Is There A Good Foam For Under A Tub? - General Discussion - Contractor Talk

Is There A Good Foam For Under A Tub?

 
Thread Tools Search this Thread Display Modes
Old 10-04-2018, 05:06 PM   #1
Pro
 
JT Wood's Avatar
 
Trade: carpenter
Join Date: Dec 2007
Location: Calgary Ab Canada
Posts: 3,587
Rewards Points: 2,550

Is There A Good Foam For Under A Tub?


In my personal house I have a 1 piece tub shower. I believe the floor is 7/16 osb embedded in fiberglass. I've noticed that the floor is far more spongy than the other 2 I have. I don't suspect a leak, or any major impact. I'm about to cover up my ceiling in the basement, which will mean I can't access the floor anymore. Im thinking about filling the tub half full of water and spraying some foam under there in an effort to help stop the deflection. Has anyone done this, and can they recommend a type? Im guessing I want closed cell.? Thanks

Sent from my SM-G935W8 using Tapatalk
__________________
Airdrie AB Renovation Contractor | Kitchen Renovations | Basement Developments | Facebook
JT Wood Construction Serves Airdrie, Cochrane, Olds, Mountainview, Rockyview and Crossfield, Alberta.
JT Wood is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 10-04-2018, 05:28 PM   #2
Pro
 
Tom M's Avatar
 
Trade: GC/ Interior & Exterior Remodeling
Join Date: Jan 2007
Location: Bergen County, NJ
Posts: 8,776
Rewards Points: 9,036

Re: Is There A Good Foam For Under A Tub?


Its worth a shot. Ive done it with Great Stuff Gap filler and it does wonders.


Just make sure to over pump it so its ends up denser after it spreads out

Advertisement

Tom M is online now  
Old 10-04-2018, 05:34 PM   #3
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 7,530
Rewards Points: 15,251

Re: Is There A Good Foam For Under A Tub?


I would forget about filling the tub halfway. That's an old wives tail for caulking, and mostly a waste of time.
MarkJames is offline  
   
 
Old 10-04-2018, 05:41 PM   #4
Pro
 
t.carpenter00's Avatar
 
Trade: excavating/ drywall/ currently remodeling
Join Date: Jan 2018
Posts: 126
Rewards Points: 258

Re: Is There A Good Foam For Under A Tub?


We usually mix a bucket of 90 min joint compound and push it under there. Cheap, won't compact, and won't break up.

Sent from my VS988 using Tapatalk
t.carpenter00 is offline  
The Following User Says Thank You to t.carpenter00 For This Useful Post:
Mordekyle (10-05-2018)
Old 10-04-2018, 06:28 PM   #5
Pro
 
rrk's Avatar
 
Trade: remodeling
Join Date: Apr 2012
Location: new jersey
Posts: 5,037
Rewards Points: 3,362

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by t.carpenter00 View Post
We usually mix a bucket of 90 min joint compound and push it under there. Cheap, won't compact, and won't break up.

Sent from my VS988 using Tapatalk
you missed the part of no access
rrk is online now  
Old 10-04-2018, 06:36 PM   #6
Capra aegagrus

 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 22,547
Rewards Points: 22

Re: Is There A Good Foam For Under A Tub?


If the bathroom floor has proper joist spacing and sheathing, the place to address any "sponginess" is on top of the sheathing, not underneath it. The unit should have been set atop a base of mortar, thinset or foam. Unlikely anything underneath the sheathing is going to have any effect at all.
Tinstaafl is offline  
Old 10-04-2018, 07:11 PM   #7
Pro
 
Big Johnson's Avatar
 
Trade: Contractor and Grunt
Join Date: Jun 2017
Location: Michigan
Posts: 2,628
Rewards Points: 6,103

Re: Is There A Good Foam For Under A Tub?


