CMU is a prefabricated construction material made from cement, aggregates, and water. Available in standard sizes (8-12 inches width, 4-16 inches height). Combines strength, durability, fire resistance, and thermal insulation
Everyday standard expansion anchor for uncracked concrete. Available in five versions: HSA, HSA-F, HSA-R, HSA-R2, HSA-BW. Features fast setting and reliable torqueing with impact wrench
Steel gratings are made of carbon, aluminum or stainless steel. Available in four main types: welded, press lock, swage locked and riveted. Features high strength, load capacity and resistance to deformation
Straight-run stairs are simplest form, limited to 12 feet height. L-shaped stairs can be with landing, winders, or offset winders. U-shaped stairs work best in small spaces. Spiral stairs are common but not allowed in codes. Curved stairs can meet code requirements if center diameter large enough
Derives from Middle English "screde" meaning fragment or scrap. Comes from Old English "sċrēad" meaning piece cut off. Connects to Proto-Germanic *skraudō and Proto-Indo-European *(s)ker-
Tree houses were built by great apes as ground shelter. Early humans may have lived in trees until about 40,000 years ago. Indigenous people build tree houses for protection in tropical regions