Fiber Cement Siding R Value

That means you ll need to use a superior grade of insulation inside of your walls attic and crawl space to ensure that your home is up to code in this regard.

Fiber cement siding r value.

Foam thicker than a half inch will yield even higher r values. Esr 1844 noncombustibility see page 1 section 3 1 flame spread and smoke developed see page 1 section 3 1 1 hour fire walls see page 2 section 4 3 design wind loads see page 4 5 table 4 r values see page 3 table 2. Most siding including fiber cement have an r value of less than 1 when installed alone with out additional layers or types of insulation. Because vinyl siding is thinner than fiber cement siding it can better accommodate insulation beneath its surface.

This beats fiber cement which has an r value of 5 at most. Asbestos lagging and paste will have a lower value. R value see table 2. Asbestos cement shingle siding.

If you choose fiber cement siding for your project then the r value of the product is only 0 5. This is an increase of 13 of effective thermal resistance. That s a little less than you ll get from vinyl siding which is rated as r 0 61 but the. As we said before the r value measures the thermal resistance of a material.

Half inch thick rigid foam insulation has an r value of r 2 to r 3 5. Asbestos cement board r value. Underlayment material even a foam board doesn t offer much extra and would be applicable to both materials. 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.

This means as a stand alone product fiber cement isn t going to add much insulation to your home. Fiber cement siding doesn t add much insulation to your wall system measuring in at a mere r 0 50. When vinyl siding is optionally insulated it can achieve r 2 values and even greater. Adding foam back vinyl siding leaves fiber cement in the dust as that has at minimum 1 8 r value.

Hardiepanel siding cempanel siding. Asbestos loose packed fibers powder. 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. Standard vinyl siding has an r value 6.