Alicante province
Terrace Waterproofing in Alicante — Stop Leaks and Damp for Good
Terrace waterproofing in Alicante is the most requested repair on the Costa Blanca: leaks, water ingress and damp reaching the flat below. We seal terraces, flat roofs and balconies with liquid or sheet membranes, improve drainage and re-lay tiling, all with a 2-year guarantee.
Free quote
Same-day response. No obligation.
- Area
- Alicante & province
- Quote
- On request, no obligation
- Guarantee
- 2 years
- Timescale
- Balcony or small terrace waterproofing: 2–4 days.
On coastal villas and apartments, the terrace or flat roof is usually where water gets in first. Sun, salt and temperature swings break down old bitumen felt, and damp patches, flaking paint and drips appear in the property below. We find where the water is actually coming in before touching anything.
We use two systems depending on the job: liquid polyurethane membrane, ideal for walk-on terraces with complex shapes and several drains, and sheet membrane for larger flat roofs. In both cases we reinforce the upstands, gullies and parapets, which is where waterproofing almost always fails.
When the terrace is tiled, we assess whether to waterproof over the existing floor or lift and renew the tiles. We explain both routes with their timescales and guarantee so you can decide with full information, even from abroad via photos and a video call.
Terrace Waterproofing in Alicante: what's included
Leak-source diagnosis
We inspect the terrace, drains and junctions to pinpoint where the water is really entering.
Liquid polyurethane membrane
A seamless, continuous coating for walk-on terraces with awkward shapes.
Sheet membrane
Installation of waterproof sheeting for larger flat roofs and rooftops.
Gully and parapet reinforcement
Sealing the critical points where waterproofing typically breaks down.
Drainage and fall correction
We correct falls and enlarge outlets so water drains away instead of pooling.
Tile reinstatement
We relay or renew anti-slip tiling so the terrace is ready to use again.
The full scope of Terrace Waterproofing works
Every job we take on within this service, with the detail of how we carry it out. The price is always fixed after the survey.
Leak diagnosis
Leak into the flat below
- What we do
- We work out exactly where water is entering your terrace to reach the property underneath.
- How we do it
- The stain is almost never under the entry point — water tracks along the slab until it finds a way out. We flood the terrace in sections, blocking gullies one at a time until the drip returns, which pins down the spot without chasing walls blindly.
Water-tightness test
- What we do
- A water test to establish whether the terrace holds or leaks, before and after the works.
- How we do it
- We plug the outlets and hold standing water for 24–48 hours while watching the ceiling below. We repeat the same test on completion — it is what stands behind the guarantee.
Gully and parapet survey
- What we do
- Inspection of the detail points where most waterproofing fails.
- How we do it
- We lift the gully grate and open up the junction with the parapet. This is where old bitumen felt debonds or splits with building movement, and where water gets in without warning.
Ponding after rain
- What we do
- Diagnosis of terraces that hold water for days after a downpour.
- How we do it
- We check the fall with a laser level from every point to the outlet. Standing water means the fall is too shallow or the gully sits too high, and no membrane survives indefinitely under a permanent puddle.
Report for community or insurer
- What we do
- A document setting out the source of the leak and the repair needed.
- How we do it
- We provide photographs, the test carried out and the scope itemised. It is what the administrator or loss adjuster normally asks for to decide whether the damage falls to the owner or to communal elements.
Substrate preparation
Stripping spent bitumen felt
- What we do
- We lift the old waterproofing once it has reached the end of its life.
- How we do it
- Felt from the 1980s and 90s goes brittle under the sun here and cracks underfoot. We strip it out completely and take it to a licensed disposal point, rather than layering over the top and trapping moisture underneath.
Lifting existing tiles
- What we do
- Removing the floor when it is loose or in the way of correcting the fall.
- How we do it
- If the tiles sound hollow or the fall is wrong, lifting them is the only honest answer. When they are sound and well levelled, we propose waterproofing over the top and saving you the disruption.
Forming the falls
- What we do
- Correcting the run-off towards the outlet before any membrane goes down.
- How we do it
- We lay lightweight screed to form the fall to each gully and prove it with water before the membrane goes on. Waterproofing over a bad fall only postpones the problem.
Levelling and fillets
- What we do
- Making good cracks and coving the junction between floor and upstand.
- How we do it
- We repair cracks and form a fillet at every vertical junction. A membrane cannot turn a sharp right angle without stressing, and that angle is exactly where it eventually splits.
Priming the substrate
- What we do
- Preparing the concrete or tiling so the membrane genuinely bonds.
- How we do it
- We apply the right primer for the substrate, with the moisture content measured first. A membrane over dusty or damp concrete debonds in its first hot season.
Waterproofing systems
Liquid polyurethane membrane
- What we do
- A seamless, continuous coating for walk-on terraces with awkward geometry.
- How we do it
- We apply liquid polyurethane in two cross-laid coats over primed and filleted upstands, with reinforcing fleece at junctions. With no laps, it is the answer for terraces full of corners, gullies and pipe penetrations.
Sheet membrane
- What we do
- Sheet waterproofing for larger flat roofs and rooftops.
