I joist

i joists are a type of beam used in construction projects. They are long and thin pieces of wood that fit together to form a strong structure. They are much lighter than traditional timber joists and can be used in places where traditional joists wouldn't fit. They're also easier to install and require fewer nails and screws, which can save time and money. They work like a LEGO set: each piece has grooves in them so you can slot them together. When you put them together, they make a strong structure that can support whatever you need it to support.