Best Moisture Barrier Under Hardie Siding

Would it be better insulation if i remove the celotex and use a 1 foam board instead.

Best moisture barrier under hardie siding.

If your contractor installs hardie siding when it s saturated it may show signs of shrinkage or even staining over time. They will breath and excessive moisture should escape through the exterior siding. Aspyre by james hardie. 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.

Hardiepanel vertical siding. Install tech docs. 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. But it can t be so high that the moisture can penetrate from the outside into the wall system.

They both stop liquid water infiltration but water vapor is a different story it must be able to pass through. Hardiewrap weather barrier must be installed with the printed side out for best performance. Hardieplank does not require a vapor barrier it requires a weather resisting barrier wrb. Install tech.

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. Hardiewrap weather barriers. That keeps drafts from reaching your insulation and prevents heated and cooled air from seeping out through the walls. Also by james hardie.

Ultimately the back of. Hardieplank lap siding. Hardiebacker cement boards. 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.

Depending on how it s hung house wrap can either act as a moisture or wind barrier. Luckily it takes lots of water to saturate hardie products. Also 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.

In order to increase the insulation values i want to first add a layer of the rigid foam board. 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. 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.