Glass Block Window Install - Windows and Doors - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Windows and Doors


Thread Tools Display Modes
Old 10-03-2011, 07:29 PM   #1
Join Date: Oct 2011
Location: Twin Cities, MN
Posts: 100
Rewards Points: 77

Glass Block Window Install

Greetings....long time lurker, first time poster.

We're re-orienting a bathroom, and part of that is moving the tub against an exterior wall. There's currently an awning window (36" x 21"), but we're going to remove it and put in glass block (32" x 16") so we still have some natural light source (can't do a skylight/tube). I've searched quite a bit for different install suggestions, specifically when it comes to waterproofing around the frame, and based on all my searching, here's what I'm thinking so far:

-Once the window is removed, use 2x4 to reduce the size of the rough opening.
-Install Hardibacker on the walls and in the opening
-Mud and tape joints, then Redguard
-Install tracks/rails for the glass block, then of course put in the block
-Generously seal with Silicone

We're doing a tile surround that will at least go up to the height of the window...bullnose when we get to the edge of the glass block.

So my I on the right track? What am I forgetting?


dvaupel is offline   Reply With Quote
Old 10-03-2011, 07:43 PM   #2
kwikfishron's Avatar
Join Date: Mar 2010
Location: Kansas City
Posts: 9,017
Rewards Points: 234

Glass Block Window Install

Welcome to the forum.

Have you considered a acrylic block window?


A Picture Is Worth A Thousand Words
Especially In The DIY Chatroom
kwikfishron is online now   Reply With Quote
Old 10-03-2011, 09:41 PM   #3
Join Date: Oct 2011
Location: Twin Cities, MN
Posts: 100
Rewards Points: 77

Glass Block Window Install

we have considered those, but we can get a thicker window (that almost matches the depth of the frame) using single block construction. Then there's no sill to deal with. Also, the cost is a bit lower and hopefully it's a bit more insulated.
dvaupel is offline   Reply With Quote
Old 10-03-2011, 11:13 PM   #4
Bud Cline's Avatar
Join Date: Mar 2006
Posts: 10,702
Rewards Points: 3,052

Glass Block Window Install

Your plan will work fine. Be sure to use "glass block mortar" for the install, nothing else. Except if it is the kit thing then 100% silicone is used but it can make a helluva mess of things. It will take three or four coats of Redgard to accomplish the waterproofing. My last one I used KERDI Mat for the waterproofing but I have it on hand all the time.

I would set the blocks flush with the wallboard surface so that the window/glass block can be trimmed with bullnose tiles all around thereby framing the window and giving it a finished look at the same time. The outside can be fitted any way it will work but should have a flashing tucked slightly under the glass block. The interior fit is the important one. Once the tile is installed and grouted the bullnose can be caulked to the block using acrylic or siliconized caulk and finished perfectly with a wet sponge. I would never use 100% silicone.

Last edited by Bud Cline; 10-03-2011 at 11:16 PM.
Bud Cline is offline   Reply With Quote

bathroom , glass block , shower

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Weight of Glass Block Window jonathan03 Remodeling 2 06-23-2010 12:21 PM
glass block vent removal and installation JMuhammad General DIY Discussions 1 09-10-2009 07:29 PM
Impact Windows & French Doors Matty16 Carpentry 6 06-22-2009 10:01 PM
Window Install? sod Building & Construction 3 10-26-2008 08:02 AM
Sweating windows big daddy-o General DIY Discussions 15 01-06-2008 03:41 PM

Top of Page | View New Posts