Flat Roof Waterproofing in Varna and nationwide in Dobrich
We provide a long-lasting and reliable solution against flat roof leaks by installing latest-generation synthetic TPO and PVC membranes or proven SBS-modified.
About this service
We provide a long-lasting and reliable solution against flat roof leaks by installing latest-generation synthetic TPO and PVC membranes or proven SBS-modified bituminous systems. We specialize in projects from 50 to over 5000 m², with starting prices from 19 €/m² excl. VAT. A standard 300 m² project is completed in 7-9 working days, and we provide a written 15-year warranty for all our systems.
За обекти в Добрич планираме работата според открития терен, ветровото натоварване и достъпа в райони като Балик, Дружба, Изгрев, Рилци. Офертата отчита реалните условия на място, нужната подготовка и устойчивостта на изпълнението във времето.
What we deliver and which problem we solve
What we deliver
Infra Remonti EOOD performs comprehensive flat roof waterproofing for a wide range of clients, including condominium associations of residential blocks (panel, EPC, brick built), owners of industrial buildings, logistics centers, commercial properties, and private homes with modern architecture. Our scope of activity covers the entire country, with a focus on Varna, Burgas, Plovdiv, and Sofia, adapting our technology to specific climatic conditions. For coastal areas like Varna and Burgas, where the aggression from salt and UV radiation is high, we mandatorily apply membranes with enhanced UV stabilization and resistance to salt spray, such as Sika Sarnafil® TS 77 or Bauder THERMOFIN. In areas with large temperature amplitudes like Sofia and Plovdiv, we emphasize materials with high elasticity at low temperatures (down to -30°C), such as SBS-modified bituminous membranes or high-quality TPO membranes. Our team uses specialized equipment, including Leister VARIMAT V2 automatic welding machines for perfect seams and manual tools for precise detail treatment, ensuring a homogeneous and completely watertight system. Our process includes a thorough analysis of the substrate, precise preparation, and strict adherence to the manufacturer's technological requirements.
Which problem we solve
The main problem we solve is water penetration through compromised flat roofs, leading to a cascade of costly damages. Untimely or poor-quality waterproofing is a direct cause of leaks, moisture, and mold on the ceilings and walls of top-floor apartments, which not only deteriorates the living environment but also poses a health risk. Water infiltration slowly but surely destroys the load-bearing structure – penetrating the concrete, it causes corrosion of the reinforcement, which reduces the structural integrity of the building. Equally serious is the wetting of the thermal insulation layer. Just a few percent of moisture in mineral wool or EPS can reduce its thermal resistance (R-value) by over 50%, rendering the investment in thermal insulation pointless. This leads to higher heating and cooling bills. Our professional waterproofing system creates a monolithic, seamless barrier that eliminates these risks. We prevent financial losses from periodic partial repairs, interior damage, compromised insulation, and most importantly – costly structural repairs in the future. Investing in quality waterproofing today is a guarantee against much greater expenses and problems tomorrow.
Do you see damp patches on the ceiling or flaking plaster?
Don't wait for the problem to escalate. Call +359 88 654 0238 for an urgent free inspection and prevention of greater damage.
What does our flat roof waterproofing service include?
Every stage of the process is designed for maximum durability and security, with full transparency for the client.
Technical inspection and diagnostics
We perform a thorough examination of the existing condition, using not only visual inspection but also digital moisture meters and, if necessary, a thermographic camera. This allows us to identify hidden problems under old layers and pinpoint the exact source of leaks, not just their visible manifestations.
Full substrate preparation
This step is critical. We mechanically remove all old, compromised, and unsound waterproofing layers. We clean the substrate to a sound surface, grind the concrete for better adhesion, and fill all cracks and unevenness with specialized repair mortars to provide a perfect base for the new system.
Application of system primer
We apply a specialized primer compatible with the selected waterproofing membrane (e.g., Sika Concrete Primer or bituminous primer). This step is not skipped because it ensures a strong chemical and mechanical bond between the substrate and the waterproofing, preventing detachment and blistering.
Installation of vapor barrier
When constructing a warm roof, we mandatorily install a vapor barrier layer (most often polyethylene film with a thickness of ≥ 0.2mm with taped joints). It prevents moisture from entering the thermal insulation layer from the building's interior, which would lead to condensation and compromise the entire roofing system.
Mechanical fastening of the system
We use telescopic anchors and fasteners from certified manufacturers (such as EJOT or Rawlplug) to secure the thermal insulation boards and/or waterproofing membrane. Their number and arrangement are calculated according to the wind load for the specific region, which is extremely important for coastal cities like Varna.
