Mortar has been used in roofing for hundreds of years. Its principle use is as a means of fixing and weather tightness at junctions such as ridges and verges.
Whilst mortar certainly does the job, there are a number of disadvantages it is worth being aware of. First, mortar has a limited lifespan and requires regular maintenance because it will deteriorate in time through natural weathering.
Secondly mortar is susceptible to cracking because of the natural movement within the building structure, particularly where the roof passes over solid masonry walls. Once this happens, the ridges, hips or verges can become dislodged by high winds, and will be susceptible to water ingress.
Dry Ridge Systems in Northampton comes in a variety of designs but offer a similar level of performance. They are designed to secure the ridge tiles which are located at the apex of a roof. When using dry ridge systems the mortar joints between ridge tiles are replaced by plastic inserts, known as unions, that create the visual appearance of a mortar joint but have a hidden weather proofing system that carries away the water.
The next significant component of a dry ridge system sits between the ridges and the tiles of the roof slope. This part of the system usually includes a ventilated strip that ensures moisture laden air is vented from under the tiles. The interface with the ridges and the tiles can be handled in two ways. The first method uses plastic inserts following the shape of the tiles, the second uses an adhesive roll which is corrugated and stuck down to the tile surface. Whilst the ‘roll’ systems are the most affordable, the profile system looks the best and offers an edge when it comes to longevity.