Having a concrete block BBQ pit is a truly beautiful addition to your backyard. However, it's not uncommon to see cracks appear over time, which aren't necessarily a sign of danger. Welcome to the wonderful world of refractory concrete blocks.
What is refractory concrete?
Refractory concrete is specially designed to withstand the high temperatures generated by a fire. Unlike ordinary concrete, refractory concrete can withstand high temperatures without deforming or disintegrating. This is why it is the number one choice for outdoor fireplaces; it guarantees high resistance and excellent stability in the face of Quebec's climate. However, despite its resistance, refractory concrete remains sensitive to sudden temperature changes.
Thermal shocks: the role of oils and gas
One of the main causes of cracking is thermal shock, which occurs when concrete blocks are exposed to a rapid temperature change. For example, adding oil to speed up cooking or gas to intensify a fire can create a rapid increase in heat, potentially causing microcracks. These microcracks appear because the concrete expands rapidly under intense heat and then contracts as it cools. Although these cracks are often superficial, they can worsen if moisture subsequently penetrates them.
Never use water to extinguish a fire
It's tempting to extinguish a fire by pouring water on it, but this method is not recommended for a concrete fireplace. Pouring water onto heated blocks causes rapid and sudden cooling, creating thermal shock that can lead to cracks. To extinguish the fire safely, let it burn itself out. This will prevent damage that could result from the sudden cooling of the blocks.
The effects of frost in winter
Even minor cracks are not a problem in themselves. However, they can become problematic if water seeps into them. In winter, water that penetrates cracks and freezes creates internal pressure as it expands, which can cause larger cracks or even block collapses.
Protect and maintain your BBQ fire pit to prevent cracks
To get the most out of your BBQ grill, a few maintenance and protection steps are necessary. Here are some simple recommendations to keep your grill in excellent condition year after year:
Avoid thermal shock
Never pour oil, gas, or other flammable fuels into the firebox to intensify the flames, and do not pour water on heated blocks to extinguish the fire.
Protect your BBQ area in winter, but not too early
Covering your fireplace during the cold season is an excellent way to protect it from snow and moisture. However, wait until the temperature has stabilized before covering it. If you cover it too early, the day-night temperature fluctuations can cause condensation underneath, which could be even more damaging to the bricks. Opt for a breathable cover that allows moisture to escape to prevent this type of condensation.
Guarantee and peace of mind
To reassure its customers, Patio Drummond offers a one-year warranty on its BBQ fire pit blocks. This warranty covers any manufacturing defects and allows you to replace the blocks in case of a major problem. If you have any questions or concerns about the condition of your fire pit, please contact your local retailer for more information. They will be able to advise you on best maintenance practices and guide you through any necessary repairs. Want to learn more about how to increase the lifespan of your fire pit? Check out our article right here !
