The Ultimate Weatherproofed Home

CodeWatcher Typar

In the last installment of a four-part series, a building science expert boils weatherproofing down to this: If you want the best solution for air and water infiltration, take a systems approach.

No matter how advanced a weather-resistant barrier (WRB) material is, it alone cannot be counted on to protect a structure from Codewatcher Typarunwanted air and moisture movement without taking the whole assembly into consideration. It is important to specify compatible materials to ensure all components work together.

“There are many components to a structure–wall, siding, insulation, plywood, and internal components of a wall,” explains Bijan Mansouri, Technical Manager, TYPAR Construction Products. “What builders are looking for is an end wall that can give maximum performance–protection against water and moisture intrusion and energy efficiency. They need to understand that it is not one product, but rather a system working together as a group, that can achieve this.”

Trouble can arise when the materials aren’t compatible. For example, sealants with high solvent or plasticizer content can damage bitumen flashing products causing functional and aesthetic issues. Seams and tears that have not been properly taped could allow windblown rain to infiltrate the assembly, and failure to use galvanized roofing nails or plastic cap nails to attach the WRB to the sheathing and framing can also compromise performance. “Also, you don’t want two products next to each other that have lower or higher permeability than the other,” Mansouri says.

Related: Download the ebook Innovation Leads to High-Performance Building Solutions

Mansouri recommends that builders source products from one manufacturer because manufacturers design their products to be chemically compatible and performance compatible. “The opportunity to choose a product manufactured by the same company also provides peace of mind,” he says. “If there is an issue down the road on performance, the builder can deal with one manufacturer.”

The TYPAR Weather Protection System is a suite of products that includes WRBs, flashings and construction tape, and is covered by an industry-leading lifetime-limited warranty that includes both materials and labor.

Here’s the system in a nutshell:

  • TYPAR Drainable Wrap: Drainable Wrap provides uniquely strong protection from moisture, mold, and rot. It features an additional layer of integrated polypropylene fibers that creates a highly efficient gap for shedding excess water.


  • TYPAR Building Wrap: This wrap is a smart engineered weather-resistant barrier that provides optimal breathability for exterior walls by blocking air and water from getting in, but allowing moisture vapor to escape the wall cavity, which reduces the risk of standing water in the wall cavities that can potentially lead to mold growth and degradation of indoor air quality. TYPAR Building Wrap also meets the air barrier requirements of ICC-ES AC-38 and ASTM E1677 Standard Specification for an Air Retarder (AR) Material or System for Low-Rise Framed Building Walls.


  • TYPAR MetroWrap: A wrap engineered for buildings over four stories. The product’s strengths make it a superior choice for defending multi-family dwellings, light commercial projects and large commercial structures. With enhanced UV protection, it even helps you deal with project delays and changing timelines.


  • TYPAR Flashings and Tapes: These products are integral components for assuring that building envelopes perform at peak levels. They include all-temperature flashing, which can be used in temperatures as low as 0 F, flexible flashing for curved windows, zero-VOC butyl flashing, UV and weather-resistant construction tape, and double-sided seaming tape for sealing building wrap seams with a shingled effect.


  • TYPAR Flashing Panels: Through-wall penetrations can be a time-consuming challenge. And if not sealed off properly, they become weak points that leave a building envelope vulnerable. TYPAR Flashing Panels are designed for the tasks of blocking air leakage and water intrusion in some of the trickiest places of all. Features include electrical, plumbing, and A/C panels, self-seals around fasteners, and compatibility with most types of cladding.

Learn more about how TYPAR can help you manage moisture in your homes today. Visit