The waterproofing with PVC sheets is an efficient and lasting solution, either when we talk about terraces, balconies, attics, roofs and other architectural elements that are outdoors.

If we know clearly how our specific needs are, it will makes us get right the selection of the material, although we already know that there are many advantages of the PVC for waterproofing: freedom design, reduced welding time, great variety of finishes and long durability.


We do the job or we hire a professional company, it is also a key factor to take into account some preliminary considerations to achieve the total satisfaction. The aim of this text is to talk about those points.

What should I take into account?

Firstly, it is important to know very well the difference between a reparation which has to be done as a periodically maintenance, although at first sight there seem not to be any breaks or imperfections, and to do a reparation because there have been filtrations and it is necessary to repair it as soon as possible.

Between both ends it is situated in which, although there isn’t humidity yet, the cover suffers damage and it is probable that, at any moment, the humidity could appear.

The ideal thing would be study how the cover is, to see the state of the building and to plan the budget that we want to set aside to do this waterproofing work. If we are going to hire a company to do it, once we have decided these steps it will be the moment to go to a specialist to ask for a budget.


How should I work if I want to do it myself?

If we are going to do the work, it is a key to estimate which preliminary works should be done to carry out to install the waterproofing, by valuating the current material, its cleaning, etc. so in this way, we will have an idea of the time we will have to dedicate to this work.

Another important factor is the use we are going to give to the waterproofed surface, either a place to rest or one that is going to be used in some few occasions. This will mark what type of PVC we will use, either without any reinforcement, done with fibreglass, polyester or any other.


One of the higher head-scratching, if we haven’t got much experience, is the one called ‘singular points, like drains, expansion joints, chimneys or corners. It is better to plan how it is to be done before starting the waterproofing, and if you don’t know, ask help for that.

We will also have to distinguish between these types of covers:

  • Ventilated
  • Non-ventilated

In the case of old buildings, without thermal insulation in the covers, you can make most of it if you do it before starting a waterproofing work. The work will be much more expensive and will carry out much more time, but the result will very positive.

Finally, we have to value the slope of the cover; if it is not enough it will produce more failures and we will have to consider if it is necessary to improve it.

>>> IMPORTANT: We should not forget, in the administrative aspect, that it must be proved, in the case that the building is in the historic centre of a city, if the building has any type of architectural protection, as it could affect the elements of the cover like slopes and heights and to limit the use some specific materials.

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