Step 5 Drill a hole in the fiberglass first if you need to cut a shape in the door for a cat or dog door. Tape the bottom area (top side) with masking tape where you will be cutting. https://www.thisiscarpentry.com/2013/04/05/cutting-plugging-fiberglass-doors This will ensure that the cut is perfectly square. Fiberglass Power Trimmer. Cut through the fiberglass door and masking tape, using a fine-tooth jigsaw blade. I'm replacing doors on a concrete pump house at the community pool. A stained door frame would be hard to match colors. A trimmer is lightweight and powerful, and it easily cuts through hard fiberglass, such as that used in paneling. Lastly don't cut too slow as fiberglass heats up faster than wood and could melt some of the cuttings that could clog your cutting. However, the current doorway is on the original part of the old house and is not standard height, I needed to cut down the door to 77-5/8". Installing a door may seem like a straightforward process, but if the door does not fit precisely into the door frame, then a little extra work may be involved. These are in a high water exposure location. but aside from that, you probably will have problems with the exposed foam. With these all being wood I simply cut off the difference at the bottom of the door and frame to make them fit. For that small amount, I'd be tempted to cut 1/8"-1/4" off the top of the door and cut new hinge mortises in the door frame to move the door and hinges up that amount. A helper wouldn't be too bad of an idea. I was hoping to purchase fiberglass doors ⦠You can use a jigsaw to cut the fiberglass paneling if you use a blade made for cutting ⦠If you cut material away from the doorknob side, it will change the backset (the distance from the doorknob to the edge). I want to use fiberglass doors, but I'm going to need to be able to trim width and height of the doors to fit the settled steel door frames tat are there. This will make the cutting easier to cut along the line you drew. Also, delaminationâthe skin peeling away from the frameâcan occur with doors that have wood stiles and rails, which will absorb water and rot if not kept sealed with paint or varnish. chances are, if the door were decent quality, it would have had a wooden rail across the top, between the fiberglass skins. Make sure that the blade is set square. When cutting the width of the door, cut it on the hinge side. https://homeguides.sfgate.com/cut-fiberglass-door-24051.html Doorway height is limited by the porch roof on the outside so I cant gut and cut to make the new doorframe fit. Jigsaw. most 80" doors only measure 79-1/4" to 79-1/2". did you try to fit the door into the rough opening before cutting it? So cutting it down seemed to be the way to go. In an effort to illustrate this, weâve embarked on a mission to shed some pounds from our 275 radial tire project car known as BlownZ, with the installation of a set of fiberglass doors to replace the bloated factory doors weâve been lugging down the quarter-mile for the last two seasons.In May, we cranked off our first seven-second pass with a 7.69 in Pomona, which ⦠The door has got to be really stable and solid on whatever your laying it on. Trimming the door may require reducing the doorâs width, a job you can do yourself and therefore save the money it would take to hire a professional. Plus, you can choose between 3-, 4-, and 5-inch trimmers. You'd have to patch in a little where your hinges used to sit, which would be easy to hide if the door frame is painted. Dennis (cut2it) A fiberglass door won't dent, but the skin can crack if it takes a hard hit from an errant golf ball or gets banged up during the delivery of your new range. 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