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Because roof tiles can be often poorly laid complete with numerous gaps around them, tile or slate roofing cannot always provide the right kind of resistance to protect the roof from the elements, most of all the weather. When architects and designers assess how well a building can insulate itself, they only apply a negligible value (U Value) for the tile/batten cavity/underlay and structure. Adding a roof coating sealant in place across and onto the tiles can make the roof better protected and can further maintain the roof in its ability to ward off any moisture. It is also important to realise the gaps between the tiles are of importance in allowing air movement, which in turn reduces the presence of moisture / damp air cavities with the roof (the space between the tiles and the underlay). If this area is not ventilated condensation can become an issue. If the tiles have been sealed to a high quality, the moisture laden air then has nowhere to go and can then be known to form condensation beneath the space below the tiles. Mortared areas of the roof such as the ridges, hips, valleys and verges in turn require routine periodical inspection and maintenance. The modern roof components such as the underlay, battens and fixings have the requirement to be long standing and reliable. With this in mind, these are areas which are often checked during a survey. Water creeping in through the roof can overall cause a great variety of issues all related to damp. This can then lead to other wider and more significant issues to the property. Sealing the roof should be treated as something of an investment in the sense it will further strengthen and safeguard the roof's structure in time to come.
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