GregT
In the Brooder
hello .. I would use 1x2' (rip them down yr-self if you don't have any from 2x4' or any other kind of wood .. and trim it out where the gaps are .. u could use drywall screws (good enough) .. for the roof part where it is wavy use 1x3 on the inside, stuff it with torn pieces of cloth then put a board on the outside (trim) to kinda hold it in .. cheap way to do it .. will work / short of getting those special made contour rubber things that match the waves in the metal roof .. also i would put some on the nest boxes as well, there looks to be some draft issues there .. it will seal it as well as straighten up some of the warping ..