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Black Sea
Waterproofing Centre

DEVI ice and snow melting systems

DEVI systems offer a smart solution for all snow problems. With their help, gutters and culverts will never freeze, exterior stairs, balconies, walkways and ramps are completely dry even in winter. DEVI's ice and snow melting systems consist of heating cables or heating cable mats controlled by DEVI thermostats, self-limiting cables and a series of installation accessories.


DEVI systems provide safety! Ice and snow melting systems from DEVI are designed to provide safety for people and vehicles -through safe walking and driving during winter.


The system is flexible
DEVI's ice and snow melting system works well with most common surface covering materials such as asphalt, concrete, and tiles. Besides, it can clear ice and snow from all types of roof constructions, roof gutters, down pipes and valley gutters.

Works automatically
DEVI's ice and snow melting system operates fully automatically. It automatically registers the need for ice and snow melting and it switches the heat on and off as required.


An economical alternative

The Devireg 850 thermostat with advanced moisture sensors ensure that optimal results are achieved with the least possible amount of energy.
Devireg™ 850 acts on information received from the sensor(s) which register both temperature and moisture on the surface. Devireg™ 850 calculates the information and secures that the heat only will be turned on when the right combination of low temperature and a certain level of moisture are present. At all other time the system is set back to standby. This gives an energy saving system and reduces running costs.Depending on climate and settings, you can save 30-70% on ground systems and 50-70% on roof systems on operating costs compared with systems controlled by air temperature only. The costs of installing and running DEVI's ice and snow melting system are low when the preventive advantages of the system are taken into consideration, i.e. snow shovelling and salting becomes unnecessary and repairing costs caused by ice, snow, and salt are saved.
Furthermore 1 Devireg 850 can control 2 roof/ground/combined zones independently, prioritized or at the same time.  


Roof applications - DEVI’s ice and snow melting systemfor roofs and roof gutters can beinstalled in virtually any type of roofconstruction where there is a needto prevent melt water deposits inroof guttersand reduce damages toconstructions like frozen facadesand roofs.The ice and snow melting systemshould be installed along the edgeof the roof or in places where thereis a risk of ice and snow formations.


In roof gutters and downpipesdamage is prevented by an efficientand free draining of melt water,which naturally ensures that thesystem functions satisfactorily. Electronic deviregthermostatsensure that optimal results areachieved with the least possibleamount of energy. In order toachieve these results sensors andthermostats read the weather withtotal accuracy, automaticallyswitching the heating on and off atexactly the right moment. The typical areas of use are roof constructions, roof gutters, downpipes, and valley gutters.


Roof gutters and downpipes - the cable is led back and forthalong the gutter as many times asnecessary in order to achieve theneeded output. Two lengths ofcable (back and forth) is usuallyadequate.In general, if the dimensioning outdoor temperature is above -20 ̊C,you need:

•2 lengths of cable in a gutterconnected to a cold roof;

•3 lengths of cable in a gutterconnected to a hot roof.

If the dimensioning temperature isbelow -20 ̊C, you need:

•3 lengths of cable in a gutterconnected to a cold roof;

•4 lengths of cable in a gutterconnected to a hot roof.


Indoor areas - Ice and snow melting applications are mostly used on ground are car parks, driveways, pavements, outdoor steps, loading ramps, and bridges.


Installation under concrete Installing deviflex cables or devimat mats inconcrete is similar to the procedure for tiles or asphalt.The cables should be well securedwith devifastfitting bands (whichmay be fastened to the metalarmouring) so they are not dislodged when the concrete is applied.The concrete must cover the cablescompletely without leaving any airpockets.The concrete mixture must notcontain sharp stones as these maydamage the cables. The concrete should be allowed toset for 30 days before the heatingsystem is turned on.An electrician should measure thecable resistance and insulationresistance before and after theconcrete is applied.In places where the heating cablesare to cross expansion joints, thecables must not be subject tomechanical strain in connection withmovements in the construction.


Car parks - Normally, a car park is a large area where fast ice and snow melting isrequired. There are a number of advantages to be gained from installing an ice and snow meltingsystem. It reacts quickly andefficiently against snow and appearsto be an excellentpreventive featureagainst ice. The problem of removingsnow from occupied parking bays iseliminated and as an extra advantagethe car park may be used to the full. For this kind of ice and snow meltingsystem to work efficiently it shouldincorporate the devireg 850 with star/delta function and a deviflex cable or a devimat heating mat.


Driveways- One of the great advantages of anice and snow melting system is the automatic clearing of driveways keeping them passable at all times -night and day. This is especially important in specific situations wherea free passage is needed for ambulances or other types of vehicles.There are two options when an iceand snow melting system isinstalled in a driveway:

1. Covering the entire area with heating cables or mats.

2. Covering just the area affected by car tyres.

We recommend the first option forall major driving areas with heavy traffic. The cleaning of snow and iceformations, which can occur with thesecond option, will be complicated.The second option is recommended for minor areas, like driveways to private garages. If the driving area has a slope, we recommend the entire area be covered with heating cables or mats.  When installing ice and snow melting systems on steep slopes it maybe necessary to provide some formof drainage for the melted water atthe bottom of the slope. The drain system should also be protected against ice formations.


Outdoor steps- An ice and snow melting system may be used as an efficient preventive feature against slippery and dangerous steps.We recommend that outdoor steps are insulated if they are open underneath and susceptible to cold. If, onthe other hand, the steps are solid,they need not to be insulated.The output/min the steps shouldalways be higher than the output/min the area immediately before thesteps. If this is not observed,accidents may occur if the areabefore the steps is free of ice while the steps are slippery.When calculating the cable length for a step application, remember totake into account the extra piece ofcable which is led down the front ofeach step.The cables are laid backwards and forwards in evenly spaced loops along the step. As the heating cables are not installed on the vertical part of the steps, the steps, the first cable loop should be laid as close as possible to the edge of each step (5 cm) to ensure an efficient melting of ice.When the cables are installed allstones or sharp objects should beremoved from the surface as they may damage the cables.The cables are installed directly onthe concrete and must be coveredwith 3-5 cm of concrete.