No room to lift tub over mortar

[v6ranger]

Hello. Apologies if this is a repeat question, but I did search to no avail.

I'm installing this tub in a downstairs washroom. It's a 2-piece tub/enclosure where the enclosure gets screwed into tub before moving it into its final resting place. Floor is level, but mortar reinforcement is needed since the tub only has the one leg + skirt/apron. The issue is that with the attached enclosure and the low ceiling, that there's no room to lift it above the eventual mortar piles.

Anyone see any issue with adding/securing 3 more wooden supports to the base and mimicking the one existing? The one existing is a 2x4 that's tapered about half an inch from one end to the other.

Closed-cell spray foam is the other option, but I think wooden supports would offer more guaranteed support.

Thanks! (yes, this is my first time doing this...haha)

 

[Chucky_ott]

What do the tub instructions say? Probably the skirt and the 2x4 runner will provide enough support.

The fiberglass tub I recently installed just had the skirt and two 4x4 posts to support the load. But I did set those posts on a mortar bed to ensure they contacted the subfloor. I did this solo and had to raise the tub by a few inches with a pulley on the ceiling. Just enough for me to get my hand under there and squeeze in some mortar. Then I gently dropped the tub down.

I didn't quite understand your description. Did you intend to have a 4" bed that reaches the 7 slats? Or just under the runner?

BTW, what's your subfloor structure like? It might be flat but can it support a large tub full of water?