How to protect a ground-floor flat from damp
Damp in a ground-floor flat comes up from below and in from the sides, and protection is built in three layers: waterproofing, drainage and a ventilated floor. A cosmetic renovation without them leaves stains after a season or two. Without them finishes spoil quickly.
What is done. The floor is opened and checked for waterproofing under the screed. A ventilated void or a dry bed with a membrane is built so moisture does not rise by capillary action. Along walls in contact with soil or the courtyard, drainage and waterproofing go on the outside if access allows; on the inside, breathable renders and ventilation. The new floor uses materials that tolerate residual moisture: stone, porcelain, and parquet only on a prepared base.
Requirements for moisture protection are set by section DB-HS of the Technical Building Code (CTE): the required waterproofing grade depends on the water table level and the soil permeability. The project and survey determine which grade applies to you.
What drainage and waterproofing a courtyard needs
The courtyard must carry water away from the house, not towards it: floor falls away from walls, storm gratings and a drain pipe along the wall. If water stands against the facade, it will find its way in.
The build-up. A paving fall of 1 to 2% away from the house. Channels or linear grates at glazed boundaries. A drain pipe in gravel around the perimeter, connected to a chamber or the storm sewer. Waterproofing at the junction of the courtyard floor and wall, turned up to a suitable height. An entrance threshold above courtyard level so storm water does not come in.
If the courtyard sits below street level, rainwater has to be pumped: a sump with a pump and a non-return valve on the drain, so that when the sewer is overloaded water does not flow back. It is one of those items forgotten until the first heavy rain.
How to create privacy in the courtyard
Privacy in a ground-floor courtyard comes from three layers: boundary height, planting and overhead screens. Neighbours look down from above, so protection from sightlines is needed in the vertical plane too.
What works. Walls and enclosures of enough height, finished in render, timber or stone. Living hedges and green walls, which grow quickly and need little soil. A pergola, louvres or an awning blocking the windows above. Sliding glass panels at the flat's entrance that do not cut light. Soft uplighting instead of bright floodlights so the courtyard cannot be seen into at night.
Anything above wall height should be checked against building rules and the community's statutes: sometimes the courtyard is a common element with exclusive use, and its appearance cannot be changed without consent. The courtyard's status is checked before the sketch.
Trees, roots and light
A tree in the courtyard gives shade and privacy, but roots and crown can damage foundations, drainage and services. The species and planting spot decide whether the tree is an asset or a problem.
In practice. Large trees are planted no closer than their roots allow: crown and roots spread wider than they look at the nursery. Near the house, small trees and shrubs work better: ornamental olive forms, citrus, Japanese maple in pots, bamboo in containers with a root barrier. An old tree beside a wall is checked for lean and roots, especially if cracks have appeared. Fallen leaves clog channels and grates and need regular clearing.
For light in a ground-floor flat, pale courtyard finishes, reflective or matt surfaces, floor-to-ceiling glazing and evening lighting all count. The courtyard becomes an interior room, especially if lit at eye level rather than from floodlights above.
A pool in the courtyard and the entrance
A small pool or plunge tub in the courtyard is possible if the courtyard's status, loads and planning rules allow it. In practice a cooling plunge pool is more common than a full swimming pool.
What to check. Whether the courtyard is entirely yours or a common element with exclusive use. Whether the local plan permits a pool on that plot and in that zone. Whether the base can carry the water's weight and that there is no basement or service line underneath. How to organise filtration and draining so neighbours are not bothered by noise or smell. How to protect the water from leaves and from children.
Entrance and security. For a ground-floor flat, access from the courtyard and from the street is a risk point: a reliable door with multi-point locking, a video entry system, sensors and lighting. Gates opening onto the street are designed with noise and sightlines in mind. These decisions are made together with the interior, not after it.
How we run such flats
A ground-floor flat with an interior garden first needs a survey of damp and of the courtyard's condition, and only then the interior. Start with finishes and the damp and water will come back.
BCN YARD runs these projects in Russian and Spanish, with one person responsible. We visit, measure, survey the base and prepare a staged estimate. We work with our own crew and vetted subcontractors, with payment under contract and by stage. Premium renovations start from 3,000 EUR/m2 excluding VAT at the Luxury level; the exact price comes in the estimate after the visit.
For the interior courtyard we treat the garden as an extension of the living room: floor in the same stone or a close tone, evening light, a green screen and warm lighting. That way the courtyard works as a room rather than a back yard.
Frequently asked questions
How can I protect a ground-floor flat from damp?
You need waterproofing under the screed, drainage along the walls and a ventilated void or dry bed with a membrane. Floor materials are chosen to tolerate residual moisture. The protection grade depends on the water table and soil and is set by the design.
How do I create privacy in a ground-floor courtyard?
With three layers: high walls or enclosures, a living hedge and green wall, and overhead a pergola, louvres or an awning against windows above. Soft lighting rather than floodlights in the evening. In the evening warm light and potted plants give privacy without solid fences that darken the courtyard.
Can I put a pool in a ground-floor flat's courtyard?
A small one, yes, if the courtyard is yours, the plan allows it, the base can carry the water and there is no basement below. If the courtyard is common with exclusive use, the community's agreement is needed. A plunge tub is more usual than a full pool.
What do I do with rainwater in the courtyard?
A floor fall of 1 to 2% away from the house, linear grates, a drain pipe in gravel and an outlet to a chamber or storm sewer. If the courtyard sits below the street, add a sump with a pump and a non-return valve on the drain.