As a symbol of fine craftsmanship, curved stairways have made a valiant stand against automation. Even the factory- built ones have always been laborintensive items. But that's starting to change. Fiberwood Stairway s are true radius semicircle stairs that are built with modern techniques to achieve a traditional result. The Fiberwood carriage is made from molded fiberglass, and includes the finished risers and skirtboards; the treads, railings, and balusters are made from solid wood. The result, says the company that makes it, is a strong, squeak-free structure that looks like a traditional stair but that costs less and installs in a fraction of the time. Contact : Fiberwoo d Inc., 391 Soundview Rd., Guilford, CT 06437; 203/458-8920. Against the Wind Housewrap