Spray Foam Insulates Cantilevered Floors Best

Cantilevered floors, rooms over garages, bump outs and porches are popular in modern day home designs.  While each one can serve a useful purpose, they can present problems with shifting insulation, excessive air flow and moisture vapor exposure.  Cantilevered structures such as bump outs also have a fair amount of window area, leading to convection currents moving air down towards the floor, cooling the floor surface noticeably.  People often complain that while useful and attractive spaces, these overhang areas are usually too cold or too hot.

Spray foam insulation is the perfect solution for these areas as the foam can provide a permanent thermal and vapor barrier which also creates greater heating and cooling efficiency.  Because foam adheres to all surfaces during installation, it eliminates air flow and increases energy efficiency by completely sealing any openings where air can enter.  The result is more comfort for the homeowner and lower energy bills.

The Building America Solution Center of the U.S. Department of Energy actually prescribes the way cantilevered floors should be insulated in order to qualify as an Energy Star Certified Home.  They recommend air sealing the top, bottom and all sides of cavities formed by cantilevered floors.   Insulation must be installed so that there are no voids and must be in full contact of all parts of the cavity.

Because spray foam insulation is in liquid form when it is applied and expands to fill all cracks and voids, it provides a perfect air tight thermal barrier for these kinds of spaces.  Having an attractive, cozy window nook or bay doesn’t provide much living space if it is uncomfortable to use it most of the year.  Use spray foam to turn these architectural features into everyone’s favorite place to be in your home.

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