How can you tell from inside the house that your roof needs replacement?
Short answer. Check the attic on a sunny day: daylight through the deck, dark water stains or rot on the decking, wet or matted insulation and a sagging roofline all point to a roof that is failing. In the living space, ceiling stains, bubbling paint near the tops of walls and a musty smell confirm water is getting through.
The attic check
- Daylight. A little light at a ridge vent is normal, but light through the field of the deck means gaps or missing material.
- Stains and rot. Dark rings or soft areas on the underside of the decking, especially around chimneys, pipes, valleys and skylights. Probe gently with a screwdriver.
- Wet insulation. Compressed, stained or damp insulation below a leak.
- Rusty nail tips. Rust on the nails poking through the deck, or frost on them on cold mornings, signals attic moisture, often from poor ventilation rather than a roof leak.
- Sagging. Decking that dips between rafters or a ridge line that is no longer straight.
Clues in the living space
- Brown rings on ceilings, especially after heavy rain.
- Bubbling paint or loose drywall tape at the top of exterior walls.
- A musty smell in upstairs closets or bonus rooms.
- An upstairs that keeps getting hotter in summer, which can mean ventilation or insulation problems.
Reading the results
One stain under a pipe boot is usually a repair. Stains in several places, widespread deck damage or sagging point toward replacement. Moisture without an obvious leak points first to ventilation. Compare what you find with the outside checklist in signs you need a new roof, and see roof ventilation basics for the condensation side.