Fact Check: Are LVLs waterproof?

Are LVLs Waterproof?

Introduction

The claim in question is whether Laminated Veneer Lumber (LVL) is waterproof. This assertion is significant for builders and architects who need to understand the material properties of LVL when considering its application in construction, especially in areas exposed to moisture.

What We Know

Laminated Veneer Lumber (LVL) is an engineered wood product made from multiple layers of thin wood veneers bonded together with adhesives. The primary adhesive used in LVL production is phenol-formaldehyde, which is known for providing strong and durable bonds that are also resistant to moisture 2.

1. Material Composition: LVL is created from various wood species, which can include Douglas-fir, larch, pine, and spruce, allowing for a range of properties and applications 2.
2. Water Resistance: Some sources indicate that LVL can be treated with waterproof coatings or sealants to enhance its moisture resistance 45. However, LVL itself is not inherently waterproof; rather, it is designed to withstand some moisture exposure due to the properties of the adhesives used in its production 7.
3. Durability: According to industry sources, while LVL is more resistant to moisture than traditional lumber, it is not impervious to water damage. Proper installation techniques and protective coatings are recommended to ensure longevity in humid or wet environments 46.

Analysis

The evidence regarding the waterproof qualities of LVL is mixed, and the reliability of the sources varies:

• Source Reliability:

  • The Oklahoma State University Extension 1 provides a factual overview of LVL, discussing its properties and advantages without bias, making it a reliable source for understanding LVL's general characteristics.
  • The Naturally:Wood website 2 is a credible source as it is associated with the wood industry and provides detailed information about the properties of LVL, including its adhesive composition.
  • Ranger Truss 4 discusses practical applications and the importance of waterproof coatings, but as a commercial entity, it may have a vested interest in promoting LVL products.
  • PWT 5 claims that their LVL products have a water-resistant coating, which could indicate a marketing bias; thus, the assertion should be scrutinized for independent verification.
  • Fine Homebuilding 6 provides practical advice on using LVL in construction, emphasizing the need for protective measures, which aligns with the general consensus but may reflect a specific industry perspective.

• Methodology and Evidence: The claims about LVL's water resistance often rely on anecdotal evidence or manufacturer assertions. More empirical studies comparing LVL's performance in various moisture conditions would strengthen the understanding of its waterproof capabilities.

• Conflicts of Interest: Several sources promoting LVL products may have commercial interests that could influence their presentation of the product's capabilities. This potential bias necessitates careful consideration when evaluating their claims.

Conclusion

Verdict: False

The claim that Laminated Veneer Lumber (LVL) is waterproof is false. While LVL exhibits some resistance to moisture due to the properties of the adhesives used in its production, it is not inherently waterproof. Evidence indicates that LVL can be treated with waterproof coatings to enhance its moisture resistance, but without such treatments, it is susceptible to water damage.

It is important to note that the available evidence is mixed, with some sources potentially exhibiting bias due to commercial interests. Additionally, the lack of extensive empirical studies comparing LVL's performance in various moisture conditions limits the robustness of the conclusions drawn.

Readers are encouraged to critically evaluate information regarding construction materials and consult multiple sources to form a well-rounded understanding of their properties and applications.

Sources

1. Laminated Veneer Lumber (LVL) as a Construction Material. Oklahoma State University Extension. Link
2. Laminated veneer lumber (LVL) - Naturally:Wood. Link
3. Microllam® LVL Beams - Weyerhaeuser. Link
4. Are LVL Beams Waterproof? How Do They Impact Truss Durability? Ranger Truss. Link
5. PWT LVL. Link
6. Weatherproof Laminated Lumber - Fine Homebuilding. Link
7. What is Laminated Veneer Lumber (LVL) and How It's Made? - Timber Blogger. Link
8. Laminated Veneer Lumber (LVL) | Formula, Properties & Application. Link
9. Clear LVL Sealer - Vapor barrier for wood. Link
10. LVL Beams & Headers: Definitions, Properties, Spans & Description of ... Link