Fiber Cement Siding R Value

Thermal conductivity k 0 744 for cement board k 0 14 for asbestos millboard and k 1 66 for asbestos cement sheets.

Fiber cement siding r value.

R value see table 2. When vinyl siding is optionally insulated it can achieve r 2 values and even greater. R 11 r 15 2 x 4 framing 2 x 6 framing r. 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. 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. 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. Because vinyl siding is thinner than fiber cement siding it can better accommodate insulation beneath its surface.

That s a little less than you ll get from vinyl siding which. Insulation has an r value of r 2 to r 3 5. Fiber cement siding is one of the better options for siding your home. We already discussed the thickness of each material.

Fiber cement siding while not inexpensive is a high resale value siding choice that offers equally high aesthetic appeal. Adding foam back vinyl siding leaves fiber cement in the dust as that has at minimum 1 8 r value. Fiber cement insulated vinyl siding and fiber cement can both provide a durable exterior solution for your project. Current sources of asbestos r values such as engineeringtoolbox provide very inconsistent data.

This beats fiber cement which has an r value of 5 at most. 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. Hardiepanel siding cempanel siding.

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 siding doesn t add much insulation to your wall system measuring in at a mere r 0 50. Find the best fiber cement siding brands you may want to choose. This is an increase of 13 of effective thermal resistance.

While fiber cement siding is energy efficient vinyl siding has the potential for this too.