Technical flooring guide
Pisos Pro Medellín is a flooring specialist that installs and repairs residential and commercial floors in Medellín, Envigado, Bello and Eastern Antioquia. For more than 15 years we have been detailing joints, adhesives and edge finishes so floors can move with the building instead of cracking.
Here we explain what happens to each type of floor during an earthquake, how it should be installed to cope, and how to tell a surface crack from a structural warning sign.
Colombia's earthquake-resistant building code, the Reglamento Colombiano de Construcción Sismo Resistente (NSR-10), places Medellín in an intermediate seismic hazard zone. The Aburrá Valley also has seismic microzoning studies that adjust structural design to the soil in each sector.
The tremors (temblores) people feel in the city usually start far away, in regions such as Chocó, the Coffee Region or Santander. You can look up every recent event on the website of the Servicio Geológico Colombiano, the national geological survey.
For your floor, the practical consequence is that the slab and walls flex by a few millimeters with each quake. That movement, combined with concrete shrinkage and temperature swings, is what cracks a poorly detailed finish.
The key difference is whether the floor is bonded to the slab or floats on top of it.
A gap of 5 to 10 mm is left against walls, columns and door frames, later hidden by the baseboard. Without it, the floor pushes against the structure and lifts or cracks at the corners.
In large porcelain areas we cut joints and fill them with elastic sealant, typically every 25 to 36 m² indoors. They also go wherever the room changes shape, such as where a hallway opens into a living room.
These are never bridged with continuous tiles. The floor is cut exactly over the joint and finished with an expansion joint profile that allows movement.
For porcelain tile we use adhesives classified C2 S1 or S2, which accept small deformations without letting go. Brands such as Pegacor, Sika and Mapei offer lines like these, applied with double-buttering (adhesive on both the tile and the floor) so no voids are left.
If your building has recurring cracks, a floating floor such as SPC flooring is the most forgiving choice. If you prefer a stone-look finish, properly installed porcelain tile also works when it follows the details in this table.
| Floor | Tolerance | Detail that protects it |
|---|---|---|
| Floating SPC and laminate | High | Free perimeter expansion gap and transition profiles at doorways |
| Floating engineered hardwood | High | Expansion gap and an underlayment that lets it slide |
| Glue-down vinyl (LVT) | High | Flexible material; needs a slab without active cracks |
| Carpet | High | No special requirements |
| Small-format ceramic tile | Medium | Many grout joints spread the stress |
| Large-format porcelain tile | Low to medium | C2 S1 adhesive, double-buttering and joints every few meters |
| Natural stone and marble | Low to medium | Deformable adhesive and joints filled with elastic sealant |
| Poured-in-place terrazzo | Low to medium | Divider strips laid out in a grid |
| Microcement | Low | Reinforcing mesh and respecting the joints in the base |
| Polished concrete | Low | Control cuts made at the right time |
Mark both ends of the crack with a pencil and write down the date. If it has not grown after two or three weeks, it is most likely damage to the finish only.
If you notice any of the signs in the right-hand column, or cracks in exposed columns, beams or the slab, get a structural engineer's assessment first. Replacing the floor over an active problem only hides the evidence.
In an apartment building, notify building management (administración) so the board (consejo de administración) can arrange an inspection of common areas and the structure. If there is immediate danger, call the 123 emergency line.
Once you have the engineer's report, we repair the subfloor and the finish following their instructions.
No. A floor adds no seismic resistance; that depends on a structure designed under the NSR-10 code. What changes is how much the finish gets damaged and how much it costs to repair.
Our 1-year workmanship warranty covers installation failures such as hollow tiles from poor adhesion or open seams. It does not cover damage caused by earthquakes or by structural settlement.
We check for hollow tiles, joints and edge finishes, then tell you whether a floor and subfloor repair is enough or the area should be redone with proper joints. If the damage is in a seamless finish, we also assess your microcement.
Pisos Pro Medellín
Tv. 6 #45-115, El Poblado, Medellín, Antioquia, Colombia
Monday to Saturday: 7:00 a.m. to 9:00 p.m.
Sunday: 9:00 a.m. to 9:00 p.m.