How deep does a foundation need to be for a garage?

In most areas of the United States, garage footers are usually dug 36 inches below the final grade. The footer size is typically 20 inches wide and 8 inches deep. If your township requires something different, it will be done according to your municipality requirements.

siteprep.com - 7 Garage Foundation Tips You Should Know About - Site Prep

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Building a concrete foundation for your garage plays a crucial role in the lifetime of the garage. A garage foundation is typically made of a concrete block wall and poured concrete. It is the most important key to supporting the structural integrity of the garage. It may look like a lot of extra work, but building the garage on a well-maintained foundation prevents many problems and grants the garage decades of reliable use. Unfortunately, foundation problems are not always easily apparent, especially if you are not intentional about checking them. The best way to avoid future garage foundation problems is to install it right when building the garage! Most homeowners choose to hire site preparation professionals who have seasoned experience and accurate knowledge about foundations, rather than attempting a DIY garage foundation. Here are some useful tips that every garage owner should know before building their garage. The main threat to your garage foundation comes not from what gets built or assembled on top, but comes from what might move below. The soil you build your concrete foundation on needs to be compact and well-maintained to get the best concrete foundation results. If the soil or base beneath the foundation settles or moves, the result can be a gapped or cracked foundation. Good preparation of the building lot starts with removing the topsoil. After that, a trench is dug for pouring reinforced concrete footers. In most areas of the United States, garage footers are usually dug 36 inches below the final grade. The footer size is typically 20 inches wide and 8 inches deep. If your township requires something different, it will be done according to your municipality requirements. When you take the steps to prepare the soil, you limit the risk of settling in the ground causing cracks in your garage foundation.

2. Vapor Barrier For Concrete Foundation

After filling the inside of the foundation with at least 4” of ¾” inch clean stone across the entire foundation, it’s a good idea to add a vapor barrier to prevent condensation on your garage floor. A 6 mil plastic vapor barrier is a typical material.

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Vapor barriers are usually sheets of plastic. It is an inexpensive bit of insurance against water moving up through the porous concrete. It prevents damage to items placed on the garage floor. Garage foundation vapor barriers are manufactured specifically for use under concrete.

3. Choosing The Right Foundation Mixture

The garage foundation should be a minimum of four inches thick when placed on good soil. It may need to be thicker if the garage will be home to unusually heavy equipment. The amount of water used in the foundation mixture is determined by the standards. Although adding more water makes pouring easier, it can also make the foundation weaker. If you live in a cold climate, your concrete mixture should include air-entraining agents, which limit damage to the foundation through seasonal freeze cycles. Typically, when pouring a concrete garage foundation, you will simply order the concrete from a local concrete supplier according to the PSI rating your building drawings require. The concrete company will take care of the exact mixing ratios for the materials.

4. Garage Foundation Reinforcement

Fiber, wire mesh, or thick reinforcement rebar is an important component of concrete foundations. Fiber reinforcement has become popular in recent years as an inexpensive product that matches up well to wire mesh reinforcement in many tests. The fibers are usually mixed in with the concrete to increase structural strength and produce a stronger foundation. Many contractors like Site Prep now add fiber reinforcement to every concrete garage foundation they pour.

5. Expansion Joints

What is a concrete expansion joint? A concrete expansion joint is designed to prevent random cracking by giving a predefined location for a concrete foundation to crack. Expansion joints are normally placed in concrete foundations to prevent expansive cracks formed due to temperature change, ground settlement, and soil movement due to earthquakes. Concrete foundations expand and contract with changes in temperature and moisture. If this expansion is not controlled properly, cracks can begin to appear and may run in any direction, or in multiple directions. For that reason, the expansion joints play an essential role when pouring a concrete foundation. Expansion joints should be at least 25% of the total thickness of the foundation. Expansion joints will be made by sawing into the hardened concrete surface. It is important to understand that the longer sawing is delayed the higher the potential for cracks to establish themselves before sawing is complete. For instance, one inch deep cut would be required for a four inch thick pour. Expansion joints will then be created after the concrete is poured.

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Concrete foundations will perform very well when following the considerations listed above. Secure the success of your next foundation project by taking some time to learn more about concrete foundations.

6. Building A Concrete Foundation On A Hillside

There are several options for building a garage on a hillside, such as digging out and building the garage foundation into the slope or building up one end of the garage foundation. When planning and implementing a garage foundation on a slope, make sure to secure expert advice. This will be invaluable in ensuring that the slope does not pose a risk to your garage or its foundation. Professional advice at the outset can help to prevent possible complications with the overall design of the garage.

7. Finishing Your Concrete Foundation

siteprep.com - 7 Garage Foundation Tips You Should Know About - Site Prep

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