What are these things

[Nothing]

I just built a new house and I’m getting really excited to do the epoxy coating. While the temp isn’t in the right range, I’ve been walking around in the garage & getting my ideas together.

I have expansion joints around the entire edge of my new garage floor filled with some kind of soft, flakey material. I know back in the day they used wood. Don’t know what the new material is. I also have a foam barrier between the garage slab and the slab poured for the house. Pics will be attached.

The whole garage has this 4-6” lip running around it as well and I thought that if I put a paintable vinyl covebase around it it would also give me a way to cover the expansion joints?

What options do I have? Anyone else run into problems like this? I know that expansion material isn’t paintable but what solution do I have to resolve this?

In the last pic you can see that the foam is soft enough to cut.

Thanks





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[NUTTSGT]

Looking at the pictures on my phone, it appears to be celotex. A fiber board that has been used for years, more like decades for expansion joints. Celotex was a brand name for a cellulose board. I believe it has has some kind of asphalt impregnation in it.

I'd cut it down and fill the gap with something like Sikaflex.

 

[driftpin]

Pic #1 shows a wood partition wall, and the foam insulation and the fiber/asphalt expansion joint, yes? You are trying to decide what/how to cover the area from the garage concrete pour to the wall? What about an L-shaped piece of steel, fastened to the wall baseplate for the short-side of the L-shaped piece of steel, and letting the long side 'float?' You could use some type of flexible sealant on the L-long side, underneath, to prevent water migration.

Taking a closer look after posting the above, I now see that the partition wall is built upon some masonry construction, <1 ft high? And the narrow expansion joint is at the end of the slab, between the concrete and the concrete for the house? So, it's a floating slab? In that case I agree with NuttsGT, use a narrow oscillating tool to remove about 1/4" of the top of the expansion joint and fill the made-groove with Sikaflex.

 

[burleyfarm]

Looking at the pictures on my phone, it appears to be celotex. A fiber board that has been used for years, more like decades for expansion joints. Celotex was a brand name for a cellulose board. I believe it has has some kind of asphalt impregnation in it.

I'd cut it down and fill the gap with something like Sikaflex.

What NUTTSGT said.


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[Nothing]

Looking at the pictures on my phone, it appears to be celotex. A fiber board that has been used for years, more like decades for expansion joints. Celotex was a brand name for a cellulose board. I believe it has has some kind of asphalt impregnation in it.

I'd cut it down and fill the gap with something like Sikaflex.

Thank you. I have been distracted with closing and moving and kind of forgot about this post.

Thanks to everyone who answered.


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