Best Moisture Barrier Under Hardie Siding

But it can t be so high that the moisture can penetrate from the outside into the wall system.

Best moisture barrier under hardie siding.

Hardieplank lap siding. 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. The best protection against condensation and moisture infiltration into the wall system of a steel sided building is the application of a high quality house wrap that meets and exceeds the requirements of the ibc 1402 2 and irc r703 1 1 for weather resistant barriers like barricade building wrap. When used to slow winds its job is to seal gaps and leaks in the osb panels or plywood sheathing that makes up your home s exterior walls.

A high perm means the wrap has high vapor permeability. Also by james hardie. Install tech. Luckily it takes lots of water to saturate hardie products.

Depending on how it s hung house wrap can either act as a moisture or wind barrier. Superior adhesion hardiewrap flashing adheres to sheathing and housewrap even in extreme temperatures and contains no asphalts vocs volatile organic compounds or solvents which can reduce adhesion over time. That keeps drafts from reaching your insulation and prevents heated and cooled air from seeping out through the walls. Hardiebacker cement boards.

Tyvec is not a vapor barrier it is an air penetration barrier just like the new zip system. They both stop liquid water infiltration but water vapor is a different story it must be able to pass through. Hardie siding does a great job of wicking moisture when it is installed on the wall but when it s uncovered and flat on the ground it will absorb water. Install tech docs.

If your contractor installs hardie siding when it s saturated it may show signs of shrinkage or even staining over time. Hardieplank does not require a vapor barrier it requires a weather resisting barrier wrb. Also by james hardie. Hardiewrap weather barriers.

Hardiepanel vertical siding. 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. Hardie plank recommends a maximum of 1 of foam board celotex type material under their lap siding so the 1 2 foam and 1 2 celotex would be fine. Ultimately the back of.

Would it be better insulation if i remove the celotex and use a 1 foam board instead. A wrb is more of a water and moisture resisting barrier than a vapor resisting barrier and it also serves when installed correctly as a drainage plane for water and moisture get behind the siding as will happen. They will breath and excessive moisture should escape through the exterior siding.