One week more we bring all the information about the plastic weldings and in this occasion we are going to talk about how to waterproof a terrace (it can also be a roof, patio…). It must be taken into account that for any type of waterproofing, there is a basic rule.

The rule deals a basic problem in all the waterproofing and it says that it is totally necessary to determine which are the most affected places by the action of the water and in which points it is necessary to do something to protect it and so we can avoid possible leakages.

Although it is true that it is rather difficult to determine at 100% all the points where water can leak so if we are only dedicated to cover the areas where we believe that water can leak, the work would be totally useless.

This takes us to a very simple; to waterproof a terrace in a totally effective way it is necessary to seal it completely.

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Waterproofing a terrace, a roof or any surface of this kind is a task which requires great knowledge and a right execution. Think that most of the roofs… are totally plain, so as there isn’t inclination the water can be stagnated during several days in determine places (known as pools)

This, among other points, makes that the work of waterproofing terraces must be done taking care of each detail, without neglecting any element.

The process of waterproofing a terrace (remember that it is the same for roofs…) consists in several processes that we have divided into 3 parts:

  1. TOTAL DESINFECTION AND CLEANING OF THE TERRACE
  2. REINFORCE THE POINTS WITH RISK OF A LEAK
  3. PLACE THE INSULATING SHEET

TOTAL DESINFECTION AND CLEANING OF THE TERRACE

First point to take into account when you are going to do the waterproofing, placing the sheet on a terrace that can have elements that can damage it… it is a bad work.

What you must do first is to eliminate any remaining dirt (stones, metals, sharp elements …) of the whole surface of the terrace. Once you have eliminated all these objects it is necessary to clean exhaustively (with detergent and water under pressure) to remove any rest of mould… that can exists there.

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Once you have cleaned correctly the terrace, you must check it by looking for any rest that can have remained. If it is totally cleaned, we can follow to the second step.

REINFORCE THE POINTS WITH RISK OF A LEAK

With this, we want to refer to the points where the rainwater filtering can leak…

There are several points to check that we are going to describe here:

  • Grilles and drain pipes (completely and profoundly checking the edges)
  • The corners of the terraces
  • The plasters in the walls (they can be unstuck…)
  • The expansion joins

Any crack or point that can obstruct the waterproofing and produce filtering must be covered and sealed with an outside sealer.

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Once you have checked and sealed all these points, we can do the third and last step.

PLACING THE INSULATING SHEET

The installation of the insulating sheet must be performed on the whole surface of the terrace. The sheets for this type of waterproofing must be of PVC as it is a material with high resistance and totally waterproofing.

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There are two PVC sheets with UVA rays protection, if it is going to be exposed to the sun or without any kind of protection if you are going to place another element on it.

The installation is simple, the sheets must be overlapped each other by the edges and using a manual welder, it is applied the necessary heat to melt them and through a pressure roller they are tighten each other and so it is got a join at a molecular level (Manual welding of sheets).

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So in this way, there are not two joined sheets, but a totally waterproofed sheet.

This process will be performed along the all terrace, to welded all the sheets that we have placed. To check welding quality, should be performed a check after installation. HERE you can find more information about the checks.

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Thanks and see you next Monday! :)