Ralph builds huts in order to shield themselves from rainfall, similar the rainfall they experienced on the day they supposedly arrived on the island.
In addition, the huts provide phsycological comfort for the Littluns as well as some of the Biguns from the superficial "Beast".
Ralph believes having shelter provides security and protection from the elements. It also serves as a central gathering place for the group, fostering a sense of community and organization. Additionally, shelter can offer a sense of normalcy and civilization in the face of uncertainty on the island.
because they need shelter to keep them warm and safe
Ralph wants to get those boys back to his side by reminding them he has shelters which offers security and protection.
Ralph believes they need shelter because it offers protection from the elements and can help them feel safe and secure. Having a designated shelter can also provide a sense of order and organization within the group.
Built shelter.
Actually there was no important job. Both were important but shelters was agreed more because they had edible food near them while building shelters was more important because they had a thought about ghosts and strong storms.
He thinks they shoulder make shelter.
Shelter is important because it keeps you warm, dry and safe. You shelter because you would die without it.
No one else is helping them.
he finds them bulding shelter
Ralph witnessed a shelter catching fire and felt the heat on his shoulder as flames flickered close to him. This frightening experience likely intensified his sense of urgency and danger on the island.
To make a more permanent shelter, and organize food gathering.
he doesn't, Jack does
bad
Jack sees that it is more vital to hunt, rather than build important huts for shelter at night like Ralph does. The littlnuns are concerned about shelter at this point in the book, but Jack is to headstrong to realize this, and too obsessed with "death", and "killing", and the hunt for blood.