Here you are method statements related to waterproofing
Kimia proposes waterproofing cycles applied on balconies, terraces and on new or existing roofs, even without removing old ceramic tiles or waterproofing membranes. We also offer waterproofing solutions for tanks and pipes of water supply, underground structures. In particular, pls find description of our interventions for the following applications:
► Waterproofing of balconies and terraces
► Blocking of water seepages
► Waterproofing of basement walls and tanks
► Waterproofing of drinking water tanks
Waterproofing of balconies and terraces
Preliminary operations
Clean the substrate in order to totally remove the inconsistent or flaking parts. A proper cleaning is also useful to remove dust, grease, rust, paint and any other material which may affect the adhesion of coatings. After cleaning the surfaces, verify the dectivity and if necessary fix it in order to avoid water stagnation. Verify the presence of adequate systems for the collection and disposal of water.
If the balcony is delimited by walls and not by railings, implement through holes on the walls. Remove or lift from the ground obstacles (splitters and other elements) or non-structural element.
In the case of a bituminous membranes, evaluate whether to proceed with the removal of the membrane, or with localized renovation. The removal is the most convenient operation to be done when most of the existing membrane is deteriorated.
In case of concrete surfaces, make sure that the substrate is structurally sound. The "pull off" tensile strength of the concrete must be > 1.5 MPa. It is then necessary to check the presence and depth of possible cortical degradation and proceed to a concrete renovation cycle. Eliminate any metal spacers and level deep and extended irregularities with a skim coat. In case of new concrete screeds, prime the surface with the epoxy resin Kimicover FIX MV with a roller or brush. This operation must be carried out between 8 and 24 hours before the beginning of the waterproofing.
In case of already tiled surfaces, remove the first row of tiles of the walls to a height of about 20 cm, check the adhesion to the substrate and repair any holes or irregularities. Clean the surface with Soluzione P cleaner applied with a roller, brush or floor machine. Once applied let it work for a few mins and rinse the treated surface with water.
Joints
If a proper grid of static and dynamic joints has been designed and implemented, then it is possible to proceed with the restoration of the edges and the replacement of the preformed devices previously applied over the joints, in case they are deteriorated. If there are natural joints, due to the an incorrect sizing of cuts of the screed, if the joints have a straight or almost straight line, enlarge them.
If the cracks are widespread and irregular, the surface must be restored before the joints are recreated.
If the tiled surfaces have no joints and it is necessary to create them, cut the grout lines using an angle grinder, trying to make joints in areas that might tend to act as dynamic joints.
To waterproof the joints:
- Place the Ethafoam polyethylene support at the end of the joint as a foundation for the polyurethane sealant Tecnoseal 88 or Tecnoseal 130 in case of joints larger than 5 mm.
- Apply a self-adhesive membrane (such as our Kimicover JOINT) and a reinforcing net (Kimitech 120) to be saturated with mortar or the waterproofing resin chooesen to waterproof the surface.
- The contact lines between the screed and the walls will be secured applying Kimicover JOINT on top of them, while collecting wells will be treated by applying a self-adhesive membrane, Kimicover JOINT P into the plumbing.
Waterproofing of the surfaces
Apply by roller a first coat of the mortar (Kimicover UNO, Kimicover DUO, Kimicover GUAINA) or resin (Kimicover 501, Kimicover LASTIC or Kimicover 601P), on wet place the reinforcing fabric Kimitech 350 (to be used with mortars) or Kimitech TNT (to be used with resins) and pour additional waterprrofing agent over the net to finish the waterproofing;
After 24-48 hours, apply by roller an additional coat of waterproofing mortar or resin.
Finishing
- Monochromatic occasionally walkable varnishing → Completed the curing of the last coat of waterproofing (avarage 7 days), proceed with the monochromatic elastic covering realized with Kimicover BLINDO (Kimicover 501, Kimicover LASTIC and Kimicover 601P do not need any protection).
