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Protection against the humidity of the elevations in buried parts (habitable rooms)

The external protection of the buried walls depends partly on the destination of the subsoil they surround. The walls of premises where no trace of moisture is accepted are classified in 1st category. This is particularly the case of the walls of living rooms in the basement. As cinder block masonry is porous by definition, it is necessary to create a real impervious outer envelope and not to be satisfied with only a bituminous coating, if applied well it is. A waterproofing coating will be carefully spread on this wall before proceeding, once dry, to a coating with a bituminized finish.

Necessary material

  • Garden hose
  • Mason Rule
  • Float
  • Protective gloves
  • Trowel
  • Brush
  • Roller
  • Professional protection equipment

Steps

  1. Preparation
  2. Protection

Preparation

Jointing compound for vertical joints

Jointing compound for vertical joints

1. Check that the wall of the wall to be treated does not have unfilled joints (vertical mainly in thin joints) and seal with a fine mortar, those likely to create a significant rupture of sealing.

Patching the wrinkles

Patching the wrinkles

2. A cinderblock wall, especially if it is intended to be covered with embankments, does not always have perfect flatness. Correct and roughen the wrinkles (accentuated reliefs of a wall plan) in order to work on a wall as flat as possible.

Humidification of the support

Humidification of the support

3. Before manual installation or splashing, clean all traces of oil or mud and dust. Then pre-humidify the wall (the day before), especially for breeze blocks.

Protection

Application to the spear of the waterproofing coating

Application to the spear of the waterproofing coating

4. To achieve complete protection of the wall intended to be buried, a waterproofing coating is first applied to the previously moistened face. It can be projected with the lance (professionals) or troweled in traditional mode.

Application and manual priming of the waterproofing coating

Application and manual priming of the waterproofing coating

5. The waterproofing coating, whatever its mode of application, is then erected to the rule to compose a regular protective layer. The plaster body should have a thickness of 10 to 20 mm.

Finish the plaster to create a smooth and flat support

Finish the plaster to create a smooth and flat support

6. Tilt and smooth the surface in continuity of the application by proceeding by reduced surfaces. Finishing can be done during the open time of the product.

Bituminous finishing layer

Bituminous finishing layer

7. Let the coating dry for 48 hours always on a 20° temperature basis. Then apply a fluid waterproofing brush or roller in 2 crossed layers. Note that in a very humid environment the creation of a drainage system before the backfilling, can only be advantageous.

(photos / visuals: © Parexlanko, except special mention)

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