# How to cut fiberglass shower for fixtures? **URL:** \ **Category:** Factual Questions\ **Created:** [March 1, 2010, 6:21pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890 "2010-03-01T18:21:08Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Harmonious\_Discord](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Harmonious\_Discord](https://boards.straightdope.com/u/Harmonious_Discord)\ **Post date:** [March 1, 2010, 6:21pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/1 "2010-03-01T18:21:08Z")
A new fiberglass shower is being put in. How do we cut the holes for the plumbing fixtures without damaging the fiberglass. ---
**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\ **Post date:** [March 1, 2010, 6:25pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/2 "2010-03-01T18:25:37Z")
[Grit-edged hole saw.](http://www.lenoxsaw.com/enUS/Product/MASTER-GRIT_HOLE_SAWS.html) ---
**Author:** ![Harmonious\_Discord](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Harmonious\_Discord](https://boards.straightdope.com/u/Harmonious_Discord)\ **Post date:** [March 1, 2010, 6:46pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/3 "2010-03-01T18:46:31Z")
Is this the only thing that works? We own the regular non abrasive hole saws. We’d have to get two different sized bits which would run a lot of money. The holes don’t have to have a perfect smooth edge. We just need to be sure that what we do doesn’t make a giant crack. We can back the fiberglass with a block of wood for cutting purposes. ---
**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\ **Post date:** [March 1, 2010, 6:51pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/4 "2010-03-01T18:51:26Z")
A regular hole saw will work, but it will dull the blade, and maybe ruin it in short order. I don’t think you are going to crack fiberglass - it’s a woven material and very, very tough. ---
**Author:** ![PlainJain](https://avatars.discourse-cdn.com/v4/letter/p/5daacb/32.png) [@PlainJain](https://boards.straightdope.com/u/PlainJain)\ **Post date:** [March 1, 2010, 6:52pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/5 "2010-03-01T18:52:42Z")
I doubt it will crack either. Try[asking here](http://www.terrylove.com/forums/forumdisplay.php?6-Plumbing-Forum-discussions) instead. ---
**Author:** ![Harmonious\_Discord](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Harmonious\_Discord](https://boards.straightdope.com/u/Harmonious_Discord)\ **Post date:** [March 1, 2010, 7:41pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/6 "2010-03-01T19:41:19Z")
It looks like we’ll try the hole saws we have. Thanks. ---
**Author:** ![Harmonious\_Discord](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@Harmonious\_Discord](https://boards.straightdope.com/u/Harmonious_Discord)\ **Post date:** [March 1, 2010, 8:35pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/7 "2010-03-01T20:35:33Z")
It worked. ---
**Author:** ![crazyjoe](https://avatars.discourse-cdn.com/v4/letter/c/f14d63/32.png) [@crazyjoe](https://boards.straightdope.com/u/crazyjoe)\ **Post date:** [March 1, 2010, 10:41pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/8 "2010-03-01T22:41:56Z")
Awesome. One trick is to cover the area you will be sawing with masking tape. It seems to help preventing problems with drilling/cutting into a lot of surfaces. ---
**Author:** ![Khendrask](https://avatars.discourse-cdn.com/v4/letter/k/3e96dc/32.png) [@Khendrask](https://boards.straightdope.com/u/Khendrask)\ **Post date:** [March 2, 2010, 1:49pm UTC](https://boards.straightdope.com/t/how-to-cut-fiberglass-shower-for-fixtures/530890/9 "2010-03-02T13:49:13Z")
For future reference, you can also use a RotoZip tool on light fiberglass, but it is pretty much of a pain.