Mat or raft foundations are used where there are poor ground conditions, such as soil that is unable to bear any loads. Reinforcing the concrete with rebar costs an additional $1 to $2 per square foot. The cost to build a 1,350-square-foot raft foundation is about $10,100. Raft foundations cost $5 to $10 per square foot. Stem walls add stability to homes and buildings in areas where earthquakes may happen, or soil may become unstable. The slab can be elevated to accommodate septic systems based on gravity flow. The average cost to build a 1,350-square-foot stem wall foundation is $7,600.Ī stem wall foundation works well when building on a slope, as different sections can be built to different heights. A two-way beam supports all four foundation edges at the same time, providing a more stable base.Ī stem wall foundation costs $50 per linear foot installed, or $7,000 to $20,000 total. Monolithic two-way beams cost about $13.52 per square foot. A one-way beam supports the foundation on two edges. This type of foundation pours the beams (or footers) at the same time as the slab. Monolithic one-way beams cost $9.80 per square foot on average. Remember proper planning at the beginning of your project will save you from future headaches and costly repairs.Monolithic slab foundation poured above the ground When it comes to planning, choose a qualified engineer with experience in foundation design.Ĭlick here to contact Wafflemat's in-house engineers. ![]() The Wafflemat foundation is a great choice because it offers an incredible stiffness rating compared to traditional slabs and is designed specifically to resist differential movement from expansive soils.įoundation stiffness ratings can be confusing, but if you're having issues with your foundation, there's a good chance it's a result of low stiffness.Īlways make sure your builder is using stiffer materials that are rated to deliver value for your home for many years to come. Wafflemat even won the Clean Air Award in Green Building after a study was released stating that using the Wafflemat System helps reduce CO2 emissions. Installing these forms keep consumption of materials low as there is less concrete, water, and steele required than a traditional foundation. The Wafflemat foundation system is made from recycled plastic forms called Waffleboxes. However, unless it is designed with void forms like the Wafflemat System, this type of foundation can lead to problems with moisture and ground movement. Slab-on-grade (sometimes called "spread footings")Ī slab-on-grade foundation can be as simple as an 8" thick concrete pad poured directly on top of the soil below.The most common types of foundations are: ![]() Wafflemat is the designed with void forms that accommodate for expansive soils, which means that it is able to resist differential movement between the soil and the structure.įoundation stiffness ratings are different for different types of foundations. If you are building a new home and you have a choice of your foundation type, you should choose a Wafflemat Foundation. The higher the plasticity of the soil, the more likely your home will suffer from problems like cracking and shifting. However, to avoid costly repairs, it is important to get the right kind of foundation in the first place.įoundation stiffness ratings are particularly important on properties on expansive soils that experience differential movement. Once you determine that you have a problem with your home's foundation, it's time to hire an expert inspector who can come out and do a thorough investigation. You can check if there are any signs of foundational problems by looking for cracks in walls or ceilings close to where walls meet the ceiling checking for uneven floors and walking around your house listening for creaking sounds. A weak foundation will result in cracks in walls and ceilings, sagging floors and other problems that may lead to structural damage over time. The primary purpose of a foundation is to support your house from the ground up, so the strength and durability of any home depends on its foundation.
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