Transcript Unit 61 — Interior Trim

PowerPoint® Presentation
Unit 61
Interior Trim
Wood Molding • Composite Molding •
Trimming Door Openings • Trimming
Window Openings • Installing Base
Molding • Installing Ceiling Molding
Unit 61 — Interior Trim
Softwood and hardwood lumber are used in the
manufacture of wood molding.
Unit 61 — Interior Trim
Wood moldings are trim pieces at
the juncture of walls and ceilings
and floor and walls, and at
intersections of other materials.
Unit 61 — Interior Trim
Molding is commonly
installed along the floor
and around door and
window openings. In
some cases, ceiling
molding is specified.
Unit 61 — Interior Trim
Door casing patterns may be contemporary or
traditional in design. Door casing is usually backed
out to produce a tight fit.
Unit 61 — Interior Trim
Door casing is nailed to the
trimmer stud and side jamb.
Unit 61 — Interior Trim
A 45° miter cut is
usually required at the
joints between the top
piece and the side
pieces of door casing.
Unit 61 — Interior Trim
When trimming a door
opening, first mark the
doorjamb at intervals for
a 1/8″ reveal.
Unit 61 — Interior Trim
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.
Unit 61 — Interior Trim
Specialty clamps
may be used to apply
pressure to a miter
joint to allow the
glued joint to reach
its full strength.
Unit 61 — Interior Trim
Interior window trim for wood-framed
windows may be either contemporary
or traditional in design. Window trim
should match door trim in the building.
Unit 61 — Interior Trim
Traditional window trim requires a
rabbeted stool. A variety of patterns
are available.
Unit 61 — Interior Trim
When a stool and apron are
installed, a corner return is
used to conceal the end grain.
Unit 61 — Interior Trim
Base molding is held tightly to the
finished floor and nailed to the bottom
plate and studs.
Unit 61 — Interior Trim
Base molding is usually
thinner than the door
casing it butts against.
Unit 61 — Interior Trim
Base molding may be
applied with a base shoe
and base cap.
Unit 61 — Interior Trim
For an inside corner fit, one piece
of the base molding must be cut for
proper fit.
Unit 61 — Interior Trim
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.
Unit 61 — Interior Trim
When fitting base
molding, first fit and
cope the inside
corner of one piece,
then miter the
outside corners.
Unit 61 — Interior Trim
The three basic profiles of ceiling
molding are rectangular with a
beveled edge, cove, and crown.
Unit 61 — Interior Trim
When installing crown molding,
one of the inside corner pieces
is coped.
Unit 61 — Interior Trim
When cutting a 45°
angle on crown molding,
position the molding with
the bottom edge pressed
against the fence of the
miter box.