Which wood is considered less desirable for sills in areas prone to insects?

Pine is considered less desirable for sills in areas prone to insects due to its natural susceptibility to insect damage, particularly from termites and carpenter ants. While pine is widely used in construction due to its availability and cost-effectiveness, it lacks the natural preservatives that make other types of wood more resistant to insect infestation.

Pressure-treated lumber, redwood, and cedar have properties that help protect them against pests. Pressure-treated lumber is chemically treated to resist moisture and pests, while redwood and cedar have natural oils that act as deterrents to various insects. This makes them better choices for sills, especially in environments where insect activity is a concern.