Types And Techniques Of Waterproofing The Floor In A House And Apartment Under A Cement Screed

Table of contents:

Types And Techniques Of Waterproofing The Floor In A House And Apartment Under A Cement Screed
Types And Techniques Of Waterproofing The Floor In A House And Apartment Under A Cement Screed
  • Varieties and methods of insulating materials
  • Waterproofing techniques
  • Insulation materials for wet floor screed

Each master will confirm that when building a new house or major repairs, it is imperative to install waterproofing. It will reliably preserve the main floors and protect against water penetration to the neighbors when the floor is wet screed. If there is a flood, then with high-quality protection, you will not be afraid to flood your neighbors from below. Therefore, when designing and renovating, you need to know how to waterproof the floor in an apartment.

Varieties and methods of insulating materials

Before deciding exactly on the waterproofing method, it is necessary to take into account the factors:

  • type of working base;
  • the purpose of the room;
  • Operating conditions

Currently, manufacturers of building materials offer the consumer a fairly wide selection of materials. The choice of material for waterproofing the floor should be based on how the room will be used, its location.

There are also several ways to apply materials to the work surface:

  1. Coating, coating, painting.
  2. Penetrating.
  3. Membrane, roll, film.
  4. Powder.
  5. Plaster.

The most famous and easy to use is the roll-on waterproofing for the floor. All building materials for it are made of fabric or cardboard, which are pre-treated with a mixture of bitumen. The top layer is basalt chips.

  1. Rolled membrane material performs two important functions at once: hydro and thermal protection. Most often, self-adhesive material is used, this greatly simplifies and speeds up the work process.

    Roll waterproofing floor
    Roll waterproofing floor
  2. Film waterproofing. These are all types of films, which include polyethylene, polypropylene. It is often used as a base for wooden floors.
  3. Mastic. The composition of the materials includes bitumen, glass, liquid rubber, resin, polymers. They reliably protect the floor from any moisture attack. This is especially important when work is planned on bathroom floors. The peculiarity of the composition of the mastic is a plasticizer, because of it the film slowly spreads over the entire floor, penetrating and filling all the holes.

There are several types of mastic for floor waterproofing:

  1. Bituminous.
  2. Polymeric.
  3. Bituminous-polymer.
  4. Mineral.
Floor covered with waterproofing mastic
Floor covered with waterproofing mastic
  1. Liquid waterproofing. These are paint, varnish, viscous compounds. Their feature is that they form a water-repellent film on the entire working surface. It is actively used when working with concrete and wood floors.

    Liquid waterproofing of the floor
    Liquid waterproofing of the floor
  2. Powder. It contains cement, plasticizers, glue. Very relevant for waterproofing under floor heating.

Waterproofing techniques

Before starting work with the floor, it is necessary to clear the work surface: remove all unnecessary, debris, if necessary, dry.

Liquid waterproofing for the floor is relevant only for solid substrates. To implement its cast version, you must:

  • Pour the heated waterproofing compound over the floor.
  • Drop it using a putty knife.

If the composition does not require heating, then the composition is simply poured across the floor. In any case, you need to make several layers.

The layer of liquid waterproofing can reach up to 15 cm in height due to its multi-layering. Therefore, this should be taken into account when designing works.

There is also a method of applying liquid waterproofing using impregnation. Then the composition is sprayed or applied with a brush.


The essence of coating and paint insulation is to create a waterproof film, the thickness of which should be no more than three millimeters. To apply it, brushes or rollers are used.

In such waterproofing compositions, impurities are often added that protect the floor from mold formation, and also have anti-corrosion properties. However, they require renewal every 4–5 years.


Separately, it should be said about the pasting waterproofing. It is done in three ways:

  1. Spreading.
  2. Gluing.
  3. Fusion.

Spread the working material on the cleared space under the base of the floor. It can be fixed in any way, glued or simply left lying.

The deposition procedure is carried out using gas burners. In this case, fire safety measures should be observed. The material is glued using glue and special mastic. And also there are materials on which a layer of glue is already present.


Insulation materials for wet floor screed

When a wet floor screed is made, a waterproofing layer must be taken care of. It has two functions:

  1. Protects against moisture during floor use.
  2. Save neighbors from below from the flood.

Concrete slabs that form ceiling slabs, no matter how massive and durable they look, let moisture through microcracks and seams. Therefore, if you do not create protection against moisture, all the water in the screed process, accompanied by "wet" work, will go down and spoil the appearance of the neighbor's ceiling.

To make waterproofing in front of a wet floor screed, you must:

  • Clean the floor from dust debris, thoroughly sweep everything.
  • Prime the floor, wait for the primer to dry.
  • Find cracks and seams, and seal them with a hard-density sand-cement mortar, it should not spread too much. In order for the solution to adhere well, all cracks must be expanded to 1–1.5 cm.
  • When the gaps are closed and the mortar has dried, cement waterproofing should be used. It must be applied in an even layer on the floor, for this you can use a trowel.
  • After that, you need to apply the mastic. It is recommended to make 2-4 layers. The mastic dries up in 6 hours. If you apply the next layer after this time, then it will not adhere. Therefore, the layers should be repeated after 3-4 hours.

When the layers of mastic are dry, you can proceed to the wet floor screed

This method is suitable for "dry" rooms - living room, bedroom. In the bathroom, she recommends supplementing the method with roll deposited bitumen layers, which are mounted using burners. Learn more about the materials for preparing the bathroom floor.


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