How to Check for a Sagging Roof

Residential roofs are fastened against trusses, which are secured to the concrete block and/or wood frame. The roof is typically constructed of pressure-treated, weather-proof plywood and covered in aluminum, tile or, most commonly, shingles. Because the roof is exposed to the elements day in and day out, year after year, they may become weak and begin to sag. This is generally subtle enough not to be readily visible, so you need to take several steps to determine if your roof is sagging.

Ladder

Instructions

- 1
  Start inside to look for one of the most tell-tale signs. Inspect your ceiling for sags and bulges. Push up on the ceiling to determine if it is wet or being pressed downward by a sagging roof truss.
- 2
  Go outside and walk the exterior perimeter of your home, looking up at the shingles near and on the edge above the eaves. If the shingles are curling up, the roof may be sagging. If you have wood shingles, look for cracked or bowed wood shingles, possibly indicating a sagging roof.
- 3
  Take note of the flashing as you walk around your house. If it is bowed or coming undone, your roof might be sagging, or there could be another problem, such as loose nails or screws holding the flashing.
- 4
  Place a ladder against an outside wall with the ridge line above it. The ridge line is the tallest point on your house, where the roof "peaks" into a triangle shape. Climb the ladder and look across the ridge line. If is not straight or appears bowed, the roof is likely sagging and in need of replacement.

How to Inspect a Slate Roof

What Can You Do for a Leaking Roof When You Have No Money to Replace It?

Roof Repairs