- Bonding of the tiles (this option is not available in case of waterproofing with Kimicover LASTIC or 501) → After at least 7 days from waterproofing, proceed with the bonding of the ceramic coating with Aderflex or Aderflex KR glue. Expansion joints in the coating shall correspond to expansion joints in the substrate, Joints will be subsequently grouted with a suitable Tecnoseal sealant.
Blocking of water seepages
In case of underground structures subjected to negative pressures, create channels and collection and evacuation systems at points of arrival of water.
Carefully clean the cracks to be treated and enlarge them mechanically, removing any grease, flaky parts and any material which might affect good anchoring of the product.
Mix Betonfix WW a little at a time with clean water, wait until it starts to set (about 2 minutes, depending on the temperature) and press it against the crack or hole, maintaining pressure until it has completely set.
In the case of widespread seepage, apply the product as a powder and work it into the affected area, repeating until all leaks have been completely infilled. Work from top to bottom.
Waterproofing of basement walls and tanks
The existing coatings must be controlled, clean and mechanically sound and adherent. In case of poor adhesion to the substrate, they must be removed. Any holes or irregularities of the substrate must first be repaired with suitable Kimia products.
In the case of degraded substrates check the depth of degradation and repair. The concrete castings, properly seasoned, must be structurally sound (tensile pull off resistence > 1.5 MPa).
To remove dust, existing coatings, grease, rust, release agents, paint, cement laitance and any other substance or material which may affect the adhesion of subsequent coatings, clean the substrate thoroughly by sandblasting.
Saturate the substrate with water. Excess water must evaporate off, so that the substrate is saturated and the surface is dry (s.s.d. condition). Compressed air may be used to speed up this process.
The connections between walls and floor, joints, collection wells will be repaired and waterprooved applying Kimicover JOINT or Kimicover JOINT P.
Mix Betonfix 300 for about 5 minutes with water or Kimitech ELASTOFIX. Apply by brush, trowel or airless spray pump a first coat of the product. On wet place the reinforcing fabric Kimitech 350 and pour additional waterproofing agent over the net to finish the waterproofing.
After 24 - 48 hours, apply by roller an additional coat of Betonfix 300.
Waterproofing of drinking water tanks
The existing coatings must be controlled, clean and mechanically sound and adherent. In case of poor adhesion to the substrate, they must be removed. Any holes or irregularities of the substrate must first be repaired with suitable Kimia products.
In the case of degraded substrates check the depth of degradation and repair. The concrete castings, properly seasoned, must be structurally sound (tensile pull off resistence > 1.5 MPa).
To remove dust, existing coatings, grease, rust, release agents, paint, cement laitance and any other substance or material which may affect the adhesion of subsequent coatings, clean the substrate thoroughly by sandblasting.
Saturate the substrate with water. Excess water must evaporate off, so that the substrate is saturated and the surface is dry (s.s.d. condition). Compressed air may be used to speed up this process.
The connections between walls and floor, joints, collection wells will be repaired and waterprooved applying Kimicover JOINT or Kimicover JOINT P.
Mix Betonfix 300 for about 5 minutes with water or Kimitech ELASTOFIX. Apply by brush, trowel or airless spray pump a first coat of the product. On wet place the reinforcing fabric Kimitech 350 and pour additional waterproofing agent over the net to finish the waterproofing.
After 24 - 48 hours, apply by roller an additional coat of Betonfix 300.
Before applying Kimitech K40 AP, the epoxy finishing certified for contact with drinking water, wait for the complete seasoning of the waterproofing (at least 7 days). In case of closed tank, ensure a proper air circulation with cooling fan. The finishing can be applied with brush, roller, or airless gun in at least 2 coats.
The second coat must be applied within the time stated in the TDS of the products.
Info & Technical Support
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Ing. Diego Aisa, Chief of Export Department
Hello! I am Diego Aisa, I am a structural engineer. I began working for Kimia in 2007. I manage international key contacts and I am Chief of Export Department. I like travelling and I got a thing for photography! Find here my contacts. My Linkedin profile.