Final answer:
A layer of insulation is added to the exterior walls to weatherproof a house. This insulation is then covered with siding for added protection.
Step-by-step explanation:
To begin weatherproofing a house, a layer of insulation is typically added to the exterior walls to prevent heat loss or gain. This insulation can be in the form of fiberglass batts or foam boards. Once the insulation is in place, an additional layer called siding is added to protect the insulation and give the house an aesthetically pleasing exterior.