Since 1898, the American Society for Testing and Materials (now called ASTM International) has developed technical standards for a wide variety of building materials. They test for things like burn resistance. For weather-resistant barriers (WRBs), ASTM has developed rigorous tests for water resistance and water penetration, plus an air barrier assembly test. But an equally important test is ASTM E96, which measures water vapor permeability over a 24-hour period.
Even after exterior cladding goes up, walls can get wet. Small amounts of moisture in the wall turn to gas (water vapor) that needs to escape. If walls can't dry out thoroughly, the home is susceptible to mold and rot.
The term vapor permeability (sometimes called "breathability") refers to a material's ability to let water vapor pass through it. ASTM E96 measures this in units called "perms" - and today's building codes require WRBs to provide 5 perms or higher.
Since the 1960s, many builders have relied on plastic house wraps to achieve superior vapor permeability. But house wraps are applied after traditional sheathing is installed and approved by code officials. Then a crew has to return to wrap and tape the whole house.
In contrast, a product like new LP WeatherLogic™ Air & Water Barrier requires fewer steps. The sheathing and weather-protective layer are combined in a single panel that can be installed just like regular sheathing. The panel seams are then securely taped with an advanced acrylic tape that features one of today’s highest quality adhesives. And because the vapor-permeable overlay is permanently integrated into the panel, it won’t tear or blow away.
One of the best ways to get a tight building envelope is to use a structural panel like LP WeatherLogic barrier where the sheathing and vapor-permeable layer are tightly bonded during the manufacturing process. It's a breakthrough that involves fewer steps and less waiting than using house wrap.
Do you frequently build in regions with heavy rain or strong winds? 2021 is projected to be a severe storm season, which means your builds will need some extra reinforcement. Finding the most durable siding or building solution for your projects can be confusing. Thankfully there are practical ways and durable products to help prevent damage and help protect against harsh weather so you can be prepared before the storm season arrives.Continue Reading
You're likely building more smaller houses than you were about five years ago. Homeowners across the country want affordability, energy efficiency, or simply less home to clean and maintain so they have the weekend to explore-or they're empty nesters. Whatever the reason, they still want their small home exterior to have maximum curb appeal and have all the charm and pizzazz of a larger home.
Green building has moved from a trending industry practice to an industry standard. With the growth in demand for sustainable practices, there are a host of initiatives surrounding green building codes and standards. Keeping track of these standards can be difficult. We've created a resource for building professionals to refer to as you navigate the world of green building.
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