Menu
Business Advice5 min

The Importance Of Vapor Permeability In Building Envelopes

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.

The Difference Between House Wrap and WRB

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.

Continue Reading
Industry Trends5 min

Tighter Building Envelopes

Overall, improvements in building envelopes have helped homeowners benefit from greater protection against moisture. Builders are able to create more energy-efficient homes overall due to these developments. However, when the exterior envelope doesn’t allow a structure to breathe, any moisture that gets trapped inside simply rots—causing more problems than intended. What is the solution to needing a tight building envelope that allows for proper airflow? Symbiotic materials, such as the LP Structural Solutions portfolio of products, provide an answer.

Continue Reading
News & Stories6 min
On the Jobsite with LP Technical Sales Manager – Oscar Trejo

We’re joining Oscar Trejo, LP Technical Sales Manager, for a typical day on the job sharing his knowledge about one of the most durable siding solutions available—LP® SmartSide® Trim & Siding. Trejo dedicates his time to providing construction training for building professionals, assisting on the jobsite, and leading his team at LP.

News & Stories4 min
HOW IS THE PAST IMPACTING THE FUTURE OF THE BUILDING INDUSTRY?

As a leader in building solutions, LP Structural Solutions is consistently moving in the direction of greater resiliency. Each innovative building solution is viewed through that lens, as well as how it can help achieve LP’s overall goal of Building a Better World™. But why this direction? What led LP to focus on resilience in construction? Craig Miles, Director of OSB Sales & Marketing, explores how past trends inform LP’s work on modern building techniques today.

Business Advice5 min
PREPARING FOR PRIME SIDING SELLING SEASON

Coming off an unprecedented year, the busiest season for selling siding is almost underway! COVID-19 is still a significant consideration as you attempt to move forward with your siding business while taking learnings and challenges from the pandemic into consideration. We talked with Erik Perkins of Perkins Builder Brothers to get insight straight from the jobsite about COVID-19’s impact, tips for prepping for a new season, and more. Read on to see how LP can support you with one of the most durable siding options out there as your business ramps up!