To promote an adequate bond it is necessary to stop too much suction from the substrate. If the roofing tiles and ridge are too dry they will suck the moisture from the mix before a sufficient bond is made. Where possible the ridge tiles should be primed. Soak them in a large tub for an hour or so and wet down the top course of roofing tiles. If this is not possible a mixture of one part PVA to 3 parts water should be applied to the bonding area. This will prevent the roofing tiles from drawing too much moisture away from the mortar.
When you opt for a ceramic tile, make sure they are adequately fire-hardened or baked to make it insusceptible to water penetration and destructive freeze-thaw cycles. Though tile roofing may cost much more expensive than asphalt, they, however, offer a lifetime roofing solution giving you a lower effective cost in the long run.
Modern metal roofs look better, gone are the days of green corrugated metal. Modern roofs come in many colors and types that will fit the look of any home. As you can see, there are a number of advantages to choosing metal roofing for your home. The one disadvantage is that the initial cost is much higher than other types of roofing. However, if you consider the cost over many years, the cost comes into line with the cost of other materials. For example, if you have a metal roof installed at the same time your neighbor installs asphalt materials you can watch them spend money maintaining and repairing their roof. You will also watch them spend money having their roof replaced two or three times while your metal materials are still in good condition.