Wow...what a mess!! So..Harry...? Now that we have seen what NOT to do, do you have any pics of what the ideal situation is? Just curious, altho I am not planning a deck-type installation of my Jacuzzi...(no space, gotta go with a prefab deck.)
SS

Hi Susie
There are some photos linked from the main page of this site which show proper methods of prep for tile, but ideally ... the cement backerboard should be installed over straight kiln dried lumber and taped along all the edges and mudded with thinset mortar.

Ah....now that makes sense! I was sitting here looking at the pics and reading your comments thinking that it would be like painting over the studs instead of dry-walling first. Guess I had the idea...hmm? I keep running the scenario over in my head where I step in the tub and the tiles fall to the floor on the edge...lol. Guess Ill hang out here and learn all the things I need to learn before building my dream house...

*thinset mortar..thinset mortar..thinset mortar...just drummning that into the space between my ears*

Alot of the directions that come with the tubs show the tub sitting on the lip of the deck.I always insist the tub sits up higher than the deck or is removed altogether before the tile goes in.If the tub is set properly most of the weight will be on the mortar that is set onto at the subfloor anyway and there will be very little weight at the tub deck itself.
Water will migrate through most tile so it does bot matter if there is a pinhole or not in the plasterboard cause the moisture will go through the grout and/or the tile and soak the board anyway thus causing failure.There is a movemnet here in the states that is banning the use of the greenboard around wet areas,don't know if Cananda is in that or not is it?
Been around a few of tile sites around the net and this is one of the few where you guy's know your stuff. Nice to know there are some around who care about what they do still.

TAlked to a Plumber buddy of mine. The best way for a tub like this to be installed is for it to be set in place with mortar on the floor. Setting the Tub in place like this will then take all the load bearing weight of the Deck top where the Jacuzzi sits. All the weight will be on the floor.

I agree. I sometimes use the spray tubes of insulation (the stuff that expands). The tub should be almost full of water though when you do it otherwise the tub will be closer to the ceiling than you want it.

Here's a link to a job I'm doing right now. It inludes building the shower and jacuzzi frame / deck. It's quite a contrast to how most builders prepare for tile work.
Shower and Jacuzzi from scratch.