Lone Cowboy,
I was talking about the plywood one. They call it insulated because of the material you put in the top part that insulates it.
I didn't make myself clear in the previous post, sorry.
We did find that if you don't put a brace across, under the plywood top, it will sag after time, leaving space for the heat to escape & the chicks will get cold.
DH does make the legs 16 inches, all the way to the top for extra stability. We move these brooders around a lot and needed the added strength.
As the chicks grow, we put bricks or blocks of wood under the legs to raise it according to chick size and heat needs also.
Like I said, we have been using this style brooder for over 3 years, and they are wonderful. We have used similar plans before, but the 4 inch deep top covered with pine shavings or shredded paper made all difference in the world.
Jean