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.
Big builder market share has doubled in the last 25 years and now represents about 50 percent of housing starts nationwide – and even 75 percent in some major metro areas. These mega-builders have huge budgets for both land development and marketing. It’s increasingly difficult for small and medium-sized builders to compete, but LP is committed to helping them prosper.Continue Reading
To better serve its customers in areas of order accuracy and delivery predictability, LP has set some of the industry’s most aspirational supply chain goals. Senior leaders meet regularly with experts at Gartner, arguably the nation’s best consulting firm in the realm of supply chain optimization. The aim is to apply best practices in procurement, logistics and working capital across more than $1 billion of addressable spend.
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