Outside closures are recommended under many trim items to produce a more weather-tight structure and deter insects, birds, and other pests from entering your structure. Outside closure rests on top of the panel but under the trim item to seal the opening created by the rib configuration. It is commonly used under the ridge cap, endwall and sidewall flashings, as well as on top of the transition flashing. These closure strips are produced to match the configuration of your specific panel.