Shim gauge - Fine Homebuilding
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Shim gauge

comments (1) January 31st, 2011 in Project Gallery
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Photo: Drawing by Chuck Miller

In home building, square, level, and plumb are admirable goals, but we sometimes fall a little short of the ideal. As a consequence, we turn to shims. They are vital for adjusting the fit of prehung doors, banks of cabinets, and custom built-ins, or for just about any other finish-carpentry task. Traditional tapered shims are nice because they can be adjusted incrementally to ensure a perfectly plumb or level installation. To me, though, this benefit is also their downfall. Because the face of the shim is tapered, the object I’m adjusting ultimately is resting on only a sliver of the shim, rather than bearing on its full surface.

To remedy this problem, I filched an old stairbuilder’s trick by making a gauge to measure the size of the gap I’m trying to fill. As shown in the drawing, I cut a scrap of wood into the shape of a thick shim. Then I marked the points on the shim where it diminished in size by 1/16 in. with numbers and contrasting bands of color so that they are identified easily.

Now I can slide my shim gauge between a door jamb and a king stud until the prehung unit is plumb, look at the depth indicated on the gauge, and rip a flat-face piece of stock to the exact thickness I need.


Justin Fink, Glastonbury, CT 
From Fine Homebuilding 185, pp. 30

 


posted in: Project Gallery, windows, doors

Comments (1)

lindalan lindalan writes: Geez, How long does it take you to hang a door?!

Yes, shims are tapered. Thats why carpenters use one from each side.

I generally use about 6 shims per jamb plus 2 or 3 for the head. If you're sawing 14 or more shims, of which many or most are different, you're adding a lot of time to a 20 minute job.
Posted: 6:16 pm on March 22nd

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