Is Your Lumber Too Wet? Ask the Barn Geek

Hey everyone, it’s the Barn Geek here. Today, I received a question via email that I wanted to address in this video. The question is: what is the ideal moisture content for building a barn with timber? Is my lumber too wet?

Now, when it comes to moisture content, there’s not a one-size-fits-all answer, but I’ll do my best to provide some guidance.

For softwoods like pine, aiming for a moisture content between 18 to 20 percent is generally ideal. Hardwoods, on the other hand, can usually do well with a slightly lower moisture content, around 12 percent. However, it’s important to note that achieving exactly these percentages isn’t always necessary or practical.

Traditionally, barns have been built using green timber, meaning the wood hasn’t been fully seasoned. This method has been employed for centuries because builders understood how wood behaves as it dries and seasons. The key is to work with the characteristics of the wood, ensuring that any potential movement or changes in the wood’s shape won’t compromise the structure.

When selecting timber, avoid severely warped or twisted logs, as these may pose challenges during construction. It’s also worth noting that certain species, like white pine or Douglas fir, are generally more forgiving in terms of moisture content compared to others.

If you’re harvesting your own timber, consider cutting it during the winter when the sap content is lower. Then, allow the timber to season gradually, either by sawing it into beams or stacking it with adequate airflow. Painting the ends of the timber can help prevent rapid drying.

While moisture content is important, it’s also essential to allow the structure time to acclimate to its environment. Rushing the process by enclosing the structure too quickly can lead to issues like trapped moisture, which can affect the integrity of the building over time.

In summary, while aiming for specific moisture content levels can be beneficial, it’s equally important to understand the behavior of the wood you’re working with and to allow the structure time to adapt naturally. Building a barn is a process that requires patience and a respect for the materials involved.