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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.

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Inspiration5 min

Most Popular Home Styles by Region

From Cape Cods in the Northeast to modern houses overlooking the Pacific, you can often tell where you are in the U.S. by the most popular home styles around you. Have you ever wondered what is the most popular home style in your region? We asked David Klarich, a regional marketing manager with LP, about architectural styles that stand out most to him in each region of the U.S.

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Business Advice3 min
Proving Not All Radiant Barriers Offer The Same Advantages

Radiant barriers are a tremendous value in warmer Southern climates, helping reduce radiant energy from heating the attic that result in lower attic temperatures helps reduce cooling costs. But do all radiant barriers perform the same? Do all perforated radiant barriers dissipate moisture? Why not simply use spray foam? Let's dive into these questions, learn how radiant barriers work, and see which product may perform best in your customers' homes.

News & Stories4 min
Key Takeaways from NAHB IBS 2020

The NAHB International Builders’ Show (IBS) 2020 was a busy and exciting show for LP, including several product introductions, illustrations of new ways of thinking, and engagement among builders and remodelers.

News & Stories4 min
Introducing LP® SmartSide® ExpertFinish® Trim & Siding

A leading manufacturer of engineered wood trim and siding products, LP® SmartSide® Trim & Siding is known for delivering advanced durability that doesn't compromise on beauty. LP Building Solutions is expanding its portfolio with the introduction of LP® SmartSide® ExpertFinish® Trim & Siding. A new prefinished siding option, the product features the durability you've come to expect from LP SmartSide Trim & Siding-now in color.