Try rigid expanded sheets 4x8 sheets (Styrofoam). Easy to cut and fit and comes in different thickness. I use it on my sliding barn doors. It is cut to fit between the 2x 4 frame. Inch and a half thick.
From a hilltop in Douglas County.
Hey folks I'm new to the forum two months ago, but just now getting things together with time to post. Great site for info.
Raised around farm equipment big and little stuff. Got away from it for awhile, now I'm back in it. Great!!!