Water Resistive Barrier
Water-resistive barriers (weather-resistant sheathing paper) (WRB) have been required by the model building codes for many years and have been required by the International Code Council model codes since their inception in 2000. The purpose of this report is to summarize the requirements found in the various standards and evaluation agency criteria, evaluate relevant and available test data, and provide a recommendation for the fair treatment of all products based on one performance-based benchmark for water-penetration resistance of WRB assemblies.
In general, the description of any building, whether a high-rise or a warehouse, can be simplified into two basic components: 1) the building structure, which gives the building its overall shape and resists forces from sources such as wind, snow, people, furniture (live loads), and the weight of fixed building components (dead loads); and 2) the building envelope, which separates the indoor and outdoor environments, keeping the weather outside and conditioned air inside.
Building science studies have recognized the importance of the proper installation of flashing and its integration with the water resistive barriers as very important to the success of a wall assembly. The roll of flashing is to direct water away from the opening to the water resistive barrier, which in turn directs the water to the exit point in the wall. The integration of these two elements and the quality of their installation is ultimately important to the success of the wall system. It is equally important to select products, which perform as intended after installation.
This guide provides information and recommendations to the following groups: insulation contractors; general contractors; builders; home remodelers; mechanical contractors; and homeowners, as a guide to the work that needs to be done. The order of work completed during home construction and retrofit improvements is important. Health and safety issues must be addressed first and are more important than durability issues. And durability issues are more important than saving energy. Not all techniques can apply to all houses. Special conditions will require special action.
General discussion on the use of FPIS as a WRB, Air barrier or vapor retarder.
An Introduction, Overview and Outline for the Code-Compliant & High Performance Walls presentation.