Metal and concrete tile roofs depend upon a painted on membrane seal to protect them against the effects of weathering and the development of leaks. Roof paint is much less expensive than a roof replacement, so it is important to know when it is time to have the paint reapplied. Failure to do so when necessary can lead to roof damage and the need for a new roof.
Roof paint is designed to last for about a decade, give or take a few years. If it's been at least that long since the last time your roof was painted, then it is time to consult with a roofer to see if the paint needs replacing. At the very least, perform regular inspections once the roof is older so that you can catch the first early signs of failure immediately.
2. Colour Fade
Although roof paint is available as a clear membrane, many people prefer to choose a tinted variety so they can combine roof painting with a roof colour update. If your roof was treated with coloured paint, then one of the first signs that it's time to repaint is when the old colour begins to fade. This indicates that UV light has begun to break down the paint, so it is no longer protecting your roof as it should.
A more severe sign that it is time to repaint the roof is if you notice peeling, bubbling or flaking. This damage occurs when moisture gets beneath the paint layer due to aging and membrane damage. It won't be long before the water begins to make its way into your home, particularly if the roof material is porous cement shingles.
Leaks in the home are never a good sign. You may see bubbling ceiling paint or simple discolouration. There may be a musty odour of mould in attics and ceiling crawlspaces. Once water is leaking in, the old paint has failed and damage has already begun to affect your roof. A roofer must repair any damage to the panels or shingles before they can repaint. If the damage is severe, you may need a roof replacement.
5. Seal Damage
Most roofs have some seals and flashing. Metal panels are sealed along the seams as well as around rooftop penetrations such as chimneys and vents, while tile roofs have flashing around penetrations. The roof paint over these areas often begins to peel and fail first, so pay special attention to the seals when you are inspecting the state of the roof paint.
Contact a roof replacement and restoration service if it is time to paint the roof again.