Fiberglass Tub For Basement Bathroom - Plumbing - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Display Modes
Old 10-11-2012, 03:09 PM   #1
Join Date: Jul 2012
Location: Lockport Illinois
Posts: 82
Rewards Points: 111

Fiberglass tub for basement bathroom


Have a few questions regarding installing a fiberglass tub for a basement bathroom.

I am in the process of finishing my basement, and have installed a subfloor system for vapor barrier and some r value insulation. I was debating between placing the tub directly on the subfloor, or cutting out a whole in the subfloor, the exact size of the tub, and place the tub on the concrete slab. See below for my questions.

1. By putting the tub right on the concrete floor, wouldn't the tub floor that you stand on (or sit on) get cold due to being directly on the concrete? Is there some way to insulate the underside of the tub, or the tub floor?

2. Would it be wise to install the tub on the subfloor, having just a small box cut out of subfloor (matching the size of the concrete dap out) to fit the trap and drain? That way the tub is up off the concrete.

3. Do tubs ever get small micro cracks in them (the floor part that you stand on), where water can leak through these cracks from the tub floor, onto the floor below? If the tub were directly on the concrete, this water would flow onto the concrete slab, but if I had the tub on the subfloor, this water would flow onto the subfloor, eventually leading to rot, mold, etc. I had a contractor friend mention these possible micro cracks to me, so just wanted to see what would be the better way to go.

4. I read on an online post somewhere, that said when installing a tub, you should use a product like structo-lite (spelling, similar to a mortar bed for the tub) so it gets set in place, and can not move. Anyone heard of this product, or use something similar?

Any info you can provide would be great.

Thanks in advance,


svaic00 is offline   Reply With Quote
Old 10-11-2012, 04:30 PM   #2
DIY staff

Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 25,728
Rewards Points: 7,174

I would set the tub right on the new subfloor---that way the tub will be at the correct height and not buried--

That should minimize the movement between the subfloor and the tub.

Many fiberglass tubs have a styrofoam base under it---if so then a very thin bed of masons mortar will fill the voids.
if it's hollow--a thick bed of mortar will be needed.

As to leaks? Rare----a flood under the subfloor or on top is going to cost you money---so get a good tub.


New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Best option for Bathroom Ceiling Paint? tealab Painting 7 04-05-2013 04:49 PM
difference between fiberglass insulation for house and ovens Druidia Insulation 2 08-03-2012 08:44 AM
How to select appropriate Bathroom Lighting crescentharbor1 Kitchen & Bath Remodeling 1 02-28-2011 09:47 PM
gutting bathroom debiasio Remodeling 30 02-17-2011 02:32 PM
cellulose over blown in fiberglass? deerhunter Building & Construction 1 10-29-2010 10:16 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1