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Old 11-17-2008, 11:11 PM   #16
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installing new bathtub, secure using construction adhesive or mortar?


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Originally Posted by MikeVila View Post
I'll have to go back and see how I can reconfigure my dimensions for my framing members for the island. I should be able to fix it without starting over lol. Alrighty then!!
You can always build up the sub-floor within your tub deck too. Just make it nice and sturdy and it's no different then the tub sitting on the sub-floor. Plywood and sleepers.

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Old 11-20-2008, 04:19 PM   #17
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installing new bathtub, secure using construction adhesive or mortar?


We have been manufacturing and installing our whirlpool & air massage bath tubs for over 20 years now and ALWAYS recommend using mortor.

Here is a link to our tub installation guide that will certainly be handy for your project: Carver Bath Tubs Installation Guide. Any other questions about the tub install..?
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Old 11-20-2008, 06:02 PM   #18
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installing new bathtub, secure using construction adhesive or mortar?


removed link.

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Old 12-04-2008, 10:22 PM   #19
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installing new bathtub, secure using construction adhesive or mortar?


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You need 1 bag of mortar. It weighs 50 lbs.

I'm not even going to go there in regard to mortar cooling the tub. That's wrong in about 50 different ways.

Bottom line is none of these tubs are constructed in a structural way, the exception is a cast iron tub and we aren't talking about those. Arcylic or fiberglass constructed tubs are not structural, they all flex they are all minimally engineered. To manufacturers shaving one extra ounce less of material equals $100,000 is savings over the life of that mold.

Mortar creates a solid base and eliminates flex. If you had two tubs one with mortar installation and one without and used them both you could easily tell us which one was installed which way just from use.

Mortar is the way professionals install tubs. DIYers will use anything but and come up with as many methods of mental masturbation as necessary to rationalize their choice.
My tub is a corner 5'x5' Kohler and is a very huge difference in strength compared with the old acrylic tub. I agree with you for a normal tub, one bag is enough, 1/2'' thick and the only solution is mortar; but for this tub i need 4 or 5 bags to fill the 2'' thick space under it. I think that is to much weight for a condo at the top floor.
The manufacturer indicate that the tub can be installed either with mortar or with adhesive.


Here is the thermal conductivity for some materials to give you an idea how fast your water get cold.
Cement, Portland 0.29 Concrete, stone 1.7 Air 0.025 Wood 0.04 - 0.4
The mortar under the tub cool down the water similar with a CPU cooler and if you have also air flow in the floor, you are set .

I know how it is to not have a cooler attached under the tub and for me is unacceptable that the water cool down so fast and if my tub allow me to do it without that cooler i will go for it.
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Old 03-02-2009, 04:46 PM   #20
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installing new bathtub, secure using construction adhesive or mortar?


I'm preparing to install an Advanta "Picadilly" bathtub by Maax. I know from experience and reading this thread that a mortar bed is the conventional approach. However, this tub has a two pararallel 2x4s fixed to the underside of the tub, half buried in the fiberglass reinforcement and running its length. A mortar bed would have to be over 3" deep! Plus it would be a royal mess trying to get the tub out down the road. The instructions indicate that the tub should be set directly on the floor, and blocked to prevent movement. No mention of a mortar bed. The Maax website indicates that their tubs are designed "in such a way that they do not require a mortar bed." However mortar is recommended to level the floor. The bottom of the tub is very thick and stiff. Mortar just doesn't seem to make sense in this case. Any recommendations or experience with these tubs?

I'd like to avoid the hollow sound that I'd likely experience without a solid base.
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Old 03-02-2009, 05:35 PM   #21
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installing new bathtub, secure using construction adhesive or mortar?


If I understand correctly, the 2x4s leave you a hollow space down the middle of the tub that you'd prefer to be solid. How about filling that space with layers of foam board to bring the bottom of the tub flush with the reinforcing 2x4s, and then use a thin mortar bed (enough to allow the surfaces of the 2x4s and foam to meet the subfloor)? It would eliminate the hollow sound/feel while adding a bit of insulating against the cold. Construction adhesive (preferably silicone based such as CWS) would work well for holding the foamboard to the tub bottom.
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Old 03-02-2009, 07:56 PM   #22
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installing new bathtub, secure using construction adhesive or mortar?


I was in the same dellema of what to use mortar or glue. Brother in law convinced me to go with mortar. It worked out fine, not cold as I insulated the sides of tub. A short time later had guests stay overnight. Hubby and wife had a nice jaccuzzi togeather, I was glad I had used mortar, togeather they were over 500 pounds of loving in my tub....uuuck the thought of it all..lol

Hope this helps
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Old 03-05-2009, 07:48 AM   #23
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installing new bathtub, secure using construction adhesive or mortar?


For anyone out there with similar confusion regarding Maax Advanta tubs... Maax customer service replied to me that using a mortar bed is "strongly recommended. In fact, it's the best way to install."

Why the heck don't they just put this in their installation instructions? The install documents make no mention of mortar. The Maax website simply indicates that a mortar bed is "not required."

The only explanation I can come up with is liability involving DIYers. Strange indeed.
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Old 03-05-2009, 11:17 AM   #24
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installing new bathtub, secure using construction adhesive or mortar?


I installed an acrylic tub years ago and didn't use the optional mortar bed. Boy did I regret that. The tub just didn't feel solid enough and would squeek. Next acrylic tub I install will be with a mortar bed.
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Old 03-05-2009, 01:47 PM   #25
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installing new bathtub, secure using construction adhesive or mortar?


Thanks, I definitely plan to do so myself.

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