Fiber Cement Board Siding R Value

R value see table 2.

Fiber cement board siding r value.

You may have seen fiber cement board or siding and didn t even recognize it. 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 tested in accordance with astm e96. Insulation has an r value of r 2 to r 3 5.

That s a little less than you ll get from vinyl siding which. R 11 r 15 2 x 4 framing 2 x 6 framing r. Fiber cement and vinyl r values. 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.

Hardiepanel siding cempanel siding. 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. As we said before the r value measures the thermal resistance of a material. Fiber cement siding doesn t add much insulation to your wall system measuring in at a mere r 0 50.

07 46 46 fiber cement siding report holder. Founded in the mid 1950s this diversified japanese company has been quietly producing fiber cement siding products for years mainly for commercial properties. James hardie is the world leader in fiber cement siding and backerboard. We ve been providing a better way to build for over 100 years.

If you have never heard of nichiha fiber cement siding you are not alone. Thermal resistance r values for the panels are as shown in table 2. 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. 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.

This is an increase of 13 of effective thermal resistance. Board must be fastened to the framing members with 11 4 inch long 32 mm type s gypsum board screws spaced 24 inches 610 mm on center. Foam thicker than a half inch will yield even higher r values. This very durable siding material is quickly finding its way onto more homes due to its good looks fire resistance and high resale value.