a. Box Sills. Figure 1-1 shows box sills. Box sills are often used with the common style of platform framing (either with or without a sill plate). With this type of ill, the part that lies on the foundation wall or ground is called the sill plate. The sill is laid edgewise on the outside edge of the sill plate.

b. T-Sills. There are two types of T-sill construction-sills commonly used in dry, warm climates (see Figure 1-2 ) and sills used in colder climates (see Figure 1-3 ). Although these T-sill constructions are similar, notice that in Figure 1-2 the joists are nailed to the studs and sole plates. In Figure 1-3 the joists are nailed to the studs and sills and headers are used between the floor joists.

c. Built-Up Sills. Joints are stagger where built-up sills are used. Notice in Figure 1-4 how the built-up sill corner joints are made. Heavier sills are used if posts are used in the foundation. Sills are single heavy timbers or built-up of two or more pieces of timber (see Figure 1-5 ). Where heavy timbers are used, the joints should be placed over the post (see Figure 1-6 ).