Fiber Cement Siding R Value

While fiber cement siding is energy efficient vinyl siding has the potential for this too.

Fiber cement siding r value.

Asbestos cement board r value. Asbestos lagging and paste will have a lower value. Adding foam back vinyl siding leaves fiber cement in the dust as that has at minimum 1 8 r value. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15.

This beats fiber cement which has an r value of 5 at most. As we said before the r value measures the thermal resistance of a material. R value see table 2. Because vinyl siding is thinner than fiber cement siding it can better accommodate insulation beneath its surface.

This is an increase of 13 of effective thermal resistance. Standard vinyl siding has an r value 6. Foam thicker than a half inch will yield even higher r values. Asbestos loose packed fibers powder.

Half inch thick rigid foam insulation has an r value of r 2 to r 3 5. If you choose fiber cement siding for your project then the r value of the product is only 0 5. Thermal conductivity k 0 15. This means as a stand alone product fiber cement isn t going to add much insulation to your home.

Hardiepanel siding cempanel siding. Underlayment material even a foam board doesn t offer much extra and would be applicable to both materials. Most siding including fiber cement have an r value of less than 1 when installed alone with out additional layers or types of insulation. Fiber cement siding doesn t add much insulation to your wall system measuring in at a mere r 0 50.

Asbestos cement shingle siding. 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. When vinyl siding is optionally insulated it can achieve r 2 values and even greater.