Never fill the tub with any water when setting it in a bed of anything.
Big Johnson is offline  
Old 10-04-2018, 07:14 PM   #8
Pro
 
rrk's Avatar
 
Trade: remodeling
Join Date: Apr 2012
Location: new jersey
Posts: 5,037
Rewards Points: 3,362

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by Tinstaafl View Post
If the bathroom floor has proper joist spacing and sheathing, the place to address any "sponginess" is on top of the sheathing, not underneath it. The unit should have been set atop a base of mortar, thinset or foam. Unlikely anything underneath the sheathing is going to have any effect at all.
I think he is going to drill a hole and shoot it through the hole
rrk is online now  
The Following User Says Thank You to rrk For This Useful Post:
JT Wood (10-05-2018)
Old 10-04-2018, 07:52 PM   #9
Pro
 
Tom M's Avatar
 
Trade: GC/ Interior & Exterior Remodeling
Join Date: Jan 2007
Location: Bergen County, NJ
Posts: 8,776
Rewards Points: 9,036

Re: Is There A Good Foam For Under A Tub?


I use structolite on new installs. But when I came across something creaky and my only access was from the bottom I drilled a series of 1/4 holes spread around.
With the holes I stick the tip of the foam gun in it and blast until I see it ooze from a nieghboring hole.
Tom M is online now  
The Following User Says Thank You to Tom M For This Useful Post:
JT Wood (10-05-2018)
Old 10-04-2018, 08:26 PM   #10
Capra aegagrus

 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 22,547
Rewards Points: 22

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by rrk View Post
I think he is going to drill a hole and shoot it through the hole
With my luck, I'd punch right through the tub bottom, guaranteed.
Tinstaafl is offline  
The Following 2 Users Say Thank You to Tinstaafl For This Useful Post:
JT Wood (10-05-2018), rrk (10-04-2018)
Old 10-05-2018, 04:32 AM   #11
New Guy
 
jeffmattero76's Avatar
 
Trade: Property Manager
Join Date: Mar 2018
Posts: 25
Rewards Points: 50

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by rrk View Post
you missed the part of no access
The OP posted that AFTER he covers his basement ceiling he will have no access. Currently, he DOES have access as I read it.

Sent from my SM-G530T using Tapatalk
jeffmattero76 is online now  
Old 10-05-2018, 07:28 AM   #12
Pro
 
Big Johnson's Avatar
 
Trade: Contractor and Grunt
Join Date: Jun 2017
Location: Michigan
Posts: 2,628
Rewards Points: 6,103

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by jeffmattero76 View Post
The OP posted that AFTER he covers his basement ceiling he will have no access. Currently, he DOES have access as I read it.

Sent from my SM-G530T using Tapatalk
He currently has access to the subfloor underneath the tub, he won’t once he drywall’s the ceiling in his basement which is below the tub.
Big Johnson is offline  
The Following User Says Thank You to Big Johnson For This Useful Post:
JT Wood (10-05-2018)
Old 10-05-2018, 09:04 AM   #13
New Guy
 
jeffmattero76's Avatar
 
Trade: Property Manager
Join Date: Mar 2018
Posts: 25
Rewards Points: 50

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by Big Johnson View Post
He currently has access to the subfloor underneath the tub, he won’t once he drywall’s the ceiling in his basement which is below the tub.
Correct. That was what I stated.

Sent from my SM-G530T using Tapatalk
jeffmattero76 is online now  
Old 10-05-2018, 09:07 AM   #14
Pro
 
Mordekyle's Avatar
 
Join Date: May 2014
Posts: 1,866
Rewards Points: 3,908

Re: Is There A Good Foam For Under A Tub?


I’ve used the door and windows foam with success.


Sent from my iPhone using Tapatalk
Mordekyle is online now  
Old 10-05-2018, 09:41 AM   #15
Pro
 
rrk's Avatar
 
Trade: remodeling
Join Date: Apr 2012
Location: new jersey
Posts: 5,037
Rewards Points: 3,362

Re: Is There A Good Foam For Under A Tub?


Quote:
Originally Posted by jeffmattero76 View Post
The OP posted that AFTER he covers his basement ceiling he will have no access. Currently, he DOES have access as I read it.

