Fiber Cement Siding R Value

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Fiber cement 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. 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. R value see table 2.

Homeadvisor s siding comparison guide explores the differences pros and cons of fiber cement and vinyl including information on james hardie s hardie board hardiplank fiber cement. Compare costs easy of installation colors painting options durability thickness r value length of life and more to decide which is the best siding for your home. Current sources of asbestos r values such as engineeringtoolbox provide very inconsistent data. Fiber cement siding while not inexpensive is a high resale value siding choice that offers equally high aesthetic appeal.

We already discussed the thickness of each material. While fiber cement siding is energy efficient vinyl siding has the potential for this too. Standard vinyl siding has an r value 6. Thermal conductivity k 0 744 for cement board k 0 14 for asbestos millboard and k 1 66 for asbestos cement sheets.

This is an increase of 13 of effective thermal resistance. Adding foam back vinyl siding leaves fiber cement in the dust as that has at minimum 1 8 r value. Find the best fiber cement siding brands you may want to choose. Fiber cement and vinyl r values.

Fiber cement siding doesn t add much insulation to your wall system measuring in at a mere r 0 50. That s a little less than you ll get from vinyl siding which. But the same source puts asbestos cement k 2 07 and for loosely packed asbestos k 0 15 this is very inconsistent data. 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.

Fiber cement insulated vinyl siding and fiber cement can both provide a durable exterior solution for your project. When vinyl siding is optionally insulated it can achieve r 2 values and even greater. 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.

Insulation has an r value of r 2 to r 3 5.