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Tips for a Coffered Ceiling

As part of a yearlong renovation and addition project, the new owners of a 1920s Connecticut house wanted to upgrade an enclosed sun porch with a paint-grade coffered ceiling. Subcontracting for Fox Hill Builders of Darien, Conn., Hobart Builders of nearby Fairfield had to puzzle out the challenge of the concrete ceiling, which was neither flat nor level.

Hobart’s Joe Milicia had veteran carpenters Don Carlson and Bill Broome do the work. They started by snapping lines to establish the locations of the beams; then they screwed and glued 3-1⁄2-in.-wide strips of plywood to the lines. After using a laser to establish the perimeter blocking, they shimmed a second layer of plywood to level over the first. The idea was to establish a flat reference plane for the big beams and to work back toward the ceiling, rather than from the ceiling down.

After setting the perimeter, Don and Bill built the two large cross beams in place, then measured and built the smaller intermediate beams, each of which was installed in one piece. New drywall panels above the crown in each bay concealed the cosmetically challenged original ceiling. The takeaway here is not the job itself, but the ways that the carpenters approached and executed the various parts of it.

Build the long beams in place

Because the main beams were so long, the easiest way to install them and get tight joints at each end was to build them in place. A stringline stretched across the span became the reference for the beams, which in turn determined the rest of the room’s layout.

End block holds the shape. To establish the width for the bottom of the beam, the builders notched blocks on each end for the cleats and for nailing at the end of the beam. The sides were installed with a center scarf joint that later was concealed by crown. Carpenter’s glue, construction adhesive, and screws fastened the pieces.
Click to enlarge image
Click to enlarge image
One piece where it shows. Once the sides were in place, the bottom piece of the beam was measured and cut so that a seam wouldn’t be visible. Bar clamps held the sides tight until the bottom could be nailed off.

Trick of the Trade

Two ways to measure consistently and quickly
In a room that’s not square, flat, or parallel, all measurements are based on establishing a reference point (in this case, the large cross beams). Cleats, moldings, and intersecting members all need exact reveals, so the trick is to measure and mark without wasting time.

Fill in the short beams

Once the two cross beams were up, the next step was to build and install the smaller intermediate beams, followed by the drywall panels and crown.

Temporary blocks assist in assembly. The shallower intermediate beams were built on a bench. After using a spacer jig to position and fasten the cleats, Don clamped the sides to a spacer the same width as the bottom, then attached the bottom to the cleats with glue and nails. A 2° back cut across the face of the sides provided enough wiggle room for Don and Bill to slide the beam in place and still have the joint at the bottom remain tight.
Click to enlarge image
Click to enlarge image
Dual-purpose cleats. With the beams in place, the next step was to cover the ceiling with a fresh piece of drywall. Don and Bill used a perimeter of beveled cleats both to support the drywall above and to act as a backer for the crown molding below. Once one long cleat was in place, they applied dollops of construction adhesive on the back of the drywall, raised it in place, then installed the remaining cleats below the drywall.
Click to enlarge image
Click to enlarge image

Trick of the Trade

Five steps to a perfect copeInstalling crown is a task that can eat up your day if your techniques aren’t well honed. Bill has the process down to a science.

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After cutting the reverse miter, Bill used the miter saw to clip excess stock from the corner of the bevel, then clamped the piece to the work stand.
Cauls made from crown scraps prevented the clamps from marring the stock (they fit best when reversed) and kept them locked in place.
Starting with a coping saw, Bill cut the tighter curves of the profile.
He switched to a jigsaw for the broader cove, working in the opposite direction to avoid tearout.
He finished by hitting the edges of the cope with a piece of 100-grit sandpaper.
Finally, he snapped the molding in place.
Photos by Charles Bickford
From Fine Homebuilding221 , pp. 102-104
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