DIY Closed

Other People Are Reading Closed-Cell vs. Open-Cell Foam Insulation

To gain a better understanding of DIY closed-cell foam insulation, it helps to have some knowledge of the other foam insulation option, which is open-cell. Open-cell insulation is also known in the market as low-density or ½,-lb. foam. When low-density foam is applied, it can expand more than 120 times its liquid form. Often, open-cell foam insulation must be trimmed after it cures and the waste must be discarded.

Cured open-cell has a soft structure. It is very cushion-like. It also has millions of tiny asymmetrical bubbles that burst during the curing process. These broken cells allow air and water to penetrate open-cell insulation. This is the major difference between closed-cell and open-cell insulation.

Closed-cell foam insulation can also be called 2-lb. or high-density foam. It expands anywhere from 20 to 30 times the initial liquid application. Although closed-cell foam insulation has the same microscopic bubbles present, the cells do not break and remain closed. The final form of closed-cell foam insulation is very rigid and much stronger than open-cell foam insulation. While open-cell foam insulation is more permeable, closed cells do not allow air or water to breach the insulation.

Installation Tips

Install closed-cell foam insulation on garages, rafters, walls and floors. Spray foam can be used in commercial and institutional buildings and any other place you would use fiberglass and loose-fill insulation. Some people use foam insulation on the underside of mobile homes.

You do not need to know how to use special equipment. The foam insulation comes in self-contained DIY closed-cell foam insulation kits. Just connect the hose with a spray mechanism attached to the other end. Connect the hose to a cylinder and start applying the foam. The container must be maintained at temperature as recommended by the product manufacturer to flow and expand properly.

In most cases, you will not need to install a vapor barrier, air barrier or used sealants when installing DIY closed-cell foam insulation. Since each municipality has its own building codes, find out what the building codes are for using foam insulation. Also find out what the R-values are for the various components in the area you reside.

Some local building codes may prohibit closed-cell foam insulation in attics. The concern is that it may not allow for water vapors to escape and for adequate ventilation. Remember, closed-cell foam insulation is virtually impenetrable by moisture or air. You may be able to install a wind-turbine ventilator in the roof to ensure adequate ventilation for the space. Check with your building department officials.

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