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Roofers lay tiles loosely over each other in an overlapping pattern, and hold them in place with edging fascias, and special tiles cemented in place along the ridges. If these ridges fail, then there is a possibility of a strong wind lifting sheets of roof tiles with disastrous results. This fairly common problem usually begins as roofs settle after the first few years, and 
the rendering beneath the ridges separates.
This is not a job for an amateur with a bad head for heights. In fact, we strongly recommend that you Find a Roofer to do the following work for you instead.
• Identify which ridge tiles have worked loose. This could be just one, a few, or the entire ridge, and the solution varies accordingly. If you can remove the loose tiles without disturbing the adjacent ones then this could save you time and money, although it is unwise to take chances and end up with a patch job.
• Obtain a supply of replacement ridge tiles. Remove offending ridges, set them aside and carefully chisel the loose rendering off the roof tiles beneath. You can leave a small residue of old rendering behind, provided that this is firmly attached.
• Soak the replacement ridge tiles and the supporting roof tiles with clean water until they have taken up a slightly darker hue. This ensures that they do not suck the moisture out of the new rendering, and weaken it.
• 
Loose fit a new ridge tile, make a chalk mark on either side of it, and set it aside again. Lay two generous lines of suitable tinted rendering within the chalk lines. Press the ridge tile gently into place and remove any surplus rendering with trowel and damp cloth. Repeat the process as necessary along the entire ridge, remembering to close in the ends of the last ridge tiles if you replaced these too.
• A competent London Roofer will always check carefully that there are no cracks or holes showing anywhere on the ridge. This is because a strong gust of wind can blow rainwater through a tiny hole into the roof space below with surprising force, and form damaging pools on ceilings.
Should you decide to get a Roofing Quote on Mr-Skill, then we would be delighted to put you in touch with several rated tradesmen working in your area. We know you will be satisfied with the price and quality of the bids that you receive, and we wish you well with your roofing project too.