Abstract: A panel comprising a perimeter frame, a pair of skins spaced apart by the perimeter frame, and load distributing connecting members at the corners of the frame. The perimeter frame is formed from members having two oppositely directed channels so that when a pair of panels are positioned in a side by side relationship one channel of the perimeter frame of one panel will enter the other channel of the perimeter frame of the adjacent panel. The load distributing connecting members have a tongue to engage the inwardly facing channel of the perimeter frame. The invention also comprises a building having a floor, walls, ceiling, and roof wherein at least the walls are formed of panels according to the invention.