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Q.What is the best vinyl trim detail to use on the wide angles of bay windows? The house in question does not have enough room at the corners to use a vinyl outside corner piece, which would be too wide. Is it acceptable to use a piece of inside corner trim, bent backwards, or is there a better trim product available?

A.Doug Price, vice president of marketing at Norandex-Reynolds, a vinyl siding manufacturer, responds: An inside corner piece bent backwards may look unattractive. Depending on the trim configuration, it may also lack pockets deep enough to accommodate the expansion of the siding. The best solution is to use a 45-degree bay corner post, a type of trim piece available from some siding manufacturers.

Unfortunately, 45-degree corner posts are usually available in a limited number of colors. If you can’t locate the right type of vinyl trim, you can always install a piece of wood trim and wrap it with aluminum trim coil in a color that matches the siding or trim.