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How to waterproof the roof

How to waterproof the roof


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How to waterproof the roof: the different solutions, advantages and disadvantages of certain products and advice for waterproofing the roof, terrace, balcony and other roofing.

Humidity on the walls, mold and infiltration problems are the alarm bells that should push us to improve the degree of insulation of our home. Typically, infiltrations are given to problems with the waterproofing layer of our roof, terrace or roof.

A good roof should consist of a surface layer or coating, a layer of waterproofing, thermal insulation, the hanging screed and a vapor barrier. With the passage of time and the dense autumn rains, the waterproofing layer could give way, giving rise to water infiltration.

Beforewaterproof the roofwith a new waterproofing material, check the state of conservation of the supports and the existence of any depressions and slopes: onroof, as well as on terraces and balconies, there must be no water stagnation. If necessary, install the gutters following our guides "How to mount a PVC gutter "is “gutter assembly “.

How to waterproof a roof

For waterproof the roof there are several specific hedging systems. Each product has advantages and disadvantages and can be chosen according to the needs of the building. In this paragraph we will list the waterproofing products to be used both in the case of new buildings, and to repair a roof with infiltration problems.

Bituminous membranes

Bituminous roofing is the most popular when it comes towaterproof roofs and terraces. It is a product derived from the processing of petroleum, they are generally prefabricated and require a surface protection that can be given by the pavement or gravel.

The application involves the use of the classic open flame. Anyone who has a bituminous membrane layer on the roof and has infiltration problems can very well overlay a new layer of bituminous membranes. It is the solution with the best value for money because it returns a highly waterproofing layer, resistant, durable over time and walkable. As it is a product derived from the distillation of petroleum, it is not easy to dispose of and harmful gases are emitted when inhaled.

Polymer membranes

They are similar to bituminous membranes but here the percentage of bitumen is less than 50%. They are given by plastic polymers such as PVC or polyethylene. They have excellent elasticity but cannot be used for laying on roofs treated with bitumen, asphalt, tars, solvents, oils and other products with hydrocarbons. They are much less common than bituminous membranes, probably also due to the poor resistance to UV rays.

Self-adhesive membranes

Self-adhesive membranes can be both bituminous and polymeric. Compared to the prefabricated bituminous membranes described above, they have the advantage of being easier to "lay". The installation, in fact, uses a cold system and does not require open flames. Do not be fooled, even if the installation can take place without flame, it is not certain that it is easy to do it yourself: for lateral installation it is necessary to use appliances that generate hot air without flame.

Dry-laid self-adhesive membranes are recommended when the roof or terrace it would not be able to undergo the heat produced by the free flame necessary for laying the bituminous membranes. Sometimes the insulating layer is sensitive to heat and can deteriorate when the bituminous layer is laid hot.

Self-protected membranes with copper, aluminum or slate coating

All systems forwaterproof the roofseen so far, to ensure good waterproofing and resistance over time, provided for an additional layer of coverage given by floor, gravel or other solutions designed to protect the waterproofing from UV damage. Self-protected membranes, as the term suggests, can be left exposed because they are resistant to atmospheric agents, bad weather and UV rays.

The protection layer can be slated or with copper or aluminum sheets. Self-protected membranes coated with copper or aluminum are more expensive but are not subject to wear, unlike slate ones.

Installation is simpler (cold application), and the waterproofing layer obtained reduces heat absorption. The highest costs can be "recovered "already from the fact that no further coverage will be needed. It is not suitable forwaterproofing of terraces and balconiesas it is not always walkable.

Other solutions for waterproof the roof are available in the article "waterproofing of terraces and balconies“.


Video: How to Waterproof a Metal Roof. Liquid Rubber (May 2022).