R-10 Insulation Board vs. Spray Insulation

Application

• Because of the nature of the insulation, each of the two types is applied in differing ways. For spray-on insulation, the foamy material is sprayed from a machine that can be rented at many home improvement centers or hardware stores, and is typically sprayed over the floors of crawlspaces or between walls. Alternately, slab insulation is applied flush to the slab and footing of a home’s foundation in large sheets or boards.

Cost

• The cost difference between the insulation types is great: typically, slab foundation insulation costs the home or property owner anywhere from $300 to $600 for an 1,800 square foot home, according to the U.S. Department of Energy. Conversely, spray-on insulation can cost as little as $200 and as much as $600, depending on the size of the job. Note that both types of insulation are based on R ratings set forth by International Energy Conservation Code and can be purchased with a 10 rating, meaning each type is very efficient; but, this rating doesn’t affect the cost of the materials.

Installation

• Spray-on installation is a do-it-yourself job since the machines are rentable, but unless you have contracting or homebuilding experience, slab foundation insulation is best left to experienced professionals. Slab insulation has to be carefully laid against the home’s exterior and may or may not require the need for additional materials under the advisement of a pest control specialist. Spray-on insulation can be applied by anyone, but if an area isn’t properly insulated, heat will continue to escape.

A Word of Caution

• Each insulation type isn’t without a drawback. For slab type, termites are a major concern. Luckily a termite specific insecticide can be used as an after-coating over the foundation boards to inhibit access to the wood underneath. For spray-on type, if open cell foam is chosen it is more likely the house will retain moisture that, over time, may contribute to mold growth.