Polyurethane Crown Moulding and Trim Installation
Polyurethane mouldings may be installed much the same way you would install wood mouldings.
For a better fit, it is advised that a flat or “Butt Joint” is used to join longer lengths of polyurethane mouldings. Cut all pieces 1/8th of an inch longer than the required measurement, fitting the ends in place first and the middle sections last.
Always place a continuous bead of premium polyurethane adhesive along all adjoining wall and ceiling surfaces before final positioning of the moulding. Poly-glue is essential when attaching one length of moulding to the next. A pneumatic pin nailer works well for fastening polyurethane mouldings to wall and ceiling surfaces; alternatively, trim head drywall screws or finishing nails may be used.
Corner Blocks
Corner or center blocks may be used to avoid difficult or challenging mitre cuts. When using corner or adjoining center blocks, be sure to mount the blocks to the wall and ceiling prior to measuring and cutting moulding lengths.
Filling and Sanding
Once all of the mouldings are fixed in place, fill any joints or remaining voids with a paintable siliconized latex caulking. This same caulking may be applied sparingly along the top and bottom edges of the moulding where it meets the ceiling and wall. A damp cloth or silicone coving tool may be used to clear away any excess caulking to leave a clean professional look.
Any remaining nail or screw holes may be filled with sandable, paintable non-shrinking filler. Be careful not to over sand the surfaces of your polyurethane mouldings. Sanding past the protective barrier undercoating may necessitate further filling and sanding to maintain a paintable surface.
Ceiling Medallions
Place a solid bead of premium adhesive around and about the backside of the medallion. Pressing the medallion into place, it may then be secured with 4 trim head dry wall screws. Be sure to place the screws so that any holes created may be filled and sanded with minimal effort.
Wall Niches
Some surface mount wall niches may be hung temporarily using attached hardware or permanently using the same applicator procedures as for Ceiling Medallions. Other niches available come complete with their own template and installation instructions.
