i need to fill out a window and have had boxes of glass block laying around but never knew how to install—-would the easiest way for a small opening be to just mortar them in instead of trying to find those spacers—i am no mason but have done much patchwork so i know i can handle—any experts give me some pointers so i can get this job out of the way??—-if the block come up short at top should i just fill with lumber or fill at bottom and then mortar top??—-what type of mix???
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To Don,
I would recommend that you calculate the amount of space to fill in the window because of the fact I have never seen anyone cut glass block. There are different sizes available to accommodate various widths of openings... allthough you may not be able to match patterns or texture. There are caulks that are available to set glass block, but I would reccomend using a glass block mortar formulated for this type of installation. Depending on the size of your opening you can only stack the block a few rows high.... too many and the mortar starts to push out of the joints. Patience with this type of installation is the key to success.
The thing to remember with glass block is that it's a rigid material, so when installing it against a wood surface there has to be a flexible bond, usually up the sides and over the top.
It might be worth your time to visit a supplier or search for the USG website. They have some little instruction manuals/pamphlets that spell the installation steps out very clearly which could save you a lot of grief. Glass block can be a little tricky to do, but, if you take your time with the proper materials and methods, it's very doable by the inexperienced.
Don't discount the value of using spacers and you might want to consider reinforcement if if you have several courses. They make a special lattice that lays between courses, kind of minuature version of what is sometimes used in concrete block walls. You will also need the metal attachment clips that secure the glass block assembly to the frame.
Post a picture when you're done, please!
Jules Quaver for President 2004
Edited 2/4/2003 9:48:31 AM ET by Notchman