Hi GB, welcome aboard. Here's some info that might help with your decision-
the varroa mites can only jump up to 5/8", so if you place your screen bottom 3/4" above the solid bottom the mites will not be able to jump back up onto the bees.
the varroa mites can only jump up to 5/8", so if you place your screen bottom 3/4" above the solid bottom the mites will not be able to jump back up onto the bees.