Best Moisture Barrier Under Hardie Siding

Install tech docs.

Best moisture barrier under hardie siding.

Hardiepanel vertical siding. 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. But it can t be so high that the moisture can penetrate from the outside into the wall system. Would it be better insulation if i remove the celotex and use a 1 foam board instead.

Ultimately the back of. Hardieplank does not require a vapor barrier it requires a weather resisting barrier wrb. 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. They will breath and excessive moisture should escape through the exterior siding.

Also by james hardie. 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. In order to increase the insulation values i want to first add a layer of the rigid foam board. They both stop liquid water infiltration but water vapor is a different story it must be able to pass through.

Hardiewrap weather barriers. If your contractor installs hardie siding when it s saturated it may show signs of shrinkage or even staining over time. Install tech. Luckily it takes lots of water to saturate hardie products.

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. Hardiewrap weather barrier must be installed with the printed side out for best performance. Hardieplank lap siding. That keeps drafts from reaching your insulation and prevents heated and cooled air from seeping out through the walls.

Aspyre by james hardie. 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. Also by james hardie. 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.

A high perm means the wrap has high vapor permeability. Hardiebacker cement boards. 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.