- How we do it
- We torch or hot-air weld the laps and probe each one individually. Over a large area sheet outperforms liquid on both cost and speed, provided every detail is finished with its proper preformed piece.
Waterproof render on balconies
- What we do
- A low-build solution for balconies where the floor level cannot rise.
- How we do it
- We use a flexible two-part cementitious membrane that adds barely any height and takes tiling directly on top. It is the right call when the door threshold leaves no headroom to play with.
Membrane under new tiling
- What we do
- A concealed membrane beneath the floor when the terrace surface is being renewed.
- How we do it
- The membrane goes over the formed fall and the tiles are bedded on flexible adhesive with open joints. That keeps the membrane out of the sun, which is what degrades it fastest here.
Walk-on UV topcoat
- What we do
- The final layer protecting an exposed membrane from the Costa Blanca sun.
- How we do it
- We seal the polyurethane with a UV-stable aliphatic topcoat, with anti-slip aggregate in walkways. Without it the sun here crazes the membrane within a few summers, however well the system was laid.
Details, drainage and handover
Gully reinforcement
- What we do
- Sealing and renewal of the point the terrace actually drains through.
- How we do it
- We fit a lead or EPDM gully with a flange, sandwiched between the membrane layers. A gully held in with silicone alone is the repair we redo most often for other people — silicone does not last two seasons here.
Increasing drainage capacity
- What we do
- More outlet capacity for the torrential rain this coast gets.
- How we do it
- A gota fría dumps in an hour what the terrace normally sees in months. We add an extra gully or an overflow through the parapet so that if the main outlet clogs with leaves, water escapes outside rather than under your door.
Parapet and coping details
- What we do
- Sealing the junction with the perimeter wall and its coping.
- How we do it
- We take the membrane at least 15 cm up the upstand and terminate it in a chase or under the coping with a drip. A membrane cut off flush is exactly where rain driven by the levante wind gets in.
Door and pipe penetrations
- What we do
- Sealing service penetrations and the threshold into the property.
- How we do it
- We reinforce every penetration with elastic banding and detail the threshold with a profile and drip edge. This is the critical point on balconies, where there is barely any step between terrace and living room.
Reinstating the floor
- What we do
- Relaying or renewing anti-slip tiling over the finished membrane.
- How we do it
- We lay class-3 anti-slip tiling with open joints and a perimeter movement profile, or raised paving on pedestals where keeping access matters. In a community we match the approved tile so the building frontage stays uniform.
Terrace Waterproofing in Alicante step by step: how we work
- 1
Site visit
We locate the leak and check the drains with no obligation.
- 2
Fixed-price quote
We set out the system, items and timescale in writing.
- 3
Works
We prepare the substrate, apply the membrane and water-test it.
- 4
Handover with guarantee
A flood test and a written 2-year guarantee.
Timescales for Terrace Waterproofing in Alicante
- Balcony or small terrace waterproofing: 2–4 days.
- Walk-on terrace with liquid membrane: 4–7 days.
- Flat roof with sheet membrane and re-tiling: 1–2 weeks.
Pricing your Terrace Waterproofing in Alicante: how we quote
Every project is unique: the price fits your job.
We do not use one-size-fits-all price lists. After a free, no-obligation site visit we prepare a detailed personalised quote, with a fixed price agreed before we start.
Terrace Waterproofing in Alicante: before & after
Terrace leaking to the flat below
Torrevieja
Liquid membrane over a 35 m² terrace after tracing the leak to the gully. Drips gone for good.
Apartment-block flat roof
Alicante centre
Renewed sheet membrane and outlets on a rooftop, with a new raised paving finish.
Terrace Waterproofing: customer reviews in Alicante
“Professional approach to renovation and construction services. The communication is clear, the team pays attention to details, and the overall presentation gives a good impression of reliability and quality.”
“A very good professional service with a strong focus on the customer. Communication was clear and all questions were handled quickly. Overall, I had a very positive experience and would be happy to recommend Renixo.”
“Дякую за прекрасну роботу та виконання мого замовлення.”
Terrace Waterproofing: frequently asked questions in Alicante
How much does terrace waterproofing cost in Alicante?
The price depends on the square metres, the system (liquid or sheet membrane), the condition of the substrate and whether the existing tiles must be lifted. Every terrace is different, so we fix the price after the site visit. Request a free, no-obligation quote.
Do you have to lift the terrace floor?
Not always. If the tiles are sound and well levelled, we can often waterproof over the top with a liquid membrane. If the floor is loose or the fall is wrong, lifting it is the right call. We assess this on the visit.
How do you find where the water gets in?
We inspect the terrace, gullies, parapets and junctions, which are the points that fail most often. Damp rarely shows directly under the leak, so we trace the true source first and only then repair it properly.
What guarantee do you give?
Every waterproofing job includes a written 2-year guarantee on the workmanship. Before handover we carry out a flood test with water to confirm the terrace is fully sealed and no water is getting through.
Can you manage the job if I live overseas?
Yes. We work with many non-resident owners. We survey the terrace, send a detailed quote by email and share photo and video reports at each stage, so you can approve the work and see progress without being on site.
Terrace Waterproofing in Alicante town by town
Terrace Waterproofing: the areas we cover
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