Filling Expansion Joints with Epoxy

[theeld]

I would like to entertain opinions on those in the know on this idea. I do not plan on epoxy'ing the surace of the garage and will likely keep it raw concrete although I have treated it with a densifier/hardiner. I am curious as to the viability of filling the expansion joints with an epoxy product instead of sikaflex type compounds suggested most of the time. Is there an obvious reason not to do so? Is epoxy too brittle a substance once cured?

 

[jimgerken]

I recently finished a workshop with concrete floor. I chose Ashford Formula densifier. Of course there are 1/8" wide by an inch or so deep cut lines in it, so those I filled with self-leveling polyurethane crack sealant. Its easy to use, and looks good when done. I like the fact that now the cut lines wont fill up with dirt over time. And cracks that (hopefully) normally form in the bottom of these cut lines are now sealed, which stops radon, and keeps water on the floor from going down under the slab. The polyurethane remains very flexible, bonds to the concrete well, self leveling, comes in caulking tubes, is made just for this purpose, so seems like the right choice.

 

[nonhog]

I filled with self-leveling polyurethane crack sealant. polyurethane remains very flexible, bonds to the concrete well, self leveling, comes in caulking tubes, is made just for this purpose, so seems like the right choice.

Brand?

 

[DekeT]

The expansion is there for movement. Epoxy will act like an ineffective glue between the slabs. You want something that will flex.

 

[LegacyIndustrial]

Certain products are epoxy based and will flex as well. We have such a product.

 

[NitroShark]

I am curious as to the viability of filling the expansion joints with an epoxy product instead of sikaflex type compounds suggested most of the time. Is there an obvious reason not to do so? Is epoxy too brittle a substance once cured?

Do you really mean expansion joints?? if so, you need a flexible filler.


If you mean control joints and your slab is "settled" than Epoxy surfacing filler is fine. You will however need to feather edge it in.

In my case It took about 3-4 inches (the white stuff) to fill it level.




Shawn

Yours will look similar to what I did (your feather edges may very due to your level of surface.)

 

[Cobra6]

Here are some good tips from Alpha Garage

http://www.alphagarage.com/filling-joints-and-cracks.php

 

[Ch3No2]

Another option that has worked well for me a few times now.....

 

[theeld]

Sorry everyone, I meant CONTROL joints.