A concrete block BBQ fireplace is a beautiful addition to your backyard. However, it’s not uncommon to observe cracks over time, which aren’t necessarily synonymous with danger. Welcome to the wonderful world of refractory concrete blocks. 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. That’s why it’s the number 1 choice for outdoor fireplaces, guaranteeing high strength and excellent stability in the face of Quebec’s climatic conditions. However, despite its strength, refractory concrete remains sensitive to sudden temperature changes.
Thermal shock: the role of oils and gas
One of the main factors in crack formation is thermal shock, which occurs when concrete blocks are exposed to rapid temperature variation. For example, adding oil to accelerate cooking, or gas to intensify the fire, can create a rapid increase in heat, risking the formation of micro-cracks. These micro-cracks appear because concrete expands rapidly under intense heat, then contracts as it cools. Although these cracks are often superficial, they can become more serious if moisture subsequently infiltrates them.
Never use water to extinguish a fire
It’s tempting to put out a fire by pouring water, but this method is not recommended for a concrete fireplace. Water poured over heated blocks cools rapidly and abruptly, creating a thermal shock that can lead to cracking. To extinguish the fire safely, let it burn itself out. This will prevent damage caused by sudden cooling of the blocks.
The effects of winter frost
Cracks, even small ones, 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 lead to further fractures, or even block bursts.
Protecting and maintaining your BBQ fireplace to avoid cracks
To get the most out of your BBQ fireplace, a few maintenance and protection measures are essential. Here are a few simple recommendations to keep your fireplace in top condition year after year:
Avoid thermal shock
Never pour oil, gas or other flammable fuels into the fireplace to intensify the flames, and don’t pour water over heated blocks to extinguish the fire.
Protect your BBQ fireplace in winter, but not too early
Covering your fireplace during the cold season is an excellent idea to protect it from snow and damp. However, wait until the temperature has stabilized before covering it. If you cover it too early, day-night temperature variations can cause condensation under the cover, which could be even more damaging to the blocks. To avoid this type of condensation, opt for a breathable cover that allows moisture to escape.
Warranty and peace of mind
To reassure its customers, Patio Drummond offers a one-year warranty on its BBQ fireplace blocks. This warranty covers any manufacturing defect and offers you the possibility of replacing the blocks in the event of a major problem. If you have any questions or concerns about the condition of your fireplace, please do not hesitate to contact your local dealer for more information. They will be able to advise you on best maintenance practices and guide you through any necessary intervention. They’ll be able to advise you on best maintenance practices and guide you through any necessary interventions.
Want to learn more about how to increase the durability of your fireplace? Read our article right here!