How would those "bricks" be used? Petg (plastic for bottles) tends to do pretty badly in sunlight.
I guess that depends on the user. I'd imagine they'd be best used in place of breeze blocks (similar weight/density). Breeze blocks are usually covered in plaster, another layer of bricks or not in sunlight.
@Stonehedge started
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How would those "bricks" be used? Petg (plastic for bottles) tends to do pretty badly in sunlight.