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Old 12-27-2012, 12:38 PM   #1
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Doing mitre cuts on plastic window sils


Hi im currently putting in new window sils at home but i have done side with the mitre but i cant get the other mitre to match up ,iv cut the sil to match the mitre that i have put in but its too big in depth and iv tried cutting it down off the depth but its not working can anyone help

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Old 12-27-2012, 12:48 PM   #2
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Doing mitre cuts on plastic window sils


Have you checked your saw for a perfect 90 from the blade to the fence?

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Old 12-27-2012, 03:16 PM   #3
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Doing mitre cuts on plastic window sils


Problems with miter cuts are usually related to improperly adjusted saw (see oh'mike comment), or improper measurement of the required miter angles. Not all corners are 90 degrees, you need to measure very carefully first, or make some test cuts and adjust.
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Old 12-27-2012, 03:20 PM   #4
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Doing mitre cuts on plastic window sils


Is this the stool or the sill your cutting? The stool in inside the sill is outside.
Try to figure why you would be using plastic on an inside stool and not wood.
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Old 12-27-2012, 05:12 PM   #5
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Doing mitre cuts on plastic window sils


maybe using azec so htey dont have to deal with condensation ruining the paint finish
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Old 12-30-2012, 08:27 AM   #6
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Doing mitre cuts on plastic window sils


It also depends on how the trim sits on the window jamb and the wall. You may have to fit the miter first, may have to shim behind the meeting miters, then caulk the space the best you can.
I assume you checked for square saw blade, same size trim, jamb corners that meet flat, wall board with too much compound, plaster, etc.
Homedepot trim can have slight differences in size from one piece to another, even within one piece.

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