Installation of main waterproofing membrane
We precisely cut and lay the selected membrane (TPO, PVC, or SBS bituminous) in compliance with the manufacturer's required overlaps of the rolls – typically between 80 and 120 mm. Correct positioning is crucial for subsequent high-quality seam welding and proper water drainage.
Automated seam welding
We use Leister VARIMAT Swiss robots, which weld joints with hot air at computer-controlled temperatures (around 450-600°C) and speed. This creates a homogeneous, monolithic bond that is stronger than the membrane itself and impossible to achieve with manual welding over long sections.
Treatment of critical details
We pay the utmost attention to details – drains, ventilators, chimneys, parapets, and corners. All of these are processed manually with precise tools and additional reinforcing elements, as statistically over 90% of leaks originate from carelessly executed details.
24/48-hour water load test
Upon completion of the system, we block the drainage outlets and flood the entire roof with a layer of water for a period of 24 to 48 hours. This 'flooding test' is the uncompromising way to prove 100% watertightness of the system before handing over the site and issuing the warranty.
Issuance of 15-year written warranty
After a successful test and final cleaning of the site, we provide the client with an official document. It includes a full description of the work performed, the materials used with their batch numbers, and the clear terms of our 15-year warranty, which covers both labor and materials.
Our 8-step work process
From initial contact to warranty issuance, we follow a clear and proven procedure.
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Step 1: Initial consultation and free inspection
After your call to +359 88 654 0238, our technical specialist will contact you to arrange a suitable day and time for an inspection. On-site, they will conduct a full roof inspection, take precise measurements, assess the condition of the substrate, and discuss possible solutions and materials with you.
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Step 2: Preparation of technical proposal and offer
Within 2-3 working days, you will receive a detailed offer. It will describe the specific waterproofing system (e.g., Sika TPO with mechanical fastening), the exact brands and models of all materials, a breakdown of activities, a clear timeline for execution, and a final price excluding VAT under a 30/40/30 payment scheme.
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Step 3: Agreement and material delivery
Upon approval of the offer, we sign a contract, and upon receipt of the 30% advance payment, we immediately order and organize the delivery of all necessary materials. On-site, we prepare the work area, adhering to all safety standards and minimizing inconvenience for residents.
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Step 4: Dismantling old layers and substrate preparation
We begin by completely removing all compromised waterproofing and insulation layers down to a sound substrate. This is followed by the removal of construction waste, meticulous cleaning of the concrete slab from dust and unstable particles. If necessary, minor repairs to the substrate are also performed.
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Step 5: Installation of vapor barrier and thermal insulation (if provided)
For a 'warm roof' project, a vapor barrier layer is laid first. On top of it, thermal insulation boards (XPS or PIR) are arranged and mechanically fastened to the substrate with anchors. This operation is performed with great care to avoid thermal bridges and ensure proper slope to the drains.
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Step 6: Installation of the waterproofing membrane
The waterproofing rolls (TPO, PVC, or bituminous) are unrolled and positioned according to the technical design. For mechanical fastening, the fasteners are installed in the overlap area before welding. For fully adhered systems, a special adhesive is applied. We ensure correct tensioning of the membrane.
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Step 7: Seam welding and detail formation
This is the most critical stage. Long straight seams are welded with an automatic Leister machine. All other details – corners, drains, ventilators, parapets, air conditioner bases – are processed and welded manually by experienced specialists to guarantee 100% watertightness of the entire system.
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Step 8: Final inspection, test, and site handover
We conduct a thorough visual inspection of every centimeter of the welds. We perform a mandatory 24-hour ponding test. After its successful completion, we clean the site and hand it over to the client with the signing of a handover protocol and the delivery of the written 15-year warranty against the final 30% payment.
Are you ready for a leak-free roof for the next 15+ years?
Contact the Infra Remonti EOOD team for professional consultation and a personalized offer.
Why do clients choose Infra Remonti for flat roof waterproofing?
Our approach is based on engineering precision, quality materials, and full responsibility for committed engagements.
- We use automatic Leister welding machines, guaranteeing 100% homogeneity and strength of the seam along its entire length, eliminating the risk of human error.
- Our 15-year written warranty is a legally binding document covering both labor and materials, providing you with complete peace of mind.
- We specialize in systems resistant to the aggressive climate in Varna, applying membranes with the highest class of UV protection and resistance to salt aerosols.
- Our pricing is transparent, starting from 19 €/m², with a fixed quote before work begins and no hidden costs afterward.
- We conduct a mandatory 24-hour ponding test ('water test') on every new roof to certify the absence of any leaks before handover.
- All details around ventilation pipes and parapets are executed with factory-moulded elements or additionally reinforced layers, as these are the most common cause of problems.
