How is cardboard used as a structural member??? how much strength it has compared to other materials used for construction?

Cardboard!!! For a roof!!! The support columns!!! Ehh I would not want to live in that house. Is this for a shack in Sri Lanka?

I do not know what specific structure you are referring to but I must say that the strength of a building depends a lot on it’s shape. When I was a kid, my dad cut some eggshells in half, taped the edges and put them on a table. Those eggshells supported an Oxford Dictionary and about 15 other books! Cardboard can also be very strong (and very cost effective) if used appropriately.

Your question is way too broad for a definitive answer. We would have to know the specifications for the project you are referring to.

Stronger than paper, not as strong as a brick?

@lapilofu Scissors cut cardboard!

I found a couple of good sources for you to check out: Building Composite Structures, 10 masterpieces of cardboard design and a book Cardboard in Architecture

I always enjoy seeing architects and industrial designers using innovative materials and especially natural, environmentally conscious ones.

I feel that cardboard can be strong enough to be used as building supports but it may not be very effective against weather. Bamboo and wood are good suggestions. Mud can be good insulation – check out those “refrigerators” that those African women use. They’re basically a big pot with a smaller pot inside and filled with mud in between.

A good use of cardboard would be for furniture. They provide very good support if used correctly and don’t have to be subjected to a lot of weather damage. Also, the chairs or tables or whatever can be recycled after they eventually wear down.