Construction beams are a major part of many different types of construction projects, be they residential, commercial, or public. They provide support for floors and ceilings, and come in a variety of forms.
Sills are the horizontal timbers of a building which either rest up the masonry foundations or, in the absence of such, form the foundations. The sill is the foundation that supports all of the building above it. The type of sill used depends on the type of construction used in the frame.
Rotten beams and sill plates are a common occurrence in old houses and this can be a big problem. The good news is that many of them can be replaced using common tools, common materials, and common sense.