(NovaCrown is also available in high-grade factory-sprayed white paint)
Measure each wall span and mark the required length on the piece of NovaCrown. Take care to measure and cut accurately as NovaCrown has a degree of resilience which allows adjoining pieces to compress slightly so each joint fits tight and neat every time.
NovaCrown is available in 12' and 14' lengths. If walls are over 14' long and will have a mid-wall joint, it's important to plan the positioning of the joints. Always position any such joint keeping in mind the sight-line of the primary traffic flow along each such wall. Where possible, locate the mid-wall joint furthest from the sight-line. Looking at the mid-wall joint from the main line of sight, the overlap, or top half of the bevel joint, should be positioned closest to the main line of sight so even the slightest appearance of a joint will be minimized.
The cut can be made with a power chop saw, a fine-tooth saw, a long-bladed utility knife, or a drywall saw. An additional option is a hacksaw with the blade turned upside down and this toothless edge sharpened. When the lengths are cut so adjoining pieces fit snuggly against each other, but not so tight that they push away from the wall, a crack-free joint filled with a narrow bead of latex caulk is achieved. Ensure the cutting tool is always sharp and clean. A rag sprayed lightly with WD-40 is handy for removing any polystyrene build-up.
Use a sharp knife to remove the fuzziness and a sliver of the NovaCrown on the back side of each cut. This will ensure there is not an excess buildup of paper on the back edge of a joint. A paper buildup could wick up extra moisture from the joint compound and cause the joint to protrude from a true line when dry. This same result can be created with corner joints by cutting them at 46 degrees instead of 45 degrees, if using a power chop saw.
Before applying adhesive, test each wall and ceiling section for level with its piece of NovaCrown. If the ceiling has a slight downward bulge, put the piece of NovaCrown in its place on the ceiling and mark where the bulge occurs. Then cut out just enough of the top/back ceiling contact surface of the NovaCrown until it will lay flat, taking care not to cut away any of the ceiling reveal edge.
If the wall bulges inward, do the same to the bottom/back of the wall contact surface. If there is a noticeable depression in the ceiling or wall, this should first be made level by the drywall contractor.
Apply drywall taping compound or a bead of paintable latex caulk to the two back edges of the NovaCrown. For crack-free results, use paintable white latex caulk for all corner and mid-wall joints. The caulk must be paintable so the joint won't flash through after priming and painting. The caulk must be latex or water-based so it will not cause degradation of the polystyrene core.
Place the first piece on the wall, gently rocking it in place in the ceiling angle until it feels right. The rest of the pieces in the room should be positioned to follow the alignment of this piece.
Remove any taping compound or latex caulk squeeze-out along the wall and ceiling edge with a narrow drywall knife, your finger, or a moist sponge, filling any minor gaps in the process. After it has set, if necessary, apply a small bead of latex caulk to fill any remaining gaps at the joints and smooth again.
The NovaCrown is now ready to be primed at the same time as the ceiling and wall. No holes or edge gaps need to be filled by the painter. Avoid buildup of paint along pieces of cornice and in joints. If the ceiling is to be textured, the NovaCrown and wall must be masked.