Fiber Cement Board Siding R Value

Fiber cement and vinyl r values.

Fiber cement board siding r value.

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. Foam thicker than a half inch will yield even higher r values. 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. 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. This very durable siding material is quickly finding its way onto more homes due to its good looks fire resistance and high resale value. We ve been providing a better way to build for over 100 years. You may have seen fiber cement board or siding and didn t even recognize it.

R value see table 2. 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. Your nearest restaurant bank theater or grocery store just might be sided with nichiha fiber cement board. Fiber cement insulated vinyl siding and fiber cement can both provide a durable exterior solution for your project.

James hardie is the world leader in fiber cement siding and backerboard. 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. When tested in accordance with astm e96. This siding material which can be made to resemble wood grain or even stucco has actually been around for 100 years.

If you have never heard of nichiha fiber cement siding you are not alone. Hardiepanel siding cempanel siding. Founded in the mid 1950s this diversified japanese company has been quietly producing fiber cement siding products for years mainly for commercial properties. Thermal resistance r values for the panels are as shown in table 2.

07 46 46 fiber cement siding report holder. This is an increase of 13 of effective thermal resistance. Insulation has an r value of r 2 to r 3 5. 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.