I was hoping to purchase fiberglass doors … Fiberglass Power Trimmer. most 80" doors only measure 79-1/4" to 79-1/2". 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. 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. Trimming the door may require reducing the door’s width, a job you can do yourself and therefore save the money it would take to hire a professional. This will ensure that the cut is perfectly square. In an effort to illustrate this, we’ve 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 we’ve 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 … With these all being wood I simply cut off the difference at the bottom of the door and frame to make them fit. If you cut material away from the doorknob side, it will change the backset (the distance from the doorknob to the edge). A stained door frame would be hard to match colors. 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. I am no ready to replace my entry doors and of course they only have 80 inch openings as well. Doorway height is limited by the porch roof on the outside so I cant gut and cut to make the new doorframe fit. Make sure that the blade is set square. 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". Also, delamination—the skin peeling away from the frame—can occur with doors that have wood stiles and rails, which will absorb water and rot if not kept sealed with paint or varnish. These are in a high water exposure location. Cut through the fiberglass door and masking tape, using a fine-tooth jigsaw blade. 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 The door has got to be really stable and solid on whatever your laying it on. A trimmer is lightweight and powerful, and it easily cuts through hard fiberglass, such as that used in paneling. Dennis (cut2it) Jigsaw. You can use a jigsaw to cut the fiberglass paneling if you use a blade made for cutting … chances are, if the door were decent quality, it would have had a wooden rail across the top, between the fiberglass skins. This will make the cutting easier to cut along the line you drew. 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. 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. 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. A helper wouldn't be too bad of an idea. 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. but aside from that, you probably will have problems with the exposed foam. 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