How to repair leaks permanently on flat roofs Karnak 19 Professional Grade Flashing Cement
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- Roof repair with the industry's No. 1 choice of flashing cement - Karnak 19. The video demonstrates the surface preparation and application of Karnak 19 on a roof surface. and provides technical product information, valuable to building owners, managers and roofing professionals alike.
19 Flashing Cement
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Man if I did a patch on the roof that looked like this my boss would throw me off and fire me before I hit the ground.
Lol
Agree boyo. i can't believe it.
I think it was just a quick video showcasing the way to use their product.
Of course, if I were to DIY this, I'll try to make the patch work more neat and squared off instead of circular and left with tiny ledges. It'll be smooth. However, who is going to see this on a rooftop?
Sorry to hear that! You need a nicer boss.
I like this product ,i personally use a brush i cut the bristles to stiffen it up and then apply . I make sure its square to look visually pleasing to our customers looks great after finishing with granuals .
Snap bro, I like to make it square, just looks messy daubed on like that. ?
Great advice!
I just scrubbed a whole bunch of this stuff off my arms the other day. Looked up this video so I could show my friends why I'm so dirty
Yes! It can be hard to get off your skin, but if you use our product called KarnaKlean, you will have it off in no time.
WHOA! So you're saying I can do this myself, and not take forever doing it? SOLD!!!!
Absolutely, give us a call at 800 526 4236, or depending on where you are in the country you can get it at some big box retail hardware stores.
LOL over 9 gallons of that stuff on-hand for that little tear!!
;-)
Always good to have this in the back of your truck for quick repairs.
I'm upset you didn't make it look nice
Sorry!
Can I use this to cover the whole flat roof? I'm not sure where the leak is happening on the house. I'm thinking about caking it with this if it works...
Did you do the whole roof what was your results?
Yes, we are curious too how your job turned out. You would use this typically for spot repairs, and then coat the whole roof for best results.
Can you use this multiple times after you open the container? How long does it take for it to harden?
Depending on how tightly the 19 pail is resealed and storage, i.e., inside in a 40 to 80 degree space apposed to outside in the back of a contractors repair truck, it can be several weeks to possibly months if not longer to harden in the pail.
Depending on the KARNAK Asphalt Flashing Cement used, KARNAK Flashing Cement's such as #19 Flashing Cement, #19 Ultra Rubberized Flashing Cement and #155 Amphibikote (Wet/Dry) when applied will create a waterproofing asphalt layer and the material will skin-over within a few +/- hours. Depending on the ambient temperature, this skinning over time frame may be longer or shorter, i.e., (warmer temperatures will quicken the skinning over process).
When flashing cement cures it will continue to have a "putty-like" consistency. This is the nature of roofing asphalt and is advantageous because it allows the repair sealant to expand and contract with the roof substrate." The curing process will continue depending on the thickness of the applied material and may take several weeks or longer. This process, as well, depending on the ambient temperature, may be longer or shorter.
Once applied, either the KARNAK #19 or #19 Ultra or #155 will perform as designed throughout the "Skinning Over"/"Curing" process. Depending on the application, expansion/contraction movement and nature of repair, the flashing cement can perform for upward of several years or longer. This time frame can vary either longer or shorter.
@@KARNAKroofcoatings Thank you!
Thats was better, try using the tip of the trowel to make that tar job look nicer. It should look oval and uniform when complete. Alsi the way the tar built up on your trowel is kind of embarrassing and a good tar man never wears a glove.because thats how it gets on the handle.
Thanks for the advice!
@@KARNAKroofcoatings cheers!
This is Bitumen? I se 2 same product you use Bitumen but The labels, are different? What is the difference between the 2?
Yes, it is asphalt. You may be referring to our 19 vs our 19 Ultra. Two different products in our line, both of which contain asphalt/bitumen.
It is about 54 degrees in seattle. It was very difficult to apply and it didn't want to stick to the torchdown. I put a very thick patch and was able to get it down. Then when I put on the fiberglass it was sticking. I hope this works.
how did it hold up?
Thats exactly what you should have done!
No no. I would have use the round tip trial.Feather edge into a perfect circle
That's another option!
I did a patch like this on my camper, using a similar product and some mosquito screen. It was supposed to be a fix until next spring, but it's holding up well for now.
Glad it worked!
Over kill for such a small area.
This is a demonstration, but is the right amount of material for this area.
mesh tape and cement every seam. let cure. then i would use your silver coat product on everything, 3 coats. should buy you a lot of time and retard the UV degradation
This is basically a tar coating right?
Yes, it is asphalt-based - not coal tar pitch.
I need to show this video to my building management because this is like the 7th to 10th time the roof broke. 😡😡😡
Yes, this product will definitely help with that!
Using this product now!
Glad to hear it!
