What is the difference in Epoxy and Polyurethane in concrete crack injections?
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- เผยแพร่เมื่อ 28 ก.ย. 2024
- What is Epoxy and Polyurethane? Easy way to remember is Polyurethane expands and Epoxy does not. While the expansive properties of Polyurethane help to fill all the voids in a crack, the material is inherently weaker.
Both will fix a foundation crack and stop water. The major differences are 2-fold. Firstly, Epoxy will last longer and has a call-back rate 1/10th that of Polyurethane. Secondly, should an Epoxy-injected crack open back up, it is easy to reinject. If a Polyurethane crack opens back up, it almost always needs to be dug out from the exterior and sealed, a much more expensive proposition.
This is why we decided as a company to use Epoxy over Polyurethane. Epoxy is harder and takes more training in order to complete correctly, however the results are better and will last longer.
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Excellent video explaining the difference, thank you.
You're very welcome, Mikey!
Hi i just want to confirm how will your epoxy bond to a wet wall usualy all epoxys need dry wall if you are fixing water leak the wall will be wet?
Hello! You are correct, epoxies do not stick to a wet wall. In the case of a leaking crack, we will build a Hydraulic Cement Surface Patch with diverting tubes that moves the water and creates a dry surface for our epoxy to bond to. From there, we can inject the crack and stop the leak!
@@Therealsealllc I'd like to hear more about this method. You have a seam in the wall you fill with hydraulic ... but where do the tubes go, and where does the epoxy go, into a spot not leaking? Thx.
Great information. Walls are not designed to move, makes sense to me.
Thanks Jeff! Walls are definitely designed to stay put!
Currently repairing a crack in foundation previous owner botched / failed back in 2016. It’s a stress crack going from corner of window, diagonally to the footing. Crack leaks slowly into our basement. Currently have it excavated to the footing, and clean. About a 3-4 ft long crack 1/4” at most in places. A foundation guy has told me the best thing to do is use water proof hydraulic cement and tar. Why would I not use epoxy injection + tar covering on exterior. Would there be a reason hydraulic cement would be better than epoxy on exterior crack repair? PLEASE HELP STUCK IN LIMBO😂
Hi @elibrown7531!
Epoxy injection is best done from the inside. With a finished basement, you can end up injecting epoxy into your home, which is not ideal.
So while epoxy injection is the best solution from the interior, from the exterior the best solution is to clean the wall, use hydraulic cement over the crack, and then an elastomeric tar over that.
A protective barrier like a plastic sheeting or a foam board is ideal as well to prevent the tar from being scraped off during back fill and compression of the dirt.
Yes, both materials theoretically get injected into cracks, however, they are two different products each with their own solution. Also, you may (will) get different results using a pump rather than a cartridge system.
Absolutely right! Different products yield different results. We prefer epoxy, as it is stronger, lasts longer, and has a much smaller call-back rate.
The method of injection does not matter, however. Weather you use a pump or cartridge, the epoxy is pressure-injected into the crack. Epoxy doesn't know it's being pushed by a hand pump or a machine-pump. It only knows it is being pushed.
Plus, those machines tend to leak and break down. Nobody wants epoxy leaked on their kitchen floor as a tech brings a machine in. In fact, the techs have a better "feel" for the resistance of the hand-pump cartridges, and therefore also have fewer blowouts.
Long story short; use epoxy from a hand-pumped cartridge with an experienced technician from a reputable company.
Isn't t FlexiSpan and polyurethane better for basements and actively wet areas (basements in snowy and icy weathers) ?
Hi Sam! To be very clear, absolutely not. The best way to fix a foundation crack is through epoxy injection. Polyurethane can also be used in void fill situations, but epoxy is the best solution we have found.
FlexiSpan/FlexiSeal/Waterproofing sprays do not work for basements, no matter what the infomercials say.
What if the cement inside the crack is damp? Still Epoxy?
Yes, you can still use epoxy in those situations. If the crack is actively leaking, it may be best to switch to polyurethane until you get past the leak, as it does react with water.
If it is leaking too bad, it is best to come back another day to complete the repair.
Can I use epoxy for water leaking from concrete slab balcony
It is possible to use epoxy for that, but a concrete sealer for that use is going to be a better solution.
Thank you so much for this video. I literally just had a salesman tell me that I should go with the polyeurathane so that the wall could move in the frost cycle. I wanted epoxy injection because that's what I saw on This Old House. I will continue to look for a proper contractor.
Happy to help, Gina! You definitely want epoxy. Anyone telling you your foundation is moving should be giving you a solution to stop it from moving. Your foundation should also be below the frost line, as is code, to prevent frost movement.
How to oder can you send me the link
Hello! Unfortunately we cannot, but there are companies that do sell DIY kits so you can try it yourself. Some big box stores even carry some.
Thanks!!! Nice to hear a pro.
Happy to help!
Great stuff! Would you still recommend epoxy for cracks in concrete floor please?
Thank you
Hi Toofy! We actually do not recommend epoxy for floor cracks. In order to stop water from entering through the floor, you'll need to install a Drain Tile System.
If all you are worried about is humidity/radon, and not active seepage, you can simply use silicone caulking to seal those cracks.
Thank you very much for the info buddy! Much appreciated! And keep up the great content! Cheers mate
@@toofypeg7931 You bet, thanks for the encouragement!
which epoxy do you recommend??
We use a contractor-grade epoxy only available to contractors. If you are looking to DIY, you can find some kits at the big box stores, but I wouldn't recommend it.
For your foundation, best to go with a reputable company experienced in these repairs that will also provide you with a warranty.