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Old 11-05-2019, 11:43 AM   #1
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Basement wall foam board


When putting up foam board on basemnt walls do you leave a 1/8gap on the bottom and silicone or should the foam board touch the floor?
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Old 11-05-2019, 11:50 AM   #2
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Re: Basement wall foam board


Yes you want it sealed or tight to the floor , not sure silicone is the right product
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Old 11-05-2019, 11:53 AM   #3
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Re: Basement wall foam board


+1.

Closed cell foam if the gap is larger or backer rod and an appropriate sealant. No need for silicone here. Waste of money. You need something that is foam compliant.
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Old 11-05-2019, 11:57 AM   #4
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Re: Basement wall foam board


Most silicone's would eat up the foam.
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Old 11-05-2019, 12:01 PM   #5
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Re: Basement wall foam board


From my point of view, it all depends on what is going on the top of the phone boards. Are you going to finish them off.

Are you going to frame out the walls and put electrical and sheet rock on? Or just leave them as is?

Regardless, since floor height varies, take a laser and find the highest and lowest points of the floor/wall join. Using the high point, mark up an 1/8 of an inch and then measure up the height of the board you are using and then set the laser level at that point. This way you will have an even top plane for the top of the board and a bottom that can be filled in with caulk/foam or some other substance.

Then, if you want to frame out, use treated for the bottom plate with a foam barrier and then drill and sink anchors to hold down the bottom plate or use power driven nails. Then put up top plate against the floor joists and fill in with studs cut to fit.

That's how I would do it. Now, let's wait for the pro's to tell how they would do it.
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Old 11-06-2019, 07:53 AM   #6
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Thank you guys yea definitely not silicone but probably foam spray. So I was thinking of leaving an 1/8 of gap and just filling the bottom with a bead of spray foam to make sure it’s sealed
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