Curled and buckled shingles (Flat Roof)
This can be a sign of age, Buckled shingles can occur because of moisture in the loft space forcing nails to push up and out of the roofs decking. This mishap can leave your home exposed to outside elements as well as being prone to shingle blow offs during a storm.
Tar Streaking and Algae
This is caused by bacteria eating away at the shingles waterproofing properties.
Cheap shingle manufactures compromise the weather proofing properties by using fillers like limestone to keep the cost low, therefore algae eaters away the limestone causing the black streaking.
To check for missing granules it is a good idea to check your gutters and downspout splash pan for lose granules, sometimes you can shake it and if you hear rattling then that is a sure sign that you’re shingle granules are falling off. If you are missing shingles on you’re roof , there is a open pathway for water to enter you’re home.
If there isn’t proper ventilation in your loft warm air gets trapped, once this happens condensation develops on the underside of the roof, causing rusty nails and eventually Mould growth.
It can happen with new and old roofs due to over insulating, which in course will block some of the vents so air can not escape. This is why your home home needs appropriate intake (Soffits) and exhaust (Ridge vent)
It is extremely important that your home has a proper intake and ventilation as Mould and Mildew are an extremely intense health hazard and it is a recommendation that you should act now to prevent extra costs of replacing all damaged wood as well as Mould remediation.
Each roof should have a ridge vent to remove excess heat and moisture which in turn will save on energy bills and prevent peeling of interior paint.
Your roof and chimney should be properly flashed so your home is protected by the elements.
If you have water leaking around your chimney then that is a sure sign the chimney has not been flashed properly or that it is no longer performing.
You will want to make sure your roofing contractor has used a leak proof barrier to provide protection against leaks in vulnerable areas such as the chimney, eaves, rake and side walls.