How to make waterproofing flat roofs?

Waterproofing flat roofs - a necessary measurefor the protection of the roof from the damaging effects of precipitation. This is an important step, the neglect of which may detrimental impact on the integrity of not only the roof, but also the building itself. Therefore, all the waterproofing of the roof work should be carried out during construction, not after the pass couple of years.


  • Types of flat roofs
  • Materials for waterproofing flat roofs
  • Preparing the roof for installation (application) moisture barrier
  • roofing gravity layer
  • Stacking of rolled surfaced materials
  • Application of liquid rubber on the roof

Types of flat roofs

The flat roof can be operated andunexploited. The second embodiment, unlike the former, does not provide the rigid base, intended for laying the waterproofing layer. As a heater for a roof commonly used soft thermal insulation. Unexploited flat roofs on buildings under construction, where the need for regular maintenance of the roof there. Their design is a cake consisting of a concrete slab or sheet metal, insulation and finish coating made of rolled materials.

Operated flat roof - Superiorversion of a traditional roof. This roof has a rigid base that can bear the stress caused during the repair work. A layer of waterproofing on the roof is laid under exploited insulation that allows to protect it from temperature changes, mechanical damage, exposure to the sun and freeze-thaw cycles. Naturally, the service life of such a roof is greatly increased.

Materials for waterproofing flat roofs

Regardless of the type of flat roof of herwaterproofing is done the same way, with the same identical materials. The most common builders used for this purpose roll materials, which include a roll-fusing and polymer-bitumen materials, roofing and PVC membrane. In addition, you can apply and bituminous waterproofing, in particular the new bitumen-polymer options that have high elasticity, basics of strength, improved performance specifications. These include:

  • cast asphalt
  • mastic
  • emulsion
  • adhesive tape.
Waterproofing of the roof mastic

Roofing mastic applied with a roller or brush. The process is long, but worth it

Preparing the roof for installation (application) moisture barrier

Whatever material for the waterproofing of the roof you choose, the process of stacking (application) always starts the same way - with the preparation of the base.

Clean debris from the roof is best compressor- Quickly and effectively. But it is important to act carefully. It is desirable to establish the perimeter of the roof special screens that will prevent blowing dust and debris down. With a compressor sleeves dust in one corner, and then remove its conventional broom or vacuum cleaner construction.

For cleaning the surface of the roof in the jointspanels and fixing miscellaneous equipment (antennas, air conditioning vents, etc.) should be used hard brushes of wire or a drill with a brush attachment. And to finally rid the roof of all the excess, it can wash car wash high pressure. However, the roof will have to be thoroughly dried after such a procedure.

Important: if laid on the roof of the old roll coating, and if possible to remove it you have not, use the sink is not recommended, as part of the water and garbage is bound to be a coating that affect the quality of the waterproofing layer.

If the flat roof waterproofing willheld on the concrete base, it is necessary to remove laitance. The easiest way to do this with the help of grinding. This method will remove the top layer of concrete and open the pores, which after the application of waterproofing clog again.

Besides it is necessary to check for the presence of the roofdefects. If you find cracks and crevices, they have cleaned and restored, using the classic cement-sand mortar. Notice the bubbles (if any) - it is a signal that beneath the topcoat accumulated moisture and if these bubbles just close the liquid rubber, or any web material, the water is not going anywhere, and will be locked inside the "pie". Over time, the increased pressure will burst the roofing material, and you will have to re-engage in repairs.

Important: before installing the waterproofing layer of concrete to be treated special primer.

Mandatory and laying a vapor barrier layer, as it will cause a lack of moisture and insulation, as a consequence, its weighting. The following materials can be used for this purpose:

  • Polypropylene film
  • polyethylene film
  • bituminous materials
Foil vapor barrier for roof

Types of vapor barriers for roofs

An excellent option would be for the steam,flat roof TekhnoNIKOL. The company's products are sold in a wide range and choose the right material will not be difficult, all the more so for the selection of the vapor barrier has developed a table, greatly facilitates the selection.

Technonikol Selection Table vapor barrier

Technonikol Selection Table vapor barrier - a sure way to determine the type of paroizoliruyuschego material and its thickness

roofing gravity layer

Gravity layer flat roof held forthat water does not stagnate on the surface of the roof and ran down special funnels down. Roof pitch is small - from 2 to 4 degrees, but even this will be enough to prevent moisture collected in puddles.

Above the insulation layer is performed under screedbias, besides this tie will create a solid foundation of the roof. Next is laying the waterproofing layer. However, in some cases, the installation of waterproofing is possible directly on the insulation. For example, when used as a heater dense and durable materials such as polyurethane foam or rock wool. However, you will have to do without a tie, and therefore will need to provide the necessary heat insulation slabs slope.

Stacking of rolled surfaced materials

This method, when compared with the classicallaying of roofing material, is much more efficient and easy. As a waterproofing material used roll bitumen, bitumen-polymer and bitumen-rubber coating.

flat roof waterproofing facing materials

Stacking of rolled weldable material on the surface of the roof. The main character - a gas burner

Such materials are very easy to stowindependently. This will require a gas burner and a proper waterproofing of the roll. Warm-burner wrong side of the material, it is necessary to gradually deploy a stick until until the end of the roll or the roof. Lay the strips is necessary with a little overlap of 8-10 cm, prikatyvaya their wooden gurney.

Important: roll on the underside of the applied image which deforms when heated. Once you see that picture, "floated", can produce compacting.

A single layer of rolled waterproofing material will not be enough, so reliability will have to produce a laying of another, and the second layer of the strip should overlap the joints first.

Some types of roofs, such as of buildingslight prefabricated buildings) bonding the first layer of weld waterproofing can be difficult. In this case it is necessary to strengthen the material mechanical fasteners in increments of 50 cm or more. The second and subsequent weld layers by using a gas burner.

Application of liquid rubber on the roof

The use of liquid rubber waterproofingthe roof is the most effective way of protecting the roof from moisture and the damaging effects of the environment, as only this method guarantees the safety of the final coating for 25 years or more. This whole cover, not having not a single seam.

Waterproofing of liquid rubber flat roof

Application of liquid rubber on the roof using a special spray gun

In addition, the liquid rubber is excellent paroizolyatorom, so it is advisable to use if the budget is limited and extra funds for the purchase of materials not.

Waterproofing of the roof is made of liquid rubber mechanized using two-channel mixing and dosing dispenser.

Important: All work involving the application of liquid rubber should be carried out in the dry, windless weather at air temperature not below + 5 ° C.

Apply the material to the surface of the roofuniform strip width of 1 to 1.5 meters. The layer thickness of 3 to 5 mm. And in those places where liquid rubber will be adjacent to the Weathervane, guttering, parapets necessary to make additional reinforcement geotextile waterproofing layer or a single-component liquid rubber.

Of course, this is not the whole range of roofingwaterproofing materials. In fact, they are much more. But the liquid rubber and fusing roll materials are currently the most popular and effective ways to protect the roof from moisture and other troubles.

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