Welcome North Manchester Roofers. Our Specialist Roofing Division. BS5534 Compliant
Welcome to NMB Manchester Roofing. As with our other departments we specialize in all aspects of roofing in Manchester. We only employ highly skilled time served roofers. Our roofing teams have vast experience in all areas of the roofing trade and deal with EPDM rubber flat roofs, GRP fibreglass flat roofs, Reclaim slate roofing, GRP slate style roofing, Concrete tiles such as Marley Moderns and Double Roman tiles in a vast array of styles and colours.
NMB Roofing work is fully insured and guaranteed as you would expect. Our insurance runs to £2million and our guarantees depend on what ypu are having done to the roof. Ie if its a repair or a full new re-roof.
What Roofing system should i choose?
Over the years, manufacturers have come up with numerous roofing systems which do away altogether with the need for sand and cement mortars. These systems, popularly known as “dry-verge” and “Dry Ridge” roofing systems, present you with a number of advantages over the old cement mortar:
1. Remove the dependence on regular repairs and upkeep of the roof. Over time, mortar can suffer from frost damage (water gets into tiny holes and expands as it freezes pushing out cement) and building movement. When this occurs, repairs can be extremely costly as scaffold access can often be required. By eliminating mortar from the top of the roof you can virtually eliminate such maintenance and issues in the future.
2. Allows the natural movement inside a roof structure to happen without damaging the ridge and hip fixings.
3. Provide the method for mechanically fixing ridges and hip tiles, greatly lowering the risk of storm damage.
4. Provide discreet roof space ventilation within the ridge and hip dry system which supports control of harmful condensation in the top of the roof space.
5. Allows the roofer to accomplish the work safe inside the knowledge that rain will never cause mortar to stain the rooftop or frost to break the mortar before they have had possibility to properly set which is a regular occurrence especially here in the UK
Dry Ridge Systems
Dry Ridge systems are available in a variety of designs but give you a similar volume of performance. They are created to securely fix the ridge tiles mechanically which might be located on the apex of your roof. When using dry ridge systems the mortar joints between ridge tiles are replaced by plastic inserts and clips, referred to as unions, that induce the visual appearance of your mortar joint but employ a hidden weather proofing system that carries away the water.
The next significant and important component of a dry ridge system sits between your ridges along with the tiles of the roof top slope. This part with the system usually has a ventilated strip that ensures moisture laden air is vented from beneath the tiles into the air above. The interface using the ridges plus the tiles can be treated in two ways. The first method uses plastic inserts following the shape of the tiles, the second method uses an adhesive roll that is corrugated and stuck right down to the tile surface. Whilst the ‘roll’ systems will be the most affordable, the profile system looks the very best and offers a good edge when it comes to longevity of the ridge system.
A dry fix system replaces the mortar traditionally used on the ridge.
Dry Hip Systems
A hip may be the external junction between two sloping roof faces. As with ridges the traditional and historic method of weather proofing this sort of junction would be to use ridge tiles that lap over the next then secured using a bed on sand and cement mortar.
Dry Hip systems eliminate the necessity for mortar and supply a more secure and maintenance free hip detail. The systems stick to a very similar design to dry ridge systems. The one key difference is curved or profiled tiles are widely-used, the dry hip system will make use of some form of tray to produce support over the length from the hip line. This tray helps to ensure the roofer produces a neat hip line, without them the ridges will be sitting on the undulating tiles below. This would create an uneven hip line which not just looks unsightly but sometimes affects the performance from the dry hip system (for instance, it may leak).
Some traditional roofers in Manchester prefer goods like plain tiles and slates over the dry hip system because they can be cut, or mitred, towards the hip line with weatherproofing provided by plastic or lead soakers which might be laid underneath.
The dry hip system shown above replaces the mortar traditionally used for the hip.
Dry Verge Roofing Systems Manchester
A verge refers towards the junction between your roof and the gable end of the building. A gable end refers towards the wall that infills between two opposite roof slopes and, sometimes finishes in a very triangular shape. The traditional strategy for finishing the top at a gable wall is with a bed of mortar. Traditionally this detail features a layer of plain tiles, slates or fibre cement board to assist inside the weatherproofing. Unfortunately all too often this kind of verge is poorly installed, bringing about eventual water ingress. Even if properly installed a verge detail requires regular maintenance which is prone to mortar failure. Again frost damage can cause problems when water gets in behind the mortar, freezes and expands then pushes out the mortar.
Dry verge systems aid in avoiding these problematic defects and the dependence on periodic repair of the mortar bedding. For many tiles, special ‘cloaked verge’ tiles can be obtained which neatly close the gap with the verge. Alternatively, plastic dry verge systems are offered which suit most tiles. These are offered in single units, ie one piece per tile course, or maybe in continuous lengths. These are attractive and highly functional methods to improving the overall look of your roof. The systems are easy-to-use and supply a neat, secure and mortar-less finish at roof verge
A dry verge system can even reduce the likelihood of wind damage, water penetration and will definately stop small animals and birds getting into your roof space.
The dry verge system shown above replaces the mortar traditionally used for the verge.
Are dry ridge systems more expensive than mortar?
This isn’t any easy question to respond to as there are many systems in the marketplace, along with the fact that a large proportion of the cost of both mortar bedding and dry systems is inside the labour. As a broad rule of thumb the cost from the dry system per linear metre of ridge or hip will be more than the cost of mortar. However, this additional tariff of materials ought to be counter acted through the labour saving advantage of using a mechanical system. Some roofers don’t properly look at the true labour valuation on mixing the mortar, getting it up to the top of the roof and the time spend bedding and pointing each ridge or hip tile. Also, they could forget if a ridge is mortared, other means have to be found to ventilate, which implies additional cost in tile or ridge ventilators.
On this basis utilizing a dry product is usually cost neutral, that may be until you consider the future price of maintenance.
In our experience and in the experience of many roofers in Manchester that we have known over the years, we would always choose a dry ridge or hip system over the mortar option due to the lack of call backs we get from the dry ridge which of course means there are less problems with the dry ridge systems which is both good news for the client and roofer!