How old is that roof.
How to age roof tiles.
Most modern tiles have ink jet markings that give batch information to identify the place and date of manufacture.
If you are adding tiles to a roof that did not previously have them or to a design which did not originally incorporate them the roof may not be capable of carrying the excess weight.
Roofs last a long time with the typical asphalt shingle roof lasting between 15 to 25 years depending on the type of installation.
Flat roofs the lifespan of a flat roof depends on the material covering it.
With proper installation and routine maintenance a tile roof can withstand fires and in some instances offer greater protection against high winds hail and freeze thaw climates providing years of worry free performance.
Their centuries old track record.
While clay roof tiles have been used on roofs for centuries concrete tiles have become more widespread over the last half a century.
Clay tile typically lasts 40 to 60 years while slate and concrete tiles have a lifespan of 50 to 100 years.
As it turns out tile roofs don t just sound tough and long lasting.
From this it may be possible to obtain secondhand tiles from a roofing or salvage merchant.
Obviously the best way to know your roof s age is by keeping records from the last time the roof was replaced.
Concrete tiles which are usually lighter than clay tiles can easily place over 10 pounds of weight per square foot on a roof.