Glass Block Window Mortar

[DKAudio]

I just installed a glass block window in my downstairs bathroom. I got one of the premade ones at the big box store with a vent in the middle. I am just wondering if I need to paint or put silicone over the mortar on the sides and bottom of the window or if I can just leave it exposed?

[HayZee518]

glass block

I just checked two sites dealing with glass blocks. if the joints are smoothed using a caulking tool they didn't mention sealing the joints.
I suppose the same would be true with common bricks. the joints aren't sealed so I guess the blocks would be treated the same. ask pushkins.

[pushkins]

If you used mortar to set the window on all four sides then your good to go unless there is a steel lintel on the top, then you should add a good bead of silicone as the expansion and contraction differences between mortar and steel are dramatic.

[DKAudio]

Thanks, I used mortar on the sides and bottom. On the top I filled about a 1/2" gap with expanding foam. The top of the window is out of sight above the starter strip of my siding so it will not get exposed to UV or water.