Typically before 1890 nineteenth century roofs often contained narrow rafters.
Roof tile defects.
Roofs can also become defective due to other defective elements of a building such as a failing load bearing wall.
These cracked tiles are then at a greater risk of falling off the roof which will leave the felt underneath exposed to the elements.
Some roof leaks are tough to locate.
In this photo not only are tiles cracked broken and displaced but mortar has crumbled and collected in the pan tiles that form water channels.
This demonstrates the advantages of slate hooks in lieu of copper strips when replacing lost slates.
Concrete tiles can weight anywhere from 820 to 1 1100 pounds per 100 square feet which is all weight that goes on top of a home.
Cracked tiles can also occur after water or snow on the roof freezes and expands.
When compared to other roofing materials like asphalt clay composite and metal concrete roof tiles are significantly heavier.
Eventually this will cause the bond between clay and mortar to fail and tiles will become displaced another sign of old tile.
One of the first problems that come with concrete roof tiles is their sheer weight.
Concrete tiles are often brittle so we recommend only authorized personnel be allowed to walk on your.
We ve put together a few of the most common roof defects problems we find with roofs on surveys so you have a better idea of what you should be looking out for.
Roof tiles not slate repaired using copper strips the strip ends holding tiles have been bent back by sliding snow expect movement leaks and extensive nail failures.
This defect also occurs on slate roofs repaired using this method.
Slipped broken slates or tiles.
Poor design damp penetration and failure of the roof covering which we sometimes see in out house surveys in london.
Common roof defects concrete tile roofs.
There are a number of reasons why a roof may be defective.
Poor designs found in pitched roofs inadequately sized members.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic often water runs to openings in the vapor barrier such as at ceiling light fixtures.
The common failures on clay tile roofs include cracked broken tiles spalling in freezing climates loose tiles that slide down out of place on roofs where not every tile is secured to the roof deck flashing failures corrosion or cracking and fastener failures.
Sometimes the water shows up at a ceiling spot distant from the leak.
Moss attracts birds which feed off it and can damage the tiles in the process.
Individual slates or tiles can suffer breaking or cracking.
Common roof defects concrete tile concrete tile is seen in many of the same shapes as clay tile and are normally found in flat or curved categories.
Defects in pitched roofs normally caused by 3 main factors.