Good ideas aeray, I forgot about expanding foam. If the tub is lightweight acrylic and alot of foam is used it could lift the tub out of the frame (I saw this happen with the tray in a shower cubicle). Maybe put the plug in the tub and put a little water in it to hold it down untill the foam sets?
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As caarnted wrote, I frame it in with 2x4s and then use a piece of 3/4" OSB or CDX plywood over the top. If the bottom edge of the rim of the tub sits 20" above the floor (an example) I would frame the enclosure so that the top surface (including the tile/underlayment/etc) is 21" above the floor to leave room for the mortar underneath it. A faster, and warmer, method of setting the base is to use expanding spray foam WITH A PIECE OF VISQUENE OVER IT instead of the mortar. You should put the plastic over the mortar as well. You need to be able to get the tub out and having it stuck to the mortar or foam makes this difficult. Also, you need to provide an access hatch somewhere in the side of the enclosure to get at the plumbing, especially if it is a jetted tub. Often, you can hide this hatch inside a cabinet ar in another room.
I would like some more details please, sir.
The frame can be built from the same materials as an internal wall in your house ( 3*2 pine in my place) and can be constructed in the same manner. It should fit up under the rim of the tub and look like a miniture wall frame. Make sure you do a good job with the waterproofing after you box the tub in. You can also use bricks to box in and support the tub if your floor is suitable, then tile over the top. The tub can sit as high off the floor as you like, as you need to mix up a bed of sand /cement and set the tub on this and squish it down (without getting in it) into your frame. This will support the weight of the tub, the water and you. The frame is really only to steady the tub and to box it in. This is especially important if the tub is fibreglass or acryllic as it will flex if unsupported. Once the tub is set do not get in it for any reason untill the sand/cement is dry as it will squish down too much and pop back up leaving a gap that will allow the tub to move every time you get in it. Don't forget to position the waste pipe correctly. Hope this helps, it probably is a bit confusing if you have never done it before. Oh yeah, if your shower is over your tub, you may have to recess it into any adjoining walls to catch the runoff water.