- Applicable building codes
- Design snow load
- Structural framing system
- Thermal properties
- Renovation history
- Perform a detailed inspection. Check for cracks, split seams, buckling, loose parts, staining, mold and rot while inspecting:
- Surface membranes
- Roof vents
- Flashing
- Field tears
- Gutters
- Drainage pipes
- Clean debris. Ensure the roof is clear of debris, including fallen branches, leaves and garbage. Debris can prevent water from draining, allowing snow to build up and cause water damage or add weight to the structure.
- Look for pooling water. Keep an eye out for areas where water pools, as this could be an indication of a clogged drain or slow-draining line.
- Check the flashing. Inspect the flashing—the thin material used to direct water away from certain areas on the roof—before winter for cracks or crevices that would allow water to enter.
- Inspect the downspouts. Ensure downspouts are properly attached to the gutters, clear of debris and that their termination bars are sealed.
- Ceiling tiles or boards that are sagging or falling out of the ceiling grid
- Sprinkler lines and sprinkler heads that are sagging or deflecting below suspended ceilings
- Roof members, such as metal decking or plywood sheathing, that are sagging
- Doors or windows that no longer open or close
- Wood members that are cracked or split
- Walls or masonry that are cracked
- Truss bottom chords or web members that are bowing
- Popping, cracking and creaking noises