I know it might sound cliché, but I believe that the foundation of a new home is the cornerstone to a project's success. The reasons for this are fairly straightforward - I've seen projects where a foundation is poured incorrectly and cracks form in the cement over time, which opens up places where air can escape and enter. Since I intend to make my building envelope as tight as possible to control the conditions inside of my home, it’s important that the foundation is solid and well-poured.
One other misconception about foundations that many people don’t think about is the porous nature of foundation concrete. It’s easy to be misled into thinking that because concrete is as solid as rock that it will keep the outside air out of your basement, but actually the opposite is true. Concrete is one of the most porous materials there is when it comes to air and water infiltration.
That’s why after my foundation was poured, I immediately set to work insulating it with two inches of rigid insulation on the inside, and two inches of XPS rigid insulation on the outside along with waterproofing and cement board. If I want to build a home with a low R value I know that insulating the basement walls is key to creating the energy efficient, comfortable space that my family and I can enjoy.
Like other elements of my project, I like to know what I'm getting into and develop a plan even before the shovels hit the ground. If you’ve built a home or poured a foundation before, what considerations matter to you when it comes to this critical project element? Join the conversation and let us know.