Common Roof Problems are -
- Leaking Roof.
- Moss, Lichen, Algae, Growth.
- Broken, Cracked, Dislocated, Worn-out tiles.
- Cracked, Unbedded Ridges and Chimney Stacks.
- Blocked Gutters, Down pipes and Drains.
- Damaged Flash Valleys.
- Roof Space Conversions.
- Too Hot in Summer.
- Too Cold in Winter.
Concrete and clay tiles are never water proof. Not even when new. Water passes by capillary action through microscopic voids when concrete has dried.Different qualities of both types of tile exist and some have a design life of only 25 years. The reason they are used is not because they are good but because they are cheap and readily available.
The tile surface becomes wet and during the winter when it freezes it expands cracking the surface, causes pits, crazing and spalling, erosion begins. The sand and aggregate eroded from your tiles washes into your gutters. As the surface degrades, moss becomes established, it grows between the tiles and under the laps taking water directly to the timber beneath. Even a thin covering of moss is a problem but worse still a thick covering hides the damage to the tiles.
YOUR HOME TILES BECOME VERY POROUS BECAUSE OF THESE FACTORS, MUCH
BEFORE YOU SEE WATER ENTERING HOME FROM THE ROOF TOP.
As you can understand, moss and lichens are not the problem but symptoms to a
greater problem of degraded, damp and porous tiles.