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Recent content by josh banta
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I am by trade, a masonry contractor. I've built many masonry fireplaces in the past 15 years and always use type S with 1/2 bag of fire clay when building the firebox. We built a firepit for Jim-n-Nicks BBQ that burns 364 days a year. No problems in 9 years.
Fire Clay is added to type S mortar to make it like refractory mortar. Without it the mortar between your firebrick will deteriorate over time. I buy it from my brick supplier. You won't find it in a home improvement store.