Replacement on the other hand needs to take place at some point in the life of all slate roofs particularly those on older historical houses.
How do you replace a roof slate.
A slate roof can generally last at least 80 to 100 years with many lasting much more than that.
Extensive rust damage can indicate roof replacement as well as holes tears and cracks.
After 45 75 years.
Broken or missing slates are easy enough to spot.
When 20 to 30 of the slates on a roof need replacement it is usually more prudent to replace the entire roof than to perform expensive annual repairs.
The type of slate the quality of the slate roof pitch and weather conditions are some factors that can affect how long a slate roof will last.
Even a slate roof that has been meticulously maintained will need to be replaced during someone s ownership.
When to replace a slate roof.
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If the tiles crack the roof is too old.
This article explains how to remove and replace individual slates during repairs to a leaky or damaged slate roof.
Often this is done incorrectly to save time and money by simply overlapping the roof tiles onto the slate roof this nearly always leaks sooner or later.
The rule of thumb among slaters is to push for replacement once 20 30 of the slate has deteriorated beyond reasonable repair.
Replacing a slate roof.
If 20 or more of the slates on a roof or roof slope are broken cracked missing or sliding out of position it is usually less expensive to replace the roof than to execute individual repairs.
When it comes to joining onto a slate roof with tiles or different sized slates you will need a jointing valley or bonding gutter.
If you are inspecting the roof from a ladder choose a few solid looking slate tiles from different areas of the roof and push hard on them with your hand.
An annual inspection is prudent as repairing small defects such as broken tiles or loose fastenings will ensure a long lasting roof.
Slate roofing is rarely subject to an entire roof replacement.
How to replace missing cracked or damaged roofing slates.
By using copper tabs or slate hooks it is possible to replace just a single roofing slate where needed.
How to repair a leaky slate roof.
There are a number of factors that will extend or limit the lifespan of a slate roof.