The repair looks ugly buddy
Your mom
you did not mentioned that there is winter and summer grade of karnak 19
There is!
That was an ugly repair... How about squaring it up and making it symmetrical and visually appealing at a minimum.
Agree with you.
It is on a rooftop, it serves no purpose being visually appealing.
Ronald has obviously never done this repair. Squared edges are if anything a detriment. Three demerits for him. On a nice summer day it's upwards of 130 degrees up there. YOU hang out and make it pretty!
Your mom
Warning this crap is messy, tar.
Warning even after it's "cured" it will be soft messy tar and can still make a mess even after wards.
Yes, be sure to have Karnak 709 KarnaKlean on hand
Outstanding
Thanks!
Why no silver coating on the roof?
You can put a silver coating on top of this repair. Before applying any coating, you must first address repair/leak locations.
Torch a piece of modified
Can always use modified!
Torch a piece of modified
Can always use modified!
Permanently as in a month or so?
Repairs like this outlast the roof in many cases.
I cannot find Karnak 81 for bitumen. Will Karnak 18 do the same?
No, you would want to use Karnak 66 as an alternate for Karnak 81.
Hi
What is the best cement's brand that we can use to repair a concrete roof, please??????
Karnak of course!
can you apply the reflective coating after applying this?
Keith Lau Yes, you can apply the reflective coating after applying this. (we make both Aluminum (silver) and Acrylic (white) reflective coatings). However, if you use this product, you will need to wait until it fully cures (about 30 days) before applying the reflective coating over top. If you use our 19 Ultra (a rubberized wet/dry flashing cement, shown in another video from our channel), you can apply a coating on top just a few days after making the crack repair. For more information, feel free to call our Technical Dept. at 800.526.4236.
How large of a gap does Karnak 19 fill? I have approximately a 3/4" gap around a roof hatch that needs to be sealed. Would I need something additionally or just Karnak 19 would be sufficient?
Karnak 19 (or any similar cement) will effectively fill gaps up to 1/16". To fill your 3/4" gap, first install "backer rod" (link below) until you get the gap to 1/16". The backer rod will serve to keep the cement in place while it dries, not allowing it to fall into the crack and render your repair ineffective. Once the backer rod is installed, you will use Karnak 19 to seal the gap fully.
www.wisegeek.org/what-is-a-backer-rod.htm
Do you have a product that I can apply to seal the entire roof as opposed to spot patching with Karnak 19?
The short answer to your question is no. No product exists that will fix leaks via a roll-on coating.
Leaks must be fixed with a mastic or flashing cement (like this Karnak 19, among other Karnak products). However, a reflective coating (white acrylic or aluminum) should be applied to cover the entire roof after you have spot patched. This will stabilize the temperature of the roof reducing thermal shock, maintaining temperature inside the building, and making the spot repairs last much longer.
For a more thorough explanation and answers to any questions you may have, please call our Technical Department at 800.526.4236.
I just put it down on some cracks on my concrete roof How long it takes to dry out?
Depending on the KARNAK Asphalt Flashing Cement used, KARNAK Flashing Cement's such as #19 Flashing Cement, #19 Ultra Rubberized Flashing Cement and #155 Amphibikote (Wet/Dry) when applied will create a waterproofing asphalt layer and the material will skin-over within a few +/- hours. Depending on the ambient temperature, this skinning over time frame may be longer or shorter, i.e., (warmer temperatures will quicken the skinning over process).
When flashing cement cures it will continue to have a "putty-like" consistency. This is the nature of roofing asphalt and is advantageous because it allows the repair sealant to expand and contract with the roof substrate." The curing process will continue depending on the thickness of the applied material and may take several weeks or longer. This process, as well, depending on the ambient temperature, may be longer or shorter.
Once applied, either the KARNAK #19 or #19 Ultra or #155 will perform as designed throughout the "Skinning Over"/"Curing" process. Depending on the application, expansion/contraction movement and nature of repair, the flashing cement can perform for upward of several years or longer. This time frame can vary either longer or shorter.
That's a lot of info, but I hope it helps!
This was very helpful thanks
Glad you found it helpful!
how long it take to dry ?
All of our asphalt-based repair products will skin over in 24 hours. However, once 19 is applied to the clean and dry surface, it could rain within a minute and will not wash away.
our roof is a plastic type, a deli that was originally mobile, it has a large fan for the range/Grill for the deli, it leaks no matter what, used a waterproof silicone but nothing simple seems to work, will this flashing be good on that roof?
plastic type?? fyi- oven exhausts are a notorious problem and usually handled completely with metal work. Grease causes many problems, and the heat and cooling of the system creates movement which cracks seems
Karnak 19 Flashing Cement should do the trick!
Gallo Karnak guys, several attempt I made to contact you by mail. One question please do i have customer service dept?. I think so no. If you must reply to customer wish use your system. Let me know how this product available in India and how.
