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 Trends6 min

What Do We Mean When We Say LP SmartSide Acclimates to its Environment?

We hear it time and time again from first-time LP® SmartSide® Trim & Siding users: “Why do installation instructions on how to install lap siding call for a 3/16-inch gap between vertical joints?” We’re here to explain that instructions for installing specify this gap for good reason—to allow the siding to expand during the acclimation process.

Continue Reading
Industry Trends4 min
Resilient Construction: How To Make Your Builds More Weather-Resistant

You may have recently heard the terms “resilient construction” or “weather-resistant building” being used more frequently within the architectural and construction industries. But what do these terms mean exactly? The Resilient Design Institute defines resilient construction (or resiliency) as “the capacity to adapt to changing conditions and to maintain or regain functionality and vitality in the face of stress or disturbance.”

Business Advice3 min
Top 5 Benefits of LP® BuildSmart™ Preferred Contractor Program

When it comes to the wide variety of contractor loyalty programs that exist on the market, the tangible payoff it can have on your business is not always clear. But, not to worry. Today we break down the details of the LP® BuildSmart™ Preferred Contractor Program.

It’s Getting Hot in Here: The Benefits Of LP® TechShield® Radiant Barrier

Radiant barriers have become very popular with efficiency-minded builders in the recent years. This is largely due to the fact that when installed properly, a radiant barrier can reduce the impact of summer heat and yield tangible savings in cooling costs of a home—a persuasive selling point when addressing potential homeowners. But how does radiant barrier work and what exactly are its effects?