A spacer for sealing a joint between a first component and a second component of an entryway. The spacer may include substantially rigid support and a first gasket having a first uncompressed thickness (T1). The first gasket is attached to a first surface of the support. The first surface has at least one first boss extending therefrom by a distance (D1) such that (D1) is less than (T1). The at least one first boss is configured to abut a portion of the first component to provide the desired compression of the first gasket between the first component and the support.