Right way waterproofing of strip Foundation of FBS blocks

External and external waterproofing of strip Foundation of FBS blocks

Waterproofing block foundations is much more complex and costly than waterproofing similar monolithic structures. This is due, primarily, with the presence of vulnerabilities in the construction of Foundation of FBS, such as interblock seams, which require additional processing and waterproofing. In this article we step by step look at the technology of waterproofing works of such foundations.

So, let's start..

Clean the surface before waterproofing

The main purpose of this stage is polnoy ochistka from dirt, dust, oil, old waterproofing, projections, loose particles, etc. the concrete surface. The sources are different, but the result is a completely clean and smooth concrete base.

Recommended cleaning methods:

  • dismantling a jackhammer (for large protrusions and particles)
  • grinding the concrete surface using diamond Cup
  • surface treatment high water pressure (250 ATM), we recommend you to use nozzle "Gidropress", in order to increase the strength of the jet.

Cutting the interblock joints and junctions

This stage is performed in parallel with the previous one, since the cutting of the joints is accompanied by a large amount of dirt and dust. So, in order to do the cleaning in the endless circle, we strongly suggest to combine these two processes together.

Before cutting, we recommend to determine the height of the waterproofing coatings from the floor level. Typically, this is done on a time-tested formula:
the ground level 40 cm

For a start, using a jackhammer to knock the cement composition of all interblock seams, in the field of waterproofing, to a depth of 30-40 mm. It is an indispensable step in external and external waterproofing works.

If the area of the planned waterproofing into the junction wall-floor, wall-wall, wall-ceiling, you need to make the chase, with a width of 30 mm and a depth of 30 mm for internal and external works.

Incorporation of the interblock joints and junctions

The previously prepared sutures and grooves at junctions, at this stage, it is necessary to seal sigprocmask non-shrink mortar with high adhesion Teknorep 300 or Teknorep 300 EX. If there are active water leaks, must be eliminated by using compositions Teknoplug Yildirim or Teknoplug. Time full cure of the compositions from 1 to 2 minutes respectively. The adjacencies are also doing a small fillet using the same material. This will significantly reduce pressure on waterproofing coating at the joint.

All the bumps and potholes as necessary to plaster mortar Teknorep 300 .

Waterproofing interblock joints and junctions

At this stage there is a certain duality. The water pressure outside the structure is positive and inside is negative. This means that from this point on, exterior and interior waterproofing work will be done different materials and different technologies perform.

Outside: To all seams and joints must be applied to two-component elastic waterproofing material Teknomer 200 EX. In these zones of possible small movements in the process of operation, it is therefore necessary to apply a hydrophobic material that will not only cover cracks but also to provide compensation advances.

Before applying the mixture, the area of waterproofing is necessary to moisten. Then prepared according to instructions solution Teknomer 200 EXshould be applied in 2 coats with roller, brush, or ceiling brushes. Wait 5-6 hours between coats depending on ambient temperature. Layers should be applied perpendicular to each other. The total application thickness 2-3 mm.

Inside: on the interblock seams and joints should be applied kristallizovannyj two component hydrophobic material Teknomer 200 Crystallized or Crystallized Teknomer 200 EX, which is designed for the negative pressure of water.

Waterproofing of communications

At this stage it is necessary to make sealing all inlets, pipes and other flow elements. Highly recommend to do it with bentonite cord 5 × 20 mm, on the basis of bentonite clay. For this is enough for the tube segment to make a few turns bentonite cord, placing it so that it was approximately in the middle of the structure. You must then seal the remaining space with the help of repair composition Teknorep 300 or Teknorep 300 EX. To do this, the entire surface around the input communications moisten and with a spatula very closely and carefully to fill the gap one of the above solutions.

Waterproofing of the Foundation walls FBS

Outside the rest of the surface of concrete blocks covered with Teknomer 200 EX (which we used for waterproofing the interblock joints) or Teknomer 200. The use of a particular material depends on the strength of the alleged water pressure on the structure. Apply the mixture in two layers perpendicular to each other. After complete drying of the solution, glue it to a slab of Styrofoam.

Inside: for internal use crystallized waterproofing is a two component hydrophobic mixture Teknomer 200 Crystallized or Crystallized Teknomer 200 EX, which is designed for the negative pressure of water.

Protection of the waterproofing coatings

Internal waterproofing made solutions Teknomer 200 Crystallized or Crystallized Teknomer 200 EX is ready for further processing within 3-7 days. But the slab of polystyrene to protect it with a spiky membrane almost immediately after gluing. For this we recommend to use a thorn membrane Sintar, with or without geotextiles (depending on the required degree of protection).

Olga Shulga