I just noticed a major leak in one of my windows last weekend during a heavy rainstorm. Upon inspection, I found several gaps in the caulking that I think the water is getting through. I managed to get a tarp over the window for a quick fix, but I'd like to caulk as soon as possible.
How long do I need to let the window dry out before scraping the old caulk off and reapplying? I don't want to trap any excess moisture and end up with mold problems, but the longest stretch this week without rain forecasted is only two days. Is that long enough for everything to dry out? My home exterior surrounding the window is brick.
Best Answer
Alternative 1: Cut out the old caulk. Then take a heat gun, or if you don't have one, a hair dryer, and blow into the crack to speed up the evaporation. Use your judgement about how long to do this. Make sure you don't heat any adjoining cold glass or it may crack. You can shield glass with a wide bladed spackling knife, or ever a board. You could also set a fan up on something and let it blow several hours. To make sure the crevice is dry, take some toilet tissue and force it as far down in the crack as you can. Then pry it back out. If it comes out dry, caulk.
Alternative 2: Cut out the old caulk and let it air dry. Whenever rain is forecast, use duct tape to completely cover the area. After the rain finishes, uncover. If rain is forecast while you're waiting, reapply duct tape. After a week of air drying it should be dry. Then caulk.