CAULK:

(Page 4 of 4)

October/November 2001
 
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Caulked joints should have a concave shape, with thick sides to ensure good adhesion and a thinner middle to allow the joint to expand and contract. If the caulk sticks completely to the back of the crack it will be less able to stretch and more likely to pull away or tear. To prevent this, you can use a plastic foam backer rod in gaps over one-quarter inch thick. Available in several diameters, backer rods not only prevent sagging, they also provide extra insulation and save caulk.

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To apply the caulk, the pros are equally divided between the push and pull methods. Pull advocates say their method produces a smoother bead, while caulk pushers claim their method forces more caulk into the joint. Whichever you choose, the key is to squeeze out an even, full bead that completely fills the crack. As you near the end of the joint, release the handle pressure to avoid excess.

Finish by smoothing the bead. This tooling does more than smooth the surface: It forces material into the gap, fills minor voids and pushes material against the sides to ensure good adhesion. The most common tooling device is your finger, but you can also use an ice cube, the back of a spoon or a commercial device. Whatever you use, try to tool the joint just once: Overtooling can remove too much material from the joint. Minor bumps can be trimmed off with a razor blade after the caulk has cured.

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