Glass block window method?

we want to install an exterior glass block window (6' x 4'). This will be made of Pittsburg Corning 8" glass blocks. The company's website and pamphlets give various methods of installation but doesn't say which system is best if the window is within the size limit for more than one method.

question: Is there some benefit of a mortar system over a channel and silicone system? The company doesn't give the pros or cons for a the size of a window I want to construct. The channel system appears relatively easy to install and I'm leaning that way over mortar. Is there a drawback? This won't be a weight bearing window as it will be framed within an existing small garage door opening.

Any advice appreciated. Thanks

 

The channel/silicone system is a snap. I did a 32"x32" opening in less than 35 minutes. Of course I framed and cased the opening to meet the exact requirements of the block courses. The directions are clear and it looked really good. Corning didn't extol the virtues of either system because they sell both. At the big box where I picked mine up, they had flyers with block layout systems and instructions for installation, as well as rough opening sizes.

 

Thanks. I checked out the company's website and they have good instructions.

question: Are 'both' sides of these blocks grouted or silicone sealed or just one?... and is there a need to use the company's silicone? I'm going to need quite a few tubes (they are expensive) and wonder if any quality brand is ok to use.

 

You have to grout/silicone both sides.

"Quality brand" means nothing. You need the right TYPE.

Pittsburg Corning probably does not make the grout/silicone. The probably buy it and have it packaged with their label. They do not do it for profit, but as a convenience to make sure it is available for liability protection. If the proper materials are not available, they could not sel their "system" which has been around for a long time.

Someone else makes the same thing. Read labels closely to compare and start with the higher end of the brands types.

Buy or write down the information on one tube of the official grout/silcone. Check out ingredients, application methods, timing, protection and any of the impressive looking standards like ASTM, ANSI, etc. These are generic standards that P-C may use when they buy their grout. Also look for any warnings. Buy the grout that has the best match and color and you should be OK.

Dick