Both glass and plastic blocks now have high-efficiency features of regular windows. For example, low-emissivity coatings are deposited on the inside surface of the block before it is fused together.

The blocks are made without additives or fillers — 22 pounds of plastic create 22 pounds of ByBlock bricks. ByFusion's Blocker System shreds plastic waste and compresses it in minutes into blocks.

After years of R&D, startup ByFusion is processing 450 tons of plastic a year—with the goal of reaching 100 million tons by 2030.

Dear Jim: I am concerned about the security and efficiency of some of my old single-pane first-floor windows. I think glass block windows would be more secure. Are they efficient and can I install … ...

Like LEGO blocks, these interlocking structures don’t need adhesive to be strong and sturdy, which makes them a good option for mobile shelters. And yes, the plastic mix will eventually ...

The following companies offer glass- and plastic-block windows: • Builders Accessories, 1-888-921-7086, www.acrylic block.com • Circle Redmont, 1-800-358-3888, www.circle ...

The blocks are made without additives or fillers — 22 pounds of plastic create 22 pounds of ByBlock bricks. ByFusion's Blocker System shreds plastic waste and compresses it in minutes into blocks.