![]() ![]() This process happens, and water doesn’t have much chance to interfere, so it naturally doesn’t contain a high water concentration. Specifically, it happens when the magma underneath the Earth’s surface crystallizes. Since it’s an igneous rock, it must go through a slow crystallization process. When you look at granite, you’ll notice that you can see the grains because they’re large enough to be seen with the naked eye. However, it usually also has trace amounts of amphiboles, mica, and other minerals. Its composition mainly includes feldspar and quartz. As a result, it won’t let much water in, either. Because of how it’s formed, it doesn’t contain water and is dense. It’s created naturally via low-grade regional metamorphism, which means a small temperature increase at a directional pressure. Slate is classified as a metamorphic rock as well. Typically, because of the process it undergoes, it’s a dense rock and can’t absorb much water. These minerals recrystallize under the right conditions and lead to marble formation. This rock mainly consists of micas, clay minerals, pyrite, graphite, iron oxides, and quartz. It occurs when limestone is placed under extreme heat. As a result, there won’t be any water vapor to heat and cause the rock to expand. The slate, granite, and marble are denser rocks, which means they’re less likely to absorb water. The ones that are known for being the safest for the inside of a fire pit, include marble, slate, and granite. Since gravel isn’t the best option for underneath or inside your fire pit, you’ll want to compare your options and find a rock that won’t explode under extreme heat. Additionally, the sand can protect the bottom of your fire pit if you’re using a metal pit. As a result, you can have a fire that’s more evenly heated. In fact, it has benefits, such as the sand will absorb the heat.īecause of how small and close together the sand particles are, they can easily disperse the heat. Fortunately, this practice has no drawbacks. Many people first lay sand, when building a fire pit. Should I Put Sand in the Bottom of My Fire Pit? Basalt rocks don’t always explode, but they can if they contain any water, which is a possibility. The same thing applies when you use sandstone. The vapor causes the pores to expand and then causes the rocks to crack or explode. The water inside of the rock will get hot and cause water vapor. It has various cavities inside of it that can fill with water. Limestone, for instance, is a porous rock. Not to mention, you risk the rocks cracking as well. The rocks used to make gravel are known to explode when they get too hot. You don’t want to use gravel actually in your fire pit. It also depends on how you want to use the gravel for your fire pit. The type you choose depends on your budget and the look you want to achieve. What Kind of Gravel Do You Use for a Fire Pit?Īs a general rule, gravel comprises sandstone, limestone, or basalt. It adds to the appeal of the fire pit and helps prevent fire from escaping when used in that way. Some people choose to place a layer of sand and then rock down underneath their actual fire pit, while others may use the gravel to line the outside of the pit. However, when you place a fire pit, you must know how to build it to prevent a future fire outside of the ring and other issues that could arise if you don’t properly create your fire pit. ![]() The fire pit can also be a place for friends and family to enjoy, as they roast marshmallows or hot dogs. ![]() A fire pit can bring warmth to a cool spring, summer, or fall evening.
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