Fiber Cement Siding R Value

Hardiepanel siding cempanel siding.

Fiber cement siding r value.

Because vinyl siding is thinner than fiber cement siding it can better accommodate insulation beneath its surface. Fiber cement siding is one of the better options for siding your home. Fiber cement siding while not inexpensive is a high resale value siding choice that offers equally high aesthetic appeal. According to table 5 1 of the ashrae fundamentals handbook fiber cement has an r value of 15 better than brick and stone but lower than vinyl at r 60 wood at r 81 and insulated vinyl siding at r 2 0 3 5.

That s a little less than you ll get from vinyl siding which is rated as r 0 61 but the. But the same source puts asbestos cement k 2 07 and for loosely packed asbestos k 0 15 this is very inconsistent data. This is an increase of 13 of effective thermal resistance. While fiber cement siding is energy efficient vinyl siding has the potential for this too.

Fiber cement offers minimal energy savings at 15 r value but can be installed with fanfold or insulating sheathing products to improve the r value of the whole siding system. When vinyl siding is optionally insulated it can achieve r 2 values and even greater. Current sources of asbestos r values such as engineeringtoolbox provide very inconsistent data. R value see table 2.

Fiber cement siding doesn t add much insulation to your wall system measuring in at a mere r 0 50. In short hardie siding makes homes far more efficient than vinyl. Adding inch of rigid foam insulation r 2 in this example will increase a 2x6 stud wall from an effective r 15 to an effective r 17. Foam thicker than a half inch will yield even higher r values.

Half inch thick rigid foam insulation has an r value of r 2 to r 3 5. Find the best fiber cement siding brands you may want to choose. However hardie siding now has an insulated backing giving it an r value of 3 while typical vinyl has an r value of less than 2.