Bathtub Install

[pushkins]

If it were me I'd be adding the 3/4 (treated) ply over the 1x8's, for three reasons.
1. Much better support base.
2. It will bring the floor up level with the remainder of the bathroom( you mentioned the remainder was 3/4 higher)
3. It will help stop critters coming up from below and under the tub.
I always add the 3/4 in as it makes a much better support base for tubs, we have all seen that old 1x8 material with cracks in it and "Murphy's Law" says the feet of the tub will sit right in the middle of two slats and in the middle of two joists.

I'd glue down the feet and then after all the install is done (plumbing, tile etc...etc... add some low expanding foam under the tub from the plumbing inspection hatch.

[Johnbear]

Again it depends on the condition of the floor when you take the tub up.







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