Sent from my SM-G530T using Tapatalk
explain how to put drywall mud between a tub and subfloor from below the subfloor
rrk is online now  
Old 10-05-2018, 09:55 AM   #16
New Guy
 
jeffmattero76's Avatar
 
Trade: Property Manager
Join Date: Mar 2018
Posts: 25
Rewards Points: 50

Re: Is There A Good Foam For Under A Tub?


I didn't say that was possible. I simply stated that the OP comment stated that he wanted to support it BEFORE he lost access by drywalling the basement ceiling.

My guess, as others have stated, is that the OP intends to drill holes in the subfloor and spray expanding foam under the tub. I don't believe he said anything about using drywall mud.
Quote:
Originally Posted by rrk View Post
explain how to put drywall mud between a tub and subfloor from below the subfloor
Sent from my SM-G530T using Tapatalk
jeffmattero76 is online now  
Old 10-05-2018, 09:44 PM   #17
Pro
 
JT Wood's Avatar
 
Trade: carpenter
Join Date: Dec 2007
Location: Calgary Ab Canada
Posts: 3,587
Rewards Points: 2,550

Re: Is There A Good Foam For Under A Tub?


Yes, the tub is on the main floor. I have partial access to the floor sheathing under the tub. (Drill Holes) These tubs are designed, and have built in feet to just simply put it in place and screw it to the walls. The bottom of the tub is actually a couple inches off the subfloor. We'e used probably 100 of these, and I have 2 others in my place that are rock solid on the base. I'm confident its not an installation issue.

It may be that this one was bad, or maybe someone fell in there and keeping it a secret. I honestly don't know. It's been this way for about a year that I've noticed with no real change, it just feels soft. I was concerned that the standard great stuff, may lose its structure after a couple years.

I thought if I put a 150 lb or so then added the foam, it would be less likely to cause problems, down the road. It sounds like it's not a concern.

Like tin says, My absolute biggest concern is putting 15 quarter inch holes in the bottom of the tub.
__________________
Airdrie AB Renovation Contractor | Kitchen Renovations | Basement Developments | Facebook
JT Wood Construction Serves Airdrie, Cochrane, Olds, Mountainview, Rockyview and Crossfield, Alberta.
JT Wood is offline  
Old 10-05-2018, 11:07 PM   #18
Contractor of the Month
 
Inner10's Avatar
 
Trade: Control Systems
Join Date: Mar 2009
Location: Ottawa, ON
Posts: 24,442
Rewards Points: 1,550

Re: Is There A Good Foam For Under A Tub?


I did it and it made my tub creak like a bastard...
__________________
The Following User Says Thank You to Inner10 For This Useful Post: Leo G
Inner10 is online now  
The Following User Says Thank You to Inner10 For This Useful Post:
JT Wood (10-05-2018)
Old 10-06-2018, 07:54 AM   #19
New Guy
 
jeffmattero76's Avatar
 
Trade: Property Manager
Join Date: Mar 2018
Posts: 25
Rewards Points: 50

Re: Is There A Good Foam For Under A Tub?


Is there a "trouble door" at the faucet end of the tub? If so, you may be able to hammer in a few wedges to raise the tub slightly, and the squash in some structolite as far as you can push it under the tub, then remove the wedges. Let it sit for 24 hours before using the tub.

Sent from my SM-G530T using Tapatalk

Advertisement

jeffmattero76 is online now  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Design programs Kent Whitten Drafting & CAD Forum 72 04-24-2016 02:38 PM
Roofing Salesmen DALLAS - Good Fast Pay theADAM Help Wanted or Looking For Work 1 01-24-2015 10:46 AM
Good New Year Start greg24k General Discussion 30 01-22-2013 09:08 PM
Good Deals this week. Tylerwalker32 Tools & Equipment 2 11-27-2012 11:35 PM
Solving the Housing Crisis, this is lengthy but good reading PMI General Discussion 11 03-17-2011 02:50 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?