Squeaking Acrylic Shower Base

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Posted by: from Saint John
2/4/2019 at 9:52:14 PM

Is there anything I can do to stop squeaking and flexing in my main floor 48x36" acrylic shower base. The instructions weren't properly followed in using levelling mortar when it was installed and some of the levelling feet aren't touching the floor unless you stand in the shower causing the base to flex and squeak. I have a access to underside of the bathroom floor by removing ceiling tiles in the basement. Thanks!

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Viktor from Masonry B.M.C in Coldstream
Date/Time2/5/2019 at 1:06:13 AM

Yes take it out and replace it for a tile shower cabin!

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Date/Time2/5/2019 at 2:09:29 AM

I had a similar problem with a fibreglass tub that wasnt installed right and was able to fix it by emptying a can of sprayfoam underneath

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Date/Time2/5/2019 at 5:56:59 AM

If you have access to the underneath you can tray low expansion spray foam, if not I think you have two choices:

1) you live with it

2) you take all out and replace

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Thomas from Trusted Trades in Mount Forest
Date/Time2/5/2019 at 6:10:47 AM

Best answer has been said. Use low expansion spray foam, specifically window and door. Don't use to much, get it spread through out, underneath the shower base.

It will act as an adhesive from floor to base and at strength to the base, reducing movment.

Don't apply too much, dont want the base lifting.

Best of luck.


Tom Elliott

Elliott's Trusted Trades

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Gerard from Betterbuilt in Burlington
Date/Time2/5/2019 at 7:51:14 AM

Hi there...

Remove a couple of ceiling tiles underneath

Drillsome holes in the plywood floor directly under the shower base.

Inject low expasion foam......not too do not want the base to lift.

Hope this helps,


Gerard Schoeman


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Date/Time2/5/2019 at 10:29:14 AM

The spray foam idea can work. A few tips though.

Put some weight on top of it to stop the spray foam from lifting it if it's not attached well or if its a little flimsy.

Don't use it for a couple of days after to make sure the foam is completely set. If not your efforts will be for nothing.

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Date/Time2/5/2019 at 10:40:17 AM

Be careful. I contacted the mekers of "Great Stuff" and asked about their foam products. The low rising is meant for windows and doors. None of the canned products are meant for your application. There is a foam product for the purpose you describe but you are looking at about $350 for the product (which is a mixture of two chemicals.) I would suggest adding more mortar, if you can access the area, or, best scenario, replace the unit. Remember, foam is not a structural support product.Plus, in some cases, the chemicals leach into the unit and can discolour or weaken the integrity of the base material. Do some more research before making a quick fix ... and do it the right way.

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Date/Time2/5/2019 at 10:08:53 PM

Hey Stephen,

What I usually do after the bases are installed and plumbed is grab a spray foam can or two and just fill the voids the best I can all around the drain and feet and everywhere I can. Perform a walk test 24 hours later and should be good and help with movement.


SteveBuilt Inc.

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Cornel from Steopan Remodeling in Coquitlam
Date/Time2/6/2019 at 12:09:39 PM

There's little that makes me Craizier than a Squeaking Shower Fllor.

1.Subfllor flexing most of time, a noisy shower pan is actually due to plywood or shiplap subflooring flexing on a nail or screw.

2.Gaps between the pan and floor.

Sometimes squeaking are caused where the floor tile meets the shower pan.Normaly , there should be a slight gap between the shower pan and the floor tile.

3.Poor thinset. Look for a shower pan that allows you to use a mortar or thinset, underneath it.not all manufactures allows this but it can make for a sturdier shower.

4.Pan Screwed into wall studs.

Shower pan can , squeak when they ' re screwed into wall studs.

5.Wet Wooden floor.

Make sure to water Proof the area outside of your shower when wood swells and expands shower pan cause movement under your shower pan.

6.Heat expansion.Darker tile absorbs more than lighter tile.

7.Subfloor damage.Watch out for the quality of your bathrooms original or renavated subflooring.

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