Hi Mr. Kumar: Regrettably we do not have distribution in India at t his time.
@@KARNAKroofcoatings ok. Thanks . But international shipping is possible. If so what will be the price?. On the other hand what about through the online website like Amazon.in or ebay.in
we used to call that stuff Black Jack.
Is that because it lasts over 21x longer than any competitor's product?
Black Jack is a different brand
silly question but my kitchen roof is tiles(not the flat kind) can I just put this over and around the leaking area?
I know it's 5 years late but PLEASE NO, DON'T DO THAT
This would not be an approved application for this product!
Can this be used on a rubber roof with silver coating on it?
Yes that’s TORCHDOWN aka asphalt modified bitumen with aluminum coating
Yes the Karnak can be used on it
In the case that it is an EPDM roof, this product cannot be used on that roof substrate with a silver coating on it. In the case that it is a torch-down APP or SBS, then yes, this product can be used in that case.
sissy i never seen anyone wear safety classess for three courseing
lol
Better safe than sorry!
Way too thick
Thicc
this may be a dumb question but why build a flat roof that can hold water ? why not angle the roof so water runs off I see with a flat roof you can save room by putting all the a c stuff on the roof
Clinton Wurzbach If it holds water it's not properly done, no roof should be completely flat. Even what they call flat roofs should have a slight angle/grade to them to direct water to the nearest drain system
No roof is designed flat. your real question involves roofs to large to have a "single plane" slope. For example a one acre roof with a 3" (lowest slope) needs 53 feet of height added to the high side, and watch out for wind issues. So the method used is to pyramid shape the insulation between the drains. Fire Marshals and codes set the drain distances. Insulation is set in 2" lifts. Imagine a flat table, then add a pyramid shaped foam, and a sheet of plastic
Sometimes the flat roof wears unevenly, creating areas prone to ponding. Proper draining is key to keeping your roof dry, you are right about that.
All roofs have some slope, ponding water usually occurs due to damage done to the existing roof or areas of high traffic!
Is the reinforcement fabric neccesery or optional ?
Can I just get away using the tar in the can ??
Yes you'll definitely need fabric our it won't last as long.
fabric is for movement, non moving repairs as accidental penetration could be without fabric, but fabric is the default method
It is not necessary perse, but making a three-course repair makes the last longer and much stronger.
Very instructive
We aim to please!
Way to much crap on that
Not enough crap sometimes!
What is the purpose of the tape?
It stops the tar from cracking
movement, this method is used on seams which move. It also creates a redundancy which is well worth the cheap fabric he used, there are better fabrics
It makes the repair over 4 times stronger
It makes the repair much stronger and last longer
is that product available in KSA?
Kosrae?
You can check our Store Locator on our website to see where we sell.
Lol no roofer dresses like that for cold tar cement. Slap some dope on it and move on.
Get over yourself.
We always want to look good for our greatest fans! Thanks for your support Jonny Danger
@@KARNAKroofcoatings the suppliers like ABC supply need to stop pushing off winter grade in the summer and Vice versa. Theyre just unloading inventory and know exactly how they’re screwing the roofer.
What do you mean by”pushing off winter grade”
I've had 3 roofers take my money over 8 years: The first one who put on the original, the second, (after the first one bailed on me), came back after the first few rains showed he really didn't fix the leaks and bailed on me, the third, actually did a good job and I called him back to fix another area, and after numerous calls and even 2 visits to the office never called me back and now his work is failing. I'm a little gun shy about handing over a few more thousand dollars to anybody else. Water ponds about 3/8" deep behind my scuppers. Will this product control standing water? Can it be built up to stop the ponding?
Brent Townsend most likely you'll just move the puddle farther away from the suppers using mastic to fill low spots ,1st off standing water isn't a bad thing unless it doesn't evaporate within 24 hours ,if that's the case then leave it alone ,the only way to know if you can move water to the supper by filling low spots with mastic is to stretch out a line from the supper to the high spot ,then see if the line has an equal gap under it ,flows backwards or lays flat on the roof ,if the line lays flat then you can prolly fill the low spot with half the thickness you think it needs and inspect after another rain.
standing water is an install flaw, you need address what happened in the install. Probably needs insulation modification under roof membrane
It will not control standing water, but it will stop the leak in an emergency capacity.
Please let me know the product available in india
And on line availability in india
Our products are not currently available in India, apologies!
Our products are not currently available in India, apologies!
This particular built up roof needs a re-surfacing contract with a UV protector, not a gum repair.
This is a leak repair, not a whole solution for coating. Once repaired, you could coat on top of the repair.
No primer
No need, just clean the roof well first.
No primer
No need, just clean the roof well first.
Thank you 😊
Thanks for commeting!