Imperial sizing is ¼” smaller than the nominal size listed. Metric size block are actually measured in millimeters and are usually smaller than the Imperial size blocks.
Actual size denotes the measurement of the block by itself where as nominal size denotes the block size with a ¼” mortar joint.
All glass blocks are not load bearing. A lentil or header must be used in an opening to support the wall material above the glass block.
In stock orders typically ship in 1-2 business days from time of order to ship.
We have no minimum order at Quality Glass Block. Order what you need.