Are your windows and doors caulked? With winter approaching, the homeowner may be thinking about this task. The Ins and Outs of Caulking by the late Charles Carll will tell you everything you need to know.
Caulk is sometimes used in residential construction to inhibit rainwater intrusion where wall cladding interfaces with windows and doors (fenestration units) and is commonly used where utilities (such as pipes, vent hoods, and electrical conduit) penetrate the wall. Prior to development of modern caulks, caulk typically wasn’t used at the interfaces of wood siding and fenestration units. Although not assumed to be watertight when subjected to windblown rain, these interfaces nevertheless usually did not leak noticeably. Fenestration units were designed to shed water at sills and drip it beyond the exterior of the cladding (siding) system. Siding pieces were tightly fitted to jamb casings and were shingle-lapped with sills with head flashing or drip cap at heads or both.
Different styles of buildings call for different techniques in caulking, as the photos below show.