Door Threshold / September 15, 2018 / Leala Melanson
But what about retrofitting a new entry door system in an older home built with cinderblock masonry walls? You cant use the same technique of just nailing through the jambs the masonry will just deflect and bend a regular framing nail. Cut nails might possibly work but the chances for jambs alignment adjustments are slim to zero while the chances of masonry cracks or half-moon hammer head marks in the jambs are almost a given. Masonry screws need to be started in pre-drilled cinderblock holes which can be drilled through the jamb but Ive never been satisfied with their holding power alone where the cinderblock is prone to crumble around the holes while adjusting screws and snugging shims tight. Experience has taught me to always insert plastic expansion sleeves in the cinderblock to properly fasten masonry screws.
They are known to flake and chip when exposed to sunlight and are often cited for creating more work than the protection provided. These low quality 2 or 3 mil. tapes often leave a sticky adhesive residue on thresholds as the adhesive used in the tapes softens in warm temperatures. Another option is to use fitted threshold protection made from molded plastic. The molded plastic threshold protectors are designed to protect the most common types of thresholds in residential or commercial construction. They are the most durable type of threshold protection and can be used for multiple projects.
I believe installation direct to masonry is the height of challenge for an entry door where skills and patience for a carpenter are truly tested. You really only have one chance to get it right - screw hole mistakes in the cinderblock dont allow for incremental jambs adjustments. Here is where carpentry meets art you must think and be creative. So the satisfaction of a properly installed door in this case becomes at least for me a real thrill. On the initial site visit to measure up the door youre going to tap on the walls to see if they are drywall or plaster.