TAMOSEAL is a cement-based waterproofing treatment that makes a great chimney crown coat. I have been using this product for 15 years plus, and it has made me a lot of money and has handled lots of my customers’ chimney crown leaks. The product comes in a 50lb bag and requires a bonding agent, AKKRO-7T be mixed with it. The bonding agent comes in a 1-gallon container.
Other uses for Tamoseal
Now this much product will coat a LOT of square footage. Consider that not only is it good for preserving a chimney crown, but it will also waterproof the following:
- Concrete block
- Precast concrete
- Formed concrete
- Below grade surfaces subject to water penetration
- Brick and stone.
A critical point to know when mixing this chimney crown coat is that it has to be mechanically mixed. I use a paint mixer and a cordless drill. The cordless drill allows you to control the mixing speed. If using an electric drill, you will want a variable-speed drill on a low setting to start with. If your drill is too fast it will make a mess of the mixing procedure. You can get a paint mixer for your drill at Home Depot or just about any hardware store or paint store.
Another critical point is that in order to properly coat a crown with Tamoseal you must apply two coats. You apply the first coat, let it dry, then apply a second coat. This product does a very nice job as you can see in the photos below:
If you have some compelling reason to have to do this repair with rain in the forcast, then apply the first coat and then tarp over the chimney to protect it (don’t tarp over the chimney if it has a furnace or other appliance venting out of it- wait for a dry day instead). Do the same for the second coat (if there is still a threat of rain.)
The final coat should be brushed on with the brush marks all going in the same direction as much as possible. This makes for an even texture and finish.
Do not apply the product if the temperature will be below 40 degrees F (4C) or if it will fall below 40 degrees in 24 hours. If there are going to be hot and/or windy conditions, you will have to lightly spray the finished surface several times throughout the day to prevent rapid curing. Wait 12 to 24 hours before applying the second coat.
Cleaning up after applying the product
It is almost impossible not to smear some of the product onto the first layer of brick that the chimney crown was poured on. The way that I deal with this is to let the product stiffen up somewhat and then use a chisel, putty knife or some similar edged tool to scrape the product off of the brick. follow this with a damp sponge or towel. Thouroughly rinse out paint brushes, sponges, etc. Don’t forget to rinse off your paint mixer drill attachment as well. DO NOT LET THE PRODUCT DRY ON YOUR ROOF. If you get any on the roof, rinse it off as soon as you can. It is difficult to remove it from composition roofing shingles once it has dried.
What do I do with all of this left-over product?
The Tamoseal powder has a shelf life of 18 months in the original, unopened package. The shelf life decreases drastically if you let it get wet! Do not store it in a humid area if at all possible. Having said that, If you have no other uses for the product you may have a friend or neighbor that could use it. You could donate it to Habitat For Humanity or some other local organization.
The ideal conditions for application
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