Like insulation, caulking helps to keep a house tightly sealed, adding to its energy efficiency and comfort. Caulk is a pliable material used to seal the seam where different buildings materials meet, such as between the window jamb and siding.

When choosing caulking products, consider cost and longevity. The caulk should have at least a 25-year life. Acceptable options include acrylic latex caulk with silicones, silicone caulk, and urethane caulk. If you plan to paint over the caulk, be sure the type you use is paintable.

Types Of Caulk:

Oil or resin-based caulk- readily available and will bond to most surfaces - wood, masonry, and metal; not very durable, but cheapest. Latex, butyl, or polyvinyl-based caulk- all readily available and will bond to most surfaces; more durable, more expensive than oil or resin-based caulk. Elastomeric caulks- most durable and most expensive; includes silicones, polysulfides and poly-urethanes.

Basic Procedure:

1.	Before applying caulking compound, clean area of paint build-up, dirt, or deteriorated caulk with solvent and putty knife, wire brush, or screwdriver.

2.	Drawing a good bead of caulk will take a little practice. First attempts may be a bit messy. Make sure the bead overlaps both sides for a tight seal.

3. Draw bead wide enough to make sure caulk adheres to both sides of gap. 4. If the crack is wider than 1/4", use backing material to fill the gap, then cover with caulk.