posts in the way. A free open space with only 4 corner posts would be ideal, but not sure if I can get away with it.
Any/all advice/input/recommendations or changes to this plan will be greatly appreciated. Thank you for your time and consideration. Rob
The mattress is 48"x84"x8". Once you've done the conversions involved, this equates to 1120 lbs of water. The waterbed currently sits on top of a 1/2"x4'x84" piece of OSB, which sits atop a 1/2" OSB boxed frame with some diagonally positioned cross pieces of 1/2" OSB.
My plan is to place the mattress on a 1/2"x4'x84" piece of plywood. Supporting the plywood will be (7) 4"x4"x4' posts placed on 14" centers across the width of the bed. My plan is to then use (2 or 3) 4"x6"x84" Douglas Fir posts placed lengthwise under the 4"x4" posts. I would then stand 4"x4"x5' posts under the corners and one on each side in the middle (if necessary, based on your input).
I plan to use other lumber (2x4s, etc.) to tie all of the framework together so that it doesn't move.
My questions are these. Does this sound like enough support for this kind of weight? Can I get away with using just 2 of the 4x6s or do I need the third one down the center lengthwise? Are the 4x6s on the outer edges stout enough so that I don't have to add the center support lengthwise at 24"?
Ultimately, I want to have as much access to the storage area as possible without having posts in the way. A free open space with only 4 corner posts would be ideal, but not sure if I can get away with it.
Any/all advice/input/recommendations or changes to this plan will be greatly appreciated. Thank you for your time and consideration. Rob