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Sealing expansion joints

beerplease

Member
Joined
Aug 6, 2006
Messages
5
Ok, I just finished applying my new Epoxy Coat floor and it came out really nice on a 24 year old garage. The previous owner had actually filled in all the expansion joints with cement which I had to chip out! Now I would like to fill those back in with a semi flexible type of filler. Any recomendations as for what type of product to use. I would like it to be fairly flowable to apply and dry semi rigid to allow for expansion. I went to Lowes and currently have some concrete crack repair that comes in a tube. It is kinda hard to apply and dries in a concrete gray color which is quite a bit lighter than my gray floor. So I am not excatly sold on this poduct for my floor.
 
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Krodad

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Mar 25, 2006
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304
Location
Iowa
If you don't like the standard joint filler color, you could consider any of the urethane caulks...you can find them in more color choices nowadays. The urethane holds up better than just about any other sealant, IMO. If the joints are deep, consider a backer rod.
 

rt66jt

Active member
Joined
Aug 5, 2006
Messages
42
Location
York, PA
There are semi-ridgid joint fillers available; Pacific Polymers, Euclid (Euco 700, I think) and PolyGranite are some of them.
 

bmwpower

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When are the epoxy companies going to get off their **** and offer a joint filler to go with their epoxy? Makes sense to me.

Sika makes a product that is sold in Home Depot. It's in the concrete sealant aisle.
 
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boiler7904

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Apr 4, 2006
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NW IN
bmwpower said:
When are the epoxy companies going to get off their **** and offer a joint filler to go with their epoxy? Makes sense to me.

My guess is that they won't because they see one of two potential problems.

1. Average homeowner fills joints with a flexible filler prior to coating the floor. After a couple of weeks or months of traffic, the filler moves and the floor coating cracks. Homeowners complain about "failed" epoxy floor systems.

2. Average homeowner fills joints with a cementitious product and with time, the slab starts to move. Filler or slab gives way causing cracking or spalling. Homeowners complain about epoxy floor system destroying perfectly good slabs.

The R & D departments have a lot of work to do to make that sort of thing DIY idiot proof so they aren't constantly paying out on product liability claims.

On the other hand, professional applicators have a few materials that they use to fill joints. I can't think what the material is but the treatment is usually $1 or more per linear foot installed when contracted with a coated floor.


If you're looking for a good polyurethane sealant, take a look at Sonolastic NP-2. It's a pro-grade three component sealant meant for sealing of joints, can be submerged (like for dams) and is tintable to almost 500 colors. Availability for non-pros could be an issue though unless you can find it at a local contractor supply house. We spec this stuff all the time for exterior control joints between concrete sidewalks / driveways and buildings and at masonry control joints.
 

bmwpower

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Apr 24, 2005
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NJ
Should be an easy fix...Just tell the user to lay down the sealant AFTER the floor has been coated. If you can caulk a joint, you should be able to put down the sealant. Hell, if they just coated their floor with epoxy, they should be able to accomplish this last step. Having the company control which sealant is used should allow for a perfect color match of the product. Just seems like a easy way for an epoxy company to make their product stand out.
 
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