Not all damage is obvious and some hidden damage can go unchecked. Roofing material should not sustain damage but it needs to be inspected. Shingles that have been heat damaged can be crushed and pulled loose as a result of the additional weight of the snow and ice. Gutters and downspouts can pull loose, swell, and burst from freezing water. Moisture in the walls gets trapped between the exterior plywood sheathing and interior vapor barrier causing smelly and rotting wall cavities.
Insulation is one of the building materials damaged by hidden leaks.
Insulation absorbs water very quickly and should be removed to prevent additional damage to sheetrock or plaster in the ceiling and walls. In the short term insulation can lose some of its insulating ability and over the long term compresses which means lower R-values. After thorough drying is accomplished the surface needs to be cleaned, sealed, and painted. Drying rather than replacement of water damaged walls and ceilings is a cost-affective solution. Plaster is an absorbent material and holds excess water.