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DAP 7079818854 High Heat Mortar Fire Stop Caulk, 10 Fl Oz, Black

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1,160 ratings

Amazon's Choice in Fire Barrier Caulk by DAP

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Adhesives & Sealants
Country of manufacture: United States
Manufacturer: Dap
Super tough, high temperature mortar
Sets rock hard when fired
Applies easily
Stops air leaks
Saves energy

› See more product details

Customer ratings by feature

Easy to use

4.5

Warmth

4.4

Easy to clean

4.3

Value for money

4.3

See all reviews

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Customer Rating	(1160)	(222)	(29)	(127)	(3)	(7)
Price	$5.65	$11.63	$6.02	$12.99	$14.99	$8.49
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Product description

Product Description

Silicate Cement, Base Silicate Cement, Size 10.1 oz., Container Type Tube, Color Black, Specific Gravity 1.8, Performance Temp. Range 0 Degrees to 2000 Degrees F, Flash Point Greater Than 200 Degrees F, Application Time 1 hr., Application Temp. Range 40 Degrees to 100 Degrees F, For Use With Standard Caulk Gun, Meets ASTM E136

From the Manufacturer

A non-combustible silicate cement for applications in wood-frame construction where and ASTM E 136 sealant is required. Can also be used for patching and sealing around fireplaces and wood-burning stoves. Withstands temperatures up to 2000 degrees F. Sets rock hard when fired. Easy water clean-up. For interior use only.

Product information

Technical Details

Manufacturer

Dap

Part Number

18854

Item Weight

1.12 pounds

Product Dimensions

11.5 x 2 x 2 inches

Item model number

7079818854

Is Discontinued By Manufacturer

Size

10 Fl Oz

Color

Black

Thickness

1 Inches

Item Package Quantity

Included Components

Unit^Instruction Guide

Batteries Included?

Batteries Required?

Additional Information

ASIN

B0006MXS4C

Customer Reviews

1,160 ratings

4.5 out of 5 stars

Best Sellers Rank

#2,674 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
#1 in Fire Barrier Caulk
#49 in Industrial Sealants

Date First Available

July 3, 2006

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Customer reviews

5 star		73%
4 star		16%
3 star		7%
2 star		2%
1 star		3%

How are ratings calculated?

Top reviews from the United States

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TERRY W MITCHELL

This black mortar turned white when heated.

Reviewed in the United States on July 8, 2019

Verified Purchase

This was purchased to seal around the housing of glass doors for the fireplace. The housing is black and the mortar was black when applied. The mortar turned white and does not match the housing. This is extremely disappointing.

25 people found this helpful

Helpful

The Longs

Works awesome to seal segmented indoor chimney

Reviewed in the United States on April 6, 2019

Verified Purchase

This works fantastic for my purpose. In my basement is a woodstove with one of those god-awful chimneys that has all the segmented sections that let’s air in to create creosote or in the summer if it reverses it let’s smoke smell out. After I took it apart and cleaned it thoroughly I put this stuff on each section as I was putting it back together. Keep a bunch of wet paper towels are wet rags handy as you wipe excess off with your fingers as you go. I’d say in 15 to 20 minutes it was semi hard. Then I just started a fire to fire the material. I have no smoke smell anymore. The draft is stronger to because there’s not air leakage. Over the next few days of having fires the excess that I didn’t quite wipe off or crack and fall to the ground but the stuff in the joints is staying strong. It’s not the prettiest up close but when you’re not standing right next to it you really don’t notice it. it dries to a very dark charcoal gray almost black. If I’ve gone slower I could’ve made it much less messy. It shows up more in the picture than it does in real life. You could definitely paint it with grill paint if you want to do afterwards. A+, five stars, two thumbs up, would play with grey fire smoo again!

9 people found this helpful

Helpful

Dax A. Jones

A bit messy to work with, but it works well!

Reviewed in the United States on November 19, 2015

Verified Purchase

I recently purchased a 37 year old house with a fireplace that was in need of repair. I received a quote to repair the cracks from the provider who cleaned the flue, and it was going to cost around $200. I purchased 2 containers of this DAP mortar and did the repairs myself. I only ended up using 1 container, which went further than I expected. It is pretty much like working with any other tube of caulk. Many of the cracks were fairly narrow, so I only clipped a small amount of the end off, so that I would be able to fill in those narrow cracks. It was fairly messy, though I am not very skilled with apply caulk, so that was to be expected. It dried fairly quickly and I was able to start a low burning fire (i.e. 2 small logs) within 2 hours after applying the mortar. The color of the mortar is black, and as far as I can tell, the color doesn't change. We plan to paint the inside of the fireplace black, so it is not an issue for us, but otherwise, the color might be an issue for some. I've included some before and after pics, showing the cracks before the repair and the black mortar after the repair.

