Concrete gap sealant

[JHZR2]

I've been interested in sealants lately.

These gaps are too wide to seal without backer rod, yet I'm pretty sure there is none used. It is some kind of caulking g sealant for concrete that stays permanently flexible and can be worked smooth.

Is it a polyurethane product? It seems rubbery.

I see stuff like this in use all over but no idea what it is.

I need to do a wide gap between wood and concrete on my garage, and this stuff would work great I think...

 

[abycat]

that just looks like your run of the mill outdoor white polyurethane. You might want to run to your local rona and take a look what they have. When i was young i worked in the paint department there and they had hundreds of choices. I cant say what that is for sure but im sure they will have a couple choices. Some workers even have pretty decent knowledge about thei products as well.

oops for some reason i thought you were in canada. Forget the rona and try your local building supply shop for some visual stimuli.

 

[JHZR2]

So polyurethane stays permanently flexible? I've never worked with the stuff - silicone has been what I typically use.

 

[stockrex]

urathane base caulk stays SOFT way way longer than anything I have seen,
I have it around my front door which is west facing and 6yrs and still soft as day 1.

prep is important for good adhesion,

 

[sleddriver]

I've been using Sonneborn NP1 on my home roofing project and am quite impressed with it. It cures by moisture, not evaporation. When it cures it remains flexible, but sticks tenaciously. I plan on using it on some limestone/wood joints around the exterior. There's another product called Big Stretch that I also hear good things about.

 

[JHZR2]

Originally Posted By: sleddriver
I've been using Sonneborn NP1 on my home roofing project and am quite impressed with it. It cures by moisture, not evaporation. When it cures it remains flexible, but sticks tenaciously. I plan on using it on some limestone/wood joints around the exterior. There's another product called Big Stretch that I also hear good things about.


http://www.dowcorning.com/content/publishedlit/63-1015-01.pdf

Found that interesting. Where are you buying sonneborn? He'd seems to only sell it online.

 

[sleddriver]

"He'd seems to only sell it online." I don't understand this. Please elaborate.

Not sure if the box stores carry NP1. I buy it at a local HW store or a sheet metal supplier where I purchased the metal trim/flashing for my roof.

 

[JHZR2]

Lol, spellcheck. Supposed to be HD.

 

[doitmyself]

According to the Dow link, their product appears to surpass all of the popular urethane products.

I would like someone to explain the relevance of the characteristics in the table. Just like oil and grease specs., one needs to know if the numbers are significant.

A few things in the Dow table raises red flags for me. When compared to the Sonolastic® NP 1 tech sheet, I found 2 differences.

http://www.basf-cc.co.nz/en/products/Joi...tic_NP1_TDS.pdf

Dow claims polyurethanes must be applied 1:1 (width:depth) vs. their 2;1. Yet, both the NP1 and Sika PDS' state they too, are applied 2:1 (less material used).

Dow states the NP1 movement capability at +/- 25% while the NP1 tech. sheet states +/-35%.

In Dow's Adhesion column, they use the word "claims" in the competitor's description (inferring doubt).


Do you see where I am going with this? The DOW product might be superior, but do we have the expertise to understand the numbers?

And, as I have shown above, DOW seems to have skewed the data to their benefit. I would like to hear from an expert that might define the data AND maybe point our if the DOW product might have some cons.

 

[JHZR2]

Totally agree. Just found that while searching to find sources of the NP1. I dont have a dog in the fight.

 

[sleddriver]

HD..got it. I remembered that both ABC roofing supply & Bradco distributers also carry it. These are national, perhaps there's one in your area? Also check other roofing suppliers. ABC carries a lot of sealants & adhesives used by the trades you won't find in the box stores.

 

[strongt]

That could be a Sikaflex Polyurethane Elastomeric Sealant product. We've used alot of that in commercial constuction. For sealing between steel door jabs or metal window frames where they meet with concrete or masonary. They also make a two part system for pressure caulking guns for sealing control joints in concrete tilt-up buildings. But in those joints you use a backing rod.

 

[JHZR2]

Do you know which sikaflex is the best to use? I saw a bunch called that in HD today.

I also have a tube of OSI quad though I don't know what it's dried consistency is. I may tube some out just as an experiment.