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Old 02-09-2011, 09:17 AM   #1
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Need a bigger hole in fiberglass..


i am replacing the fixtures in my shower/tub. The hole in the fiberglass for the water connections is 3 inches in diameter and the replacement needs 4 3/4. What is the best thing to cut this with???

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Old 02-09-2011, 09:22 AM   #2
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Need a bigger hole in fiberglass..


a hole saw. glue a 1x piece of wood to the back of the unit right at the hole. let it sit until cured, find the center of your new hole and drill slowly with the hole saw. make sure the new hole is smaller than the trim plate though

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Old 02-09-2011, 01:38 PM   #3
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Need a bigger hole in fiberglass..


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Originally Posted by the_man View Post
a hole saw. glue a 1x piece of wood to the back of the unit right at the hole. let it sit until cured, find the center of your new hole and drill slowly with the hole saw. make sure the new hole is smaller than the trim plate though
IMO. DIY would be a lot safer using a roto-zip or such with one of the specialty rasp looking bits in it; keep bit projection to a minimum.
Whatever you use, mask a very generous area around the site with several thickness of duct tape to protect the surface.

Hole saw will certainly work, but 4 3/4" is a bear for someone not used to working with large diameters. Most likely scenario is that it will grab and leave a trail of teeth marks across the fiberglass.

Another safer option is a rotary rasp chucked in a drill. Gonna take longer, but much more controllable than monster hole saw.

Helpful to have a fan blowing out of a window if possible, and someone guiding the nozzle of a shop vac near the cut to collect as much irritating fiberglass dust as possible.
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