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- While standard mortar consists of sand, lime, and Portland cement, it’s not suitable for fireplaces due to its inability to withstand high temperatures. Instead, you should use a refractory mortar made of magnesium silicate, which can endure temperatures up to 2,000 degrees Fahrenheit.
www.thisoldhouse.com/fireplaces/21017489/how-to-repoint-a-brick-fireplace
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Can you use masonry mortar on a fireplace?
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Can you use refractory mortar on a fireplace?
Dec 7, 2023 · Yes, it is crucial to use the right kind of mortar in a fireplace to ensure safety and longevity. Using the wrong type of mortar can lead to cracks, deterioration, and even potential fire hazards.
Sep 25, 2022 · Learn an easy DIY method for filling small gaps and cracks in masonry mortar between the fire bricks in your fireplace using refractory caulk.
- Bob Formisano
Dec 21, 2010 · If you are working on the bricks or hearth of your fireplace, you will have the need to mix fireplace mortar. Fireplace mortar is mixed a bit differently than regular mortar. Step 1 - Mix the Mortar. One of the most important parts of mixing fireplace mortar is to purchase the correct type of mortar.
Nov 3, 2023 · Regular cement or masonry mortar will fail once exposed to fireplace heat. Always use mortar specifically rated for high temperature fireplace use. This provides flexibility and heat insulation.
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Jan 26, 2024 · By carefully considering firebrick placement, mortar joint thickness, insulation material, and smoke chamber design, you can construct a firebox that is not only safe and efficient but also aesthetically pleasing.
Mar 6, 2023 · Portland cement or masonry cement blended with lime can be used for brick and stone masonry including fireplaces; hydrated lime mixed with aggregates creates a stronger finish that stands up particularly well against warping caused by weather; air entrained and waterproof types are ideal for areas prone to heavy weather or moisture infiltration ...
Sep 5, 2024 · Instead, you should use a refractory mortar made of magnesium silicate, which can endure temperatures up to 2,000 degrees Fahrenheit. This specialized mortar is designed to expand and contract with the brickwork as it heats and cools, ensuring a longer-lasting repair.
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