- We are certified applicators for leading European manufacturers such as Sika®, Bauder® and Mapei®, ensuring adherence to technologies and validity of material warranties.
- During design, we calculate and create the necessary slopes towards the drainage elements, preventing water retention (puddles), which accelerates membrane aging.
- We provide the client with detailed photographic material from each stage of work – from substrate preparation to final welds, for complete transparency.
- We work according to a proven and secure 30/40/30 payment scheme, linking payments to the actual execution of key project stages.
- We integrate high-density, closed-cell XPS or PIR thermal insulation boards that retain their thermal insulation properties long-term.
- Our team undergoes regular training directly from material manufacturers to stay abreast of the latest technologies and work methods.
Materials we work with
We select only certified materials from leading European manufacturers that have proven their effectiveness and durability in real-world conditions.
TPO membrane (e.g., Sika Sarnafil® TS 77-15)
Thermoplastic polyolefin, reinforced with polyester mesh, 1.5 mm thick. This material is a benchmark for environmental friendliness and durability. It contains no plasticizers, which prevents cracking and hardening over time. It has exceptional resistance to UV radiation and weathering, making it ideal for exposed roofs in sunny regions like Varna. It is easily hot-air welded, creating seams stronger than the membrane itself. Fire reaction class Broof(t1). Service life over 30 years.
PVC membrane (e.g., Mapei Mapeplan T M 15)
Polyvinyl chloride membrane, polyester reinforced, 1.5 mm thick. PVC membranes have over 50 years of history and have proven their reliability. They are characterized by high mechanical strength, puncture resistance, and excellent dimensional stability. They contain special UV inhibitors and flame retardants. Suitable for roofs with intensive traffic or presence of chemical agents. Extremely strong welds and a wide range of system accessories make them a versatile solution for complex roofs.
SBS-modified bituminous membrane (e.g., BMI Icopal/Villas Elastobit PV S52)
Premium bituminous membrane, polyester reinforced, over 5.0 mm thick (for top layer). SBS (Styrene-Butadiene-Styrene) rubber, added to the bitumen, provides exceptional elasticity even at very low temperatures (flexibility down to -25°C), making it a perfect choice for areas with harsh winters like Sofia. It is typically applied as a two-layer system with a total thickness of 8-9 mm, providing immense resistance to mechanical damage. Application is done by torch-on welding.
Extruded polystyrene (XPS) thermal insulation (e.g., Fibran XPS 300-L)
Rigid thermal insulation boards with a closed-cell structure, making them practically watertight (water absorption < 0.7%). They have high compressive strength (≥300 kPa), allowing them to be used on loaded and inverted roofs. Their thermal conductivity coefficient (λ) is excellent, around 0.034 W/mK. XPS retains its thermal insulation properties long-term, even in the presence of moisture, making it a reliable choice for any roof.
Polyisocyanurate (PIR) thermal insulation (e.g., BauderPIR FA)
Rigid thermal insulation boards with the best thermal insulation characteristics on the market, with a thermal conductivity coefficient (λ) reaching up to 0.022 W/mK. This allows achieving the required energy efficiency standards with less insulation thickness. PIR boards are lightweight yet have high compressive strength. They also have significantly better fire performance compared to other polymer thermal insulation materials. They are often laminated with aluminum foil, which also serves as a vapor barrier.
Mechanical fasteners (e.g., EJOT DDS-T / DDP)
A system of telescopic anchors made of polypropylene and steel, corrosion-resistant screws, specifically designed for fastening thermal insulation and waterproofing membranes. Their telescopic design eliminates thermal bridges through the fastener. Their number, type, and length are determined after engineering calculation of wind load according to Eurocode, considering the building's height and geographical location. Correct selection and installation are critical for roof safety.
Types of properties we specialize in
Our technology and experience are applicable to almost any type of building with a flat roof.
Frequently asked questions
Related services in Roof repair
Ensure your security and peace of mind with a sound roof over your head
Every leak is a threat to your property and comfort. Do not compromise on quality. The Infra Remonti EOOD team is at your disposal to offer a long-lasting, technically sound, and guaranteed solution for your flat roof waterproofing. Contact us today at +359 88 654 0238 to request your free inspection and receive a no-obligation quote. Let us together find the best solution for your property and put an end to leak problems once and for all.
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Every leak is a threat to your property and comfort. Do not compromise on quality. The Infra Remonti EOOD team is at your disposal to offer a long-lasting, technically sound, and guaranteed solution for your flat roof waterproofing. Contact us today at +359 88 654 0238 to request your free inspection and receive a no-obligation quote. Let us together find the best solution for your property and put an end to leak problems once and for all.
☎ 088 654 0238