29 people found this helpful

Helpful

MommyofTwo

Gaps between brick and fireplace insert (smoke damage)

Reviewed in the United States on January 29, 2021

Verified Purchase

The insert we had was not sealed correctly when we bought the house. We started noticing smoke damage from around the sides where the brick wasn't sealed to the fireplace insert and created gaps. I did tons of research and even went to all the big box hardware stores to no avail. Apparently I was the only person who had ever experienced this because nobody was able to recommend a solution. I took a risk and found this in combination with MEECO'S RED DEVIL 1105 Fireplace Insert Insulation. We burn HOT fires and I needed something that would resist catching fire or melting with the hot fires. While this isn't "rated" for more than a few hundred degrees Fahrenheit, I took a chance. I used it to seal from the inside of the fireplace along all the seams and edges. It was messy, and required two applications. The first adhered fine, but shrinks so I had to do another seam to truly seal all the little gaps. We burn our fires once again and (upwards of 500 degrees) and it is holding strong, no more smoke damage to my brick anymore. Fresh coat of pain on the brick!

One person found this helpful

Helpful

Works but not black after heating and has white flakes!

Reviewed in the United States on January 10, 2021

Verified Purchase

Updated: after putting many layers of black paint over the grey, it's still grey and still has white flakes! Somehow the paste rejected my paint, I didn't even know that can happen.

Original:
It's easy to work with and works as it states. However, the paste is black but it turns dark grey after heating. I had to repaint it black to match the rest of the black surface. Also, there are white 'flakes' as other reviews mentioned but only along the edges of the mortar (see pic)...weird.

One person found this helpful

Helpful

freak3dot

Turned gray after about a week.

Reviewed in the United States on January 3, 2020

Verified Purchase

I bought this to fix a crack in black mortar. The wood burning fireplace in my living room had settled over time. I used this product because it was black and rated for use near a fire. Unfortunately, it turned gray. Now my fixes look terrible. That might be OK if you are repairing gray mortar, but that wasn't my use case.

3 people found this helpful

Helpful

GaryS

Sealed Gas Pipe Entering Fireplace

Reviewed in the United States on December 28, 2015

Verified Purchase

My Heatilator fireplace was originally set up for natural gas or wood since it was properly vented with a full chimney. However, the gas pipe entering the fireplace had too much of a gap around it, so it needed to be sealed to prevent sparks from leaving the firewall and reaching potential combustibles in the building.

DAP's product was very easy to use with a caulking gun, pumping the product into the small, open area to be sealed. Easily shaped and smoothed to provide a professional appearance. It dried to the touch quickly.

I used a hairdryer right away to provide heat to harden, then lit a fire to cure the product. Now it seems hard as a rock with minimal shrinkage. A great way to seal areas of concern in fire boxes and chimneys.

8 people found this helpful

Helpful

Brad

It was a good recommendation because the fireplace was older and needed gaps ...

Reviewed in the United States on September 24, 2015

Verified Purchase

Bought this on the recommendation by Amazon when I purchased a Fireplace glass insert screen. It was a good recommendation because the fireplace was older and needed gaps filled in where the brick had separated in the fireplace, Also this is great to fill in where the mortar came out between the bricks in the fireplace. I originally bought one tube of this but ended buying a second one later due to the fireplace needing more gaps filled in than I originally thought. After I applied two tubes of this I painted the inside of the fireplace with black fire rated spray paint to hide all my caulking. If you use spray paint in your fireplace make sure it is fire rated.

9 people found this helpful

Helpful

Top reviews from other countries

scubaphil

Worked well

Reviewed in Canada on February 17, 2018

Verified Purchase

Worked well for what I wanted. I needed to seal between the bottom metal edge of my fireplace grate and the irregular surface of the stone hearth. I was expecting that it would be firmer out of the tube and hold its shape better. I needed to tape off what I needed and let the product dry, which it did quickly. It has hardened now and fills my gaps very well.

timbo

A bit messy to use, but it works well

Reviewed in Canada on March 19, 2013

Verified Purchase

Used this to repair some minor cracks and a few small broken areas of mortar in my fireplaces. It is a bit sticky, sometimes preferring to stick to the tube and to fingers rather than to the mortar, thus it was a bit more difficult to apply than I had expected. However, overall it has stayed solidly in place after several fires in the fireplace, and it looks good.

SailorSam

Two Stars

Reviewed in Canada on January 11, 2018

Verified Purchase

Followed the instructions perfectly but the seal gave away just after two days.

Amazon Customer

Five Stars

Reviewed in Canada on June 20, 2015

Verified Purchase

Worked great for me.