Asked on Jan 23, 2018
How to repair a hole left from the removal of old dryer vent.
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Avc27528829
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I want to remove the old dryer vent attachments, problem is that interior wall is drywall and exterior wall is concrete blocks and dept between 2 walls is approx
6 inches hole size is about 6 inches. interior attachment is round and exterior attachment is squared. please help.
Interior patch is fairly easy, remove the metal tube, place fibreglass insulation in the hole, cut a piece of drywall slightly smaller than the hole, put in hole, keep in place with mesh drywall tape, mud (probably need a couple of coats) the edges, sand smooth when dry and paint. I would assume the exterior hole would be treated similarly... would attach a concrete mesh over the hole and mix up a cement compound to go over the mesh, smoothing out with a trowel...I must confess that I have never patched concrete (yet).
After you patch the inside use expandable foam insulation to fill the void from the outside. Cut out the expanded foam level with the wall when dry. Patch with cement.
Check out Paul Ricalde on you tube. Excellent videos on repairs etc.
The outside can be done with mortar mix. Make it quite thick and build it up from the bottom about an inch at a time, just in from the outer wall. After it sets, put another layer on until the hole is closed. Don't do it all at once because the mortar mix shrinks a tiny bit, also it may sag out. The final "smooth" layer should be a little thinner for easier working. Fill the indented space and paint. Good luck.
' layer can be a little thinner for eaisier working
I would try to get a close match to the current brick, put it in the square as a filler and mortar it in...go forward as stated above...