Best Moisture Barrier Under Hardie Siding

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Best moisture barrier under hardie siding.

I m at the point of beginning to consider what to put under the siding specifically as a vapor barrier. Although your siding is your home s first defense against wind many types have small gaps and cracks at the joints where siding panels line up. Water will remain between the siding and the moisture barrier for a time but it will eventually dry out rather than soaking into interior wall parts for the long term. Hardiewrap weather barrier is installed over the sheathing beneath the exterior siding to reduce water and air infiltration.

According to joseph lstiburek with the building science corporation the ideal wrb perm for balancing the inward and outward flow of moisture in a wall system is between 10 and 20 perms. He called me for an opinion and i referred him to the hardi web site where it said that the barrier is required. And that leads to air infiltration and seepage the kinds of things that drive up energy costs. The homes i built then still look brand new today.

Moisture barrier house wraps do the same thing but for rain snow and other outside moisture. I m taking all the siding off repairing what i can insulating and installing hardie siding. But it can t be so high that the moisture can penetrate from the outside into the wall system. Any lower and you might see a few nail heads poking through the bottom of the next board any higher and your siding is likely to be loose and.

The builder did an investigation and said that a certain kind of osb was. I ve been using hardie siding in the texas heat for over 10 years. Hardie plank siding has a nail line across the top of the board that is 1 down from the top and nails are supposed to fall between and 1 from the top of the board to give the best hold. He has a 1994 home with hardi plank siding.

The standard weather barrier used traditionally under wood vinyl and other siding materials is 15 pound felt. Hardiewrap weather barrier may be used as both a water resistive barrier and as an air barrier in accordance with nationally recognized residential and commercial building codes as specified in esr 2658 hardiewrap weather barrier is installed over the sheathing beneath the exterior siding cladding to reduce water infiltration and air. It was originally wood dutch lap and that was covered with felt paper and asbestos siding. Instantly access installation info technical bulletins sds sheets more.

A high perm means the wrap has high vapor permeability. I m trying to help out a friend.