The trick with the Lowe's insulation is to hold down the vunerable edges with narrow strips of aluminum pop-riveted to the footbox.
If you want to get fancy with waffle pattern stainless steel, try S.L. Sales (714-662-7704). They've got separate insulation material and .005" stainless. Total cost around $150.
This is how it looks when we use it in our GT. We roll the edges over.
