When it comes to replacing your siding one factor which is often over looked is the R-Value. The technical definition of R-Value from a siding or renovation perspective is a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on; the higher the number, the greater the resistance to heat flow.
Q: What are the “R” values for Hardiplank siding?
A: The “R” value range is .05 – .19. However, once the existing siding is removed, we might install Tuff-R 1/2″ sheathing insulation which adds an additional 3.3 R value. Dow states, “the homeowner can realize an energy savings of 25% on the heating and cooling portion of their utility bill.” This is a fairly large energy savings and this is supported by the manufacturer. Having said that, our philosophy is even a 10-15% utility savings when you are required to update or replace your siding anyways is a tremendous benefit.
In addition, ask about a Tyvek Home Wrap as a moisture and air infiltration barrier which gives additional R value. Be sure to ask about installation options and the benefits of sheathing when you are considering doing a renovation.
