Slate Roofing Problems in Raleigh NC
Tile and slate can both crack, because of severe weather along with natural deterioration. Cracks in tiles usually occur on account of imperfect firing in the clay tile within the kiln. Hairline cracks, formed in the firing process, is usually exploited by vegetation and rainwater. In every cases, the expansion of the crack leads to a weakening of the tile, which in time can falter. Such cracking might occur throughout the width or the depth from the tile. In each case the pattern of cracking might appear different, and the reliability of the tile may be inconsistent
Cracking across the nail or peg holes also occurs. A natural weakness, the expansion of rusting iron nails as well as swelling wooden pegs can exacerbate any imperfection, including ragged holes. Other imperfections that may create problems include parts of tile which can be subtly different in their makeup, and either fire harder or softer than the rest of the batch. Occasionally too, there might be small stones within the tile which expand and crack when fired. In instances where such imperfections are generally overlooked within the production process, cracking and deterioration will occur once fixed to a roof. Freezing weather following rain boosts the amount of the water inside the roof covering (because water expands upon freezing). Freezing, over time, could cause cracking.
De-lamination with the underside with the covering is characteristic of slate which has deteriorated through water ingress. The geology in the material signifies that it consists of a lot of layers, which could over time separate through water ingress. This is often a particular problem because over time the de-lamination may become so severe that the slate has stopped being good at preventing rainwater getting in the structure. Clay tile can also be subject to a similarly destructive process, but since it is man-made and not natural, it crumbles instead of delaminates. This sort of deterioration is caused either through the freezing / thawing cycles of rainwater which has been drawn up the underside of the covering, over several years, or from the salts in rainwater that have effectively broken down the material. Capillary action also occurs across the joints of tiles and slates and is then drawn to the underside of the covering and into the fabric. Again, during a span of time cracking of the edges of the covering can occur.
Only during repair work may such harm to the covering be discovered.
This can be a term applied to nails which are so seriously rusted that they can no longer carry out their process correctly. Many years of condensation or rainwater ingress affect the strength of the iron nails, which can ultimately fail. On a roof with an severe issue, the whole covering can slump.