The ventilation of the roof

La-ventilacion-de-un-tejado

What should be consider regarding the ventilation of the roof?

Adequate ventilation of the roof, unthinkably, is an aspect not often considered when building a house, although it is an important factor that strongly determines its durability and efficiency.
Having this matter into consideration during construction stage will save expensive repairs in the future and will make the cost look insignificant.

As known, ceramic roof tiles are porous products and therefore susceptible to absorb and release water (known as “breath” of the material), that makes them ideal to regulate the moisture inside the building.

How to avoid moisture through the roof in a house?

For a good ventilation of the deck consider:

  • ensuring a good setting of the roof with special attention on the minimum air chamber
  • using Accessories and Roof components
  • using Ventilation roof tiles displayed in a proper array

This permits an easy drying of the roof tiles and eliminates moisture build-up inside the roof.

The roof ventilation will improve the conservation, thereby enhancing the maintenance of the roof. It also reduces the appearance of mosses and fungi, since a well-ventilated roof tile retains the water absorbed for a lot less time and therefore fails to provide moisture conditions that favour germination.

Why is it so important the roof ventilation?

Even if a roof is properly done, the humidity will have access inside. This is a phenomenon always present and technically unavoidable; therefore, the system used for the entire roof must provide a way for the condensed water to be removed from the inner layers of the roof.

Thus, ventilation becomes the key element for that purpose, which is achieved by providing a chamber beneath the roof tiles to force airflow re-cycle through for a continuous drying process.

Related post: Dry installation of clay roof tiles

How to choose a waterproof breathing membrane

Over the last years there has been an increasing use of this type of membranes under the roof tiles. The installers started using these as initial protection of the roof before this is completely finished, assuring the water tightness in case of rains during the execution of the works. After that the membranes are preventing from possible hurts due to water filtering through the tiles.

On the other hand, this increase of demand has done that there are on the market a big number of products of this typology, appearing sheets of different qualities and prices which in numerous occasions are compared between them, being this an erroneous behaviour.

The most important parameters to watch out regarding these membranes are that these sheets have an official declaration of properties (CE marked), where there remain indicated the values obtained in the obligatory tests that the norm demands to this type of products of waterproofing.

The most important technical parameters to choose a roofing membrane the following:

– Water vapour transmission (Sd)
– Maximum tensile strength along and across
– Resistance to tearing (nail shank) along and across
– Reaction to fire
– Resistance to Water Penetration

These parameters, together with the guarantees that the manufacturer offers, will determine the quality of the waterproofing and breathable membranes.

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