How to Vent a Glass Block Window

Step 1

Measure the size of the vent to see how many glass blocks you’ll need to remove to install it.

Step 2

Cut into the mortar around the glass blocks, using a razor or knife. If this doesn’t work, use a drill with a masonry bit to drill through the mortar. Break apart as much as possible of the mortar that surrounds the blocks to remove them.

Step 3

Pull out the blocks and set them aside. Vacuum any dust and debris from the mortar removal.

Step 4

Apply a ¼-inch line of mortar around the vent with a trowel and slip it into place between the blocks. Wipe off any excess mortar from the window with a damp cloth. Allow it to dry for 24 hours.

Step 5

Apply a line of caulk around the vent to keep it airtight.