It's thermal expansion and contraction. The sun hits your roof and heats it up. As the lumber expands, it moves, and it will rub against other pieces of wood that aren't moving at the same rate.
Shingles Not Sealing – Most asphalt shingles have an adhesive strip. When heated by the sun, the strip will cause the shingles to lay down and bond together. It is not uncommon for a new roof to look a bit wavy until this permanent seal is created.
Sagging roofs are typically caused by insufficient internal bracing or undersized rafters/trusses combined with excessive loads of weight. Snow, ice, wind, and even too many layers of shingles can add stress to your roof and cause sagging.
What Does A Sagging roof look like? It's easy to spot sagging roof. You will see a dip on the flat part of your roof, a bow in the roofline, or humps and waviness on the roof plane. If the problem is related to the foundation, you will also begin to see cracks on the exterior walls and uneven support beams.
Sagging: If you can see one section of the roof visibly sagging, you should take immediate action to fortify and repair it. Roof collapses are almost always the result of poor care of the roof over a long period of time, rather than being something that happens all at once.
Here are some more signs to help you identify wood rot in your roof: Wood is darker in spots. There are black, white, yellow, brown or grey growths and discoloration. The wood feels spongy and weak to the touch.
You Need a New Roof If You Notice Curling, Missing, or Mossy Shingles. In some cases, roof damage is obvious from the ground. Shingles are the gateway to your roofing system, so if you notice missing, curling, or cracked shingles when you look at your roof, it's probably time for a roof replacement.
To fix the sagging issue itself, you will likely need to have angled braces installed to shore up the roof rafters. You may also need to add more support to the walls by adding chains affixed to the wall plates and fastened in the middle with a reliable turnbuckle.
Poor ventilation causes heat to build under the shingles, causing them to expand and contract. This movement causes shingles to have ripples. The best way to deal with poor ventilation is to ensure there are enough roof vents and your attic is also properly ventilated and insulated.
A reputable roofing contractor will recommend that you replace your roof somewhere around 80-85% of the manufacturer's specified lifespan. For example, a dimensional asphalt shingle roof has a lifespan of 30 years. You should start considering a replacement around the 27-year mark.
Because a sagging roof could collapse, it means you need emergency roof repair.
Signs of wind damage on a roof include loose or missing shingles, chimney issues, curling or peeling shingles, granule loss, damaged soffit or fascia and indoor leaks. High winds can also cause tree branches to fall and damage a roof. Like hail, wind can cause loss of granules (the sandpaper-like part of the shingle).
Buckling shingles appear as if they are being pushed upward from beneath. It can be the result of a lack of insulation or poor attic ventilation, as well as improper installation. Curling shingles have turned up edges, making the central part of the shingle look like it is sinking (a concave shape).
How to fix it: Unfortunately, the only way to fix this problem is to tear off the entire roof and replace it with thicker decking. You may even need to add additional support between rafters. Since this is such a big job, it's usually best done when you're replacing your shingle roof.
Sagging is a common roofing problem that appears in homes with roofs that haven't been replaced in a long time due to a deteriorated structure. They are also a common problem in older homes due to the way roofs used to be designed. In terms of how much roof sag is acceptable, just about any sagging is bad.
If the ridge of your roof is starting to dip in the middle, you probably have a sagging roof. This is a common issue in homes with roofs that have not been replaced in a long time. Any form of sagging generally indicates that the roofing structure does not have sufficient support for the load.
The average lifespan of a roof usually ranges between 25 to 50 years. However, a roof's life expectancy ultimately depends on the quality, durability and type of material chosen.
However, that is considered a worst-case scenario. Keep in mind that a typical roof can't last long without shingles. In most situations, the roof should only be exposed for 30 to 60 days before the structure can become damaged. Exposure to the elements and wildlife can cause significant damage to your roof.
Bowed or sagging ridge
The ridge of your roof is the point at which the two slopes meet, forming a horizontal line. If this line does not appear straight, and instead looks bowed, sunken, buckling, or sagging, this could be an indication that the support beams of your roof have started to rot.
It depends on whether or not the leak was due to an accident or your own negligence. They will send an assessor to inspect your roof. If the assessor believes the cause of the leak was accidental, such as damage from hail or storm-related debris, the insurer will usually approve your claim.
INCREASING ROOF WEIGHT
Changing to a heavier roof-covering material can cause compression cracking in drywall because the added weight can cause additional settling in the home's structural framing. This condition can actually be dangerous if the roof framing is not adequate to support the additional weight.
Your roof takes the brunt of the wind force, which is part of its purpose. To withstand all that force, the roof has to feature a solid base of construction. Otherwise, the roof system will flex to absorb all that force. When that flex is happening, you may hear a series of popping noises.