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Unit 61

Unit 61. Interior Trim. Wood Molding • Composite Molding • Trimming Door Openings • Trimming Window Openings • Installing Base Molding • Installing Ceiling Molding. Softwood and hardwood lumber are used in the manufacture of wood molding.

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Unit 61

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  1. Unit 61 Interior Trim Wood Molding • Composite Molding • Trimming Door Openings • Trimming Window Openings • Installing Base Molding • Installing Ceiling Molding

  2. Softwood and hardwood lumber are used in the manufacture of wood molding.

  3. Wood moldings are trim pieces at the juncture of walls and ceilings and floor and walls, and at intersections of other materials.

  4. Molding is commonly installed along the floor and around door and window openings. In some cases, ceiling molding is specified.

  5. Door casing patterns may be contemporary or traditional in design. Door casing is usually backed out to produce a tight fit.

  6. Door casing is nailed to the trimmer stud and side jamb.

  7. A 45° miter cut is usually required at the joints between the top piece and the side pieces of door casing.

  8. When trimming a door opening, first mark the doorjamb at intervals for a 1/8″ reveal.

  9. More shrinkage occurs across the grain than along the grain of wood. Since there is more width at the heel than at the toe of the miter, the heel of the miter joint opens up.

  10. Specialty clamps may be used to apply pressure to a miter joint to allow the glued joint to reach its full strength.

  11. Interior window trim for wood-framed windows may be either contemporary or traditional in design. Window trim should match door trim in the building.

  12. Traditional window trim requires a rabbeted stool. A variety of patterns are available.

  13. When a stool and apron are installed, a corner return is used to conceal the end grain.

  14. Base molding is held tightly to the finished floor and nailed to the bottom plate and studs.

  15. Base molding is usually thinner than the door casing it butts against.

  16. Base molding may be applied with a base shoe and base cap.

  17. For an inside corner fit, one piece of the base molding must be cut for proper fit.

  18. A scarf joint produces the best fit between two pieces of base molding joined along a wall. Scarf joints should always be glued to limit separation.

  19. When fitting base molding, first fit and cope the inside corner of one piece, then miter the outside corners.

  20. The three basic profiles of ceiling molding are rectangular with a beveled edge, cove, and crown.

  21. When installing crown molding, one of the inside corner pieces is coped.

  22. When cutting a 45° angle on crown molding, position the molding with the bottom edge pressed against the fence of the miter box.

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