How to do Crown Moulding
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Step 1: Determine Which Type of Crown Moulding to Use
Choose which type of style and wood you would like to use for your new project. To purchase hard wood mouldings click here. If you are on a budget you can use MDF mouldings, but do not use them in a kitchen or bathroom. The moisture may ruin the mouldings.
Step 2: Cut the Corners of the Moulding
The hardest part of installing crown moulding is cutting the corners. You can’t do it like any other trim pieces because the moulding sits at an angle between the wall and the ceiling (Image 1). Using a coping saw (Image 2) is the easiest way to cut the corners because a coped joint is tighter than a mitered joint. A coping saw is also good for a beginner. Any gap in a coped cut can be easily concealed with a little bit of caulk.
Another tool that will make the job easier is a power miter saw (Image 3). It’s accurate and makes a cleaner cut than a plastic miter box.
Step 3: Measure and Mark the Wall
Step 4: Cut the First Measured Piece
Step 5: Cut the Next Piece to Fit an Inside Corner
Move the miter saw guide to the 45-degree angle point and set the moulding into place. The edges need to be pressed firmly against the saw table and the vertical side fence. This is the first key to a straight cut and a good fit.
Step 6: Understand How the Pieces Fit Together
The second key is not so obvious and can be a bit confusing. The moulding is upside down, meaning the edge against the vertical fence is the bottom of the moulding and the edge against the table is the top of the moulding (think of your table as the ceiling).
Step 7: Cut the Moulding at a 45-Degree Angle
With the moulding in the proper position, use a 10-inch saw blade to cut a perfect 45-degree angle. It is also important here to make sure you cut the moulding angle in the right direction: for an inside corner, the bottom of the moulding should be longer than the top part of the moulding ; for an outside corner, the top of the moulding will be longer than the bottom.
Step 8: Cope the Joint
When you cope a joint, you scribe the end of one moulding to the face of the other. Darken the front edge with a pencil and then use the coping saw to cut as close to the line as you can. You need to hold your thumb against the side of the blade to guide the start of your cut. Start slowly, so you don’t splinter the delicate edge. Cut at a slight angle. You want to cut off more from the edge of the moulding and you don’t need to cut it all at one time. Cut out small pieces to make creating this coped joint easier.
Step 9: Check the Fit
Check the fit against a scrap piece of moulding to reveal any gaps that need to be trimmed. Use the coping saw to cut off the high points.
Step 10: Attach the Moulding to the Wall
Once the fit is right, take the moulding to the wall. For a long piece, you’ll need some help holding it. Push the end into the corner, making the fit as tight as possible; attach it to the wall. Use the caulk gun to cover up any gaps in the joint (make sure you’re using paintable caulk). You may need another small piece of moulding to finish out the wall.
Step 11: Make Miter Cuts for the Outside Corners
The outside corners should meet exactly (a caulk gun can’t help you much here). Less experienced DIYers may want to paint the crown moulding , since paint and caulking can be used to hide any small mistakes — with stained moulding , it’s much harder to disguise imperfections.
Step 12: Use Optional Corner Blocks
You can skip the miter and coping cuts altogether by using corner blocks, which will prevent having to cut angles into the moulding . It looks professional and tends to be a lot easier.
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