Things You'll Need:
- Chisel
- Miter saw
- Tape measure
- Trim
- Nail set
- Hammer
- Finish nail gun
- Wood filler
- Sandpaper
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Step 1
Tap a chisel behind the old trim around the door and pry the trim off. Use a strip of plywood between the prying tool and the finished walls to prevent damage.
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Step 2
After all the trim is removed, take out existing nails using a nail remover or hammer claw.
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Step 3
Using a tape measure, measure the length of the old trim to get the specifications for the new trim. Mark the length on the new trim with a pencil.
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Step 4
Most trim angles will be 45 degrees, so set your miter to this degree and lock it into place. If you aren't sure of the angle degree, use a speed square to confirm it.
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Step 5
Place the new trim on your miter table, and cut it with the saw.
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Step 6
Place the new trim around the door to check the measurements and to ensure that the cut angles fit correctly. For large gaps between angle cuts, use a hand plainer or electric sander to plane the angle so that ends butt tightly before nailing.
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Step 7
Using a hammer, stagger a brad nail every 16 inches along the trim. To reduce splitting, begin placing nails 3 inches into the trim, and stop 3 inches away from the end.
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Step 8
Place a nail set on the head of each nail, and tap with your hammer until the nail is sunk slightly under the face of the wood.
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Step 9
Fill nail holes and cracks between butted joints with wood filler.
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Step 10
Sand the dried wood filler product smooth with sandpaper in preparation for painting or staining.











