Fiber Cement Siding R Value

Fiber cement siding is one of the better options for siding your home.

Fiber cement siding r value.

Standard vinyl siding has an r value 6. Fiber cement insulated vinyl siding and fiber cement can both provide a durable exterior solution for your project. That s a little less than you ll get from vinyl siding which. Adding foam back vinyl siding leaves fiber cement in the dust as that has at minimum 1 8 r value.

Thermal conductivity k 0 744 for cement board k 0 14 for asbestos millboard and k 1 66 for asbestos cement sheets. R value see table 2. Insulation has an r value of r 2 to r 3 5. Because vinyl siding is thinner than fiber cement siding it can better accommodate insulation beneath its surface.

When vinyl siding is optionally insulated it can achieve r 2 values and even greater. Current sources of asbestos r values such as engineeringtoolbox provide very inconsistent data. 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. 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.

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. We already discussed the thickness of each material. This beats fiber cement which has an r value of 5 at most. Foam thicker than a half inch will yield even higher 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. While fiber cement siding is energy efficient vinyl siding has the potential for this too. R 11 r 15 2 x 4 framing 2 x 6 framing r. Find the best fiber cement siding brands you may want to choose.

This is an increase of 13 of effective thermal resistance. But the same source puts asbestos cement k 2 07 and for loosely packed asbestos k 0 15 this is very inconsistent data. 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. Hardiepanel siding cempanel siding.

Fiber cement and vinyl r values.