Film waterproofing of the foundation

When performing waterproofing of the foundation, film materials are often used. The film for waterproofing the foundation can perform several functions:

• The main waterproofing layer. For this purpose, diffusion film membranes, vapor-permeable, but not transmissive to moisture, are usually used;
• Films for an auxiliary waterproofing layer, for example, thick polyethylene. It is used as an intermediate layer between the ground and the main waterproofing or between a heater and a concrete screed.

The advantages of film waterproofing include their resistance to destruction, high waterproofing qualities, ease of installation and a relatively low price.

Polyethylene film for foundation waterproofing

For small structures with a low load on the foundation, polyethylene film can be used as the main horizontal waterproofing. Polyethylene - an inexpensive material, resistant to moisture and mold, to temperature changes. The only thing that "polyethylene film" is afraid of is ultraviolet radiation, when exposed to direct sunlight, the polyethylene is destructured in a few years. In addition, polyethylene often damage rodents. Therefore, it is advisable to use it as a waterproofing of the basement basement, or on top of the waterproofing to immediately arrange a concrete screed.

Film foundation waterproofing technology

1. The plotting of the plot is carried out and the foundation pit and sand cushion for the tape or slab foundation are prepared. The thickness of the sand cushion depends on the type of soil in the area: for puchynistyh soils its thickness should be at least 0.5 meters, for hard soils not prone to seasonal movements - about 10 cm. The sand pillow redistributes the load of the building onto the ground, drains the water from the foundationand protects the film from mechanical damage.
   

   Perform the marking of the

2. section. Do the formwork from the plank board, collecting it with bars and screws or nails so that the fastening elements are on the outside of the formwork. This will help not to damage the film and it is easier to remove the formwork. On the outside, the formwork is supported by slopes from a bar or planks.
   

   Do formwork from the wood board

3. In the prepared pit lay a polyethylene film, with the strip laid with an overlap of at least 20 cm, and the joints are glued with mounting double-sided tape. The edges of the film must be at least 10 cm above the formwork. Calculate the reinforcement, make the reinforcement from the rod of the calculated cross-section. To fasten the reinforcement, use a soft annealed wire and a hook for binding the reinforcement.
   

   The process of laying a polyethylene film for waterproofing

4. Mix concrete: 1 part of cement and 2 parts of sand are mixed, diluted with water to the state of liquid sour cream and poured 1-2 parts of small building gravel. To improve the waterproofing properties, it is possible to add a mixture to the concrete solution for penetrating waterproofing.
   

   Mixing process for

5. mortar Concrete is thoroughly mixed and poured into the prepared formwork. Level the mirror of the concrete level. If the height of the foundation is significant, a deep vibrator is used to remove air bubbles. Metal objects can not be used for this purpose, since there is a danger of damaging the polyethylene film.
6. The film allows the concrete to ripen evenly, preventing it from losing moisture through the ground. Formwork can be removed after setting the concrete, a few days after pouring. After removal of the formwork, the foundation is kept unloaded for 2-4 weeks until the concrete matures. To protect it from drying, you can cover the foundation with a layer of covering material on top.
7. Backfill is made with a soft primer, eg sand, to avoid damage to the film. If a thermal insulation of the foundation is planned, then it should be made to glue mortars, without damaging the waterproofing layer.

Horizontal waterproofing of foundation for concrete screed

Such waterproofing is most often performed on a slab foundation, when a monolithic concrete slab serves both the base of the building and the floor of the lower floor. In this case, it is necessary to waterproof the foundation not only from groundwater, but also from leaks of pipes, sanitary devices. If polyethylene film is used as a waterproofing material, then a concrete screed is applied over it.

1. Filled slab foundation and waiting for full maturation of concrete. Determine the availability of concrete can be as follows: at night, the foundation area is covered with polyethylene, and if condensation forms on the film by the morning - the concrete is not sufficiently dried. After full maturation of the concrete, it is possible to start the erection of walls and waterproofing of rooms with high humidity. If necessary, level the surface: remove the protrusions, cut the protruding reinforcement, the shells in the concrete are rubbed with a cement-sand mixture.
   

   Pouring of slab foundation

2. On the concrete lay a layer of non-woven geotextile, and on top of it - polyethylene film. Geotextile creates a soft substrate, protecting the film from damage. The overlapping of the strips of material - not less than 20 cm, the joints are glued with the help of mounting tape. If the waterproofing is carried out in separate rooms, the film is bent to the walls to a height of at least 10-15 cm. A damper tape must be laid between the film and the wall.
   

   A geotextile layer and a plastic film

3. are laid on the foundation. A concrete screed is placed on top of the polyethylene film, using ready-made mixtures for the implementation of the rough floor. After the screed has dried, you can start finishing work.

Waterproofing the foundation with a membrane film

This is a more expensive way of film waterproofing, but it has a lot of advantages. In addition to excellent waterproofing properties, membrane films have a vapor permeability, which allows moisture to be drawn from the basement to the outside. They are strong, resistant to the influence of chemically aggressive groundwater, to the germination of the roots. Rolled waterproofing with membrane films is a modern and very reliable way to protect the foundation from groundwater and atmospheric moisture.