How to measure a board foot

August 7, 2017 Anthony Naimo

Knowing what a board foot is and how it applies to installing insulation could be confusing. You may not know that the measurement of spray foam insulation does not come in feet, meters, or even square feet, but rather in board feet. Board feet are calculated from the square footage of the cavities in the area you want to insulate (for example, a wall). The typical dimensions of a board foot are 12 inches by 12 inches by 1 inch. A board foot is a volume measurement and, therefore, a volume equation is used since the cavity, which has a length, height and depth, is being filled with spray foam. How to measure a board foot is a pretty simple equation. It can be done by length x height x the thickness or R-value you require per cavity (depth).

Knowing how to measure a board foot is useful because not only do you know how large of a space you need to insulate, but also it can give you a rough idea of how much spray foam insulation can cost. Remember, the cost of spray foam insulation based on solely board feet does not consider labor costs for installation by a certified professional. For your home project, take the measurements to get the square footage of the wall cavities, and multiply that number by the thickness/depth. When choosing spray foam insulation for your project, your local Icynene contractor will be able to tell you how much spray foam is needed for your project as well as tell you how many board feet of insulation are required depending on the R-value needed to meet the local building code. Icynene licensed contractors are knowledgeable and are able to help explain the process before any installation starts. Knowing how to measure board feet is not necessarily expected of you as a homeowner, but having an idea how to calculate the board feet can help you roughly price out your home insulation project. 

Talk to a licensed Icynene spray foam insulation contractor in your area to find out how to measure board feet and how much board feet you might need for your home project

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