Windows & Doors

## Professional PVC & Aluminum Window and Door Solutions

Trading Build Engineering delivers comprehensive supply, installation, and replacement services for PVC and aluminum windows and doors across residential, commercial, and industrial properties. We partner with proven European profile systems and employ a team of certified installers with over 15 years of industry experience.

### PVC Profile Systems

We offer PVC windows and doors from the leading brands on the European market:

**REHAU** — the German market leader in profile systems. We work with the REHAU Euro Design 60 (3-chamber, suitable for standard applications), REHAU Euro Design 70 (5-chamber, excellent thermal insulation with Uf = 1.3 W/m²K), REHAU Delight (6-chamber, slim sightlines for maximum light transmission), and REHAU GENEO (6-chamber, steel-free fibreglass-reinforced profile achieving Uf = 1.0 W/m²K). All REHAU profiles are 100% recyclable and meet the strictest environmental standards.

**VEKA** — another German brand with a heritage dating back to 1969. The VEKA SOFTLINE 82 offers a 7-chamber construction with an 82 mm installation depth and a thermal transmittance of Uf = 1.0 W/m²K. The VEKA EFFECTLINE series provides an economical 5-chamber alternative without compromising core quality.

**SALAMANDER** — German profiles renowned for exceptional surface durability. The bluEvolution 92 series with its 92 mm installation depth achieves Uf = 0.95 W/m²K — among the best values available. Ideal for passive and low-energy buildings.

We also offer Bulgarian-made **VIVAPLAST** and **KMG** profiles for clients seeking the optimal price-to-quality ratio without sacrificing essential technical performance.

All PVC profiles are steel-reinforced for additional structural stability and longevity.

### Aluminum Systems

Aluminum frames are the preferred choice for commercial premises, shopfronts, winter gardens, and large glazed areas. Key advantages include:

• **Exceptional strength** — aluminum profiles allow larger sash sizes with slimmer frames, maximising glazing area and natural light. - **Corrosion resistance** — powder-coated finish applied at 220°C ensures decades of colour stability and surface protection. - **Temperature tolerance** — performs without deformation from -80°C to +80°C. - **Fire resistance** — aluminum is non-combustible, making it mandatory for public buildings and fire-rated partitions.

We work with **ALUMIL**, **SCHÜCO**, **REYNAERS**, and **ETEM** aluminum systems, including thermally broken models for enhanced insulation performance.

### Glazing Units

The glazing unit determines up to 70% of a window's thermal performance. We offer:

• **Double glazing (single chamber)** — standard 4-16-4 mm configuration with spacer bar. Suitable for unheated spaces and internal partitions. - **Triple glazing (double chamber)** — 4-12-4-12-4 mm configuration. Our recommendation for living spaces — significantly improved thermal and acoustic insulation. - **Low-emissivity (Low-E) glass** — a special coating that reflects heat back into the room, reducing heat loss by nearly 50% compared to standard glass. - **Argon gas fill** — an inert gas between panes that improves thermal performance by approximately 10-15%. - **Solar control glass** — reduces summer overheating by admitting visible light while reflecting infrared radiation. - **Laminated glass (triplex)** — for enhanced security and noise reduction. If broken, the glass remains bonded to the interlayer film, preventing injury. - **Toughened glass** — up to 5 times stronger than standard glass. Required for balustrades, glass doors, and shopfronts.

### Door Types

**Entrance doors** — PVC and aluminum entrance doors with multi-point locking, panel infills or glazing, decorative elements, and a wide range of colour options. We supply models rated to burglary resistance class RC2 and RC3.

**Interior doors** — sliding, swing, and bi-fold systems in PVC and aluminum for elegant internal space division.

**Sliding systems** — HST (lift-and-slide) and PSK (tilt-and-slide) systems for terraces and balconies. The HST system accommodates sashes up to 3 metres wide and 400 kg in weight, providing unobstructed access to gardens and terraces.

**Roller shutters and folding doors** — roller and concertina systems for shops, garages, and industrial premises.

### Winter Gardens & Terrace Glazing

We design and build winter gardens with aluminum structural frameworks and energy-efficient glazing. Our terrace and balcony enclosure solutions — sliding, folding, or fixed systems — transform open spaces into year-round living areas, adding usable square footage and property value.

### Insect Screens

We complement every window and door installation with insect screens in multiple configurations: - **Roller screens** — compact and convenient, retracting into a cassette when not in use. - **Pleated screens** — aesthetically refined, suitable for large openings and sliding doors. - **Fixed screens** — the most affordable option for standard windows. - **Hinged screens** — for balcony doors and frequent-passage openings.

### Hardware & Fittings

Hardware is the heart of every window — it governs smooth operation, airtightness, and security. We work with:

• **MACO** (Austria) — precision hardware with optional anti-burglary upgrades. - **SIEGENIA** (Germany) — innovative solutions with micro-ventilation functionality. - **ROTO** (Germany) — reliable hardware with easy adjustment.

Hardware accounts for 10-20% of a window's cost but determines up to 50% of daily-use satisfaction.

### Replacing Old Wooden and Metal Frames

If your property still has old wooden frames or iron-angle ("vinkel") windows from the socialist era, upgrading to modern PVC or aluminum delivers transformative benefits: dramatically lower energy bills, elimination of draughts and condensation, vastly improved sound insulation, and enhanced security. Our team handles the complete process — careful removal of old frames, wall preparation, precise installation with foam sealing and vapour barriers, and interior/exterior finishing including plastering and sill replacement.

### Standards, Certification & Warranty

All our products are certified to European standard **EN 14351-1** (windows and external pedestrian doors) and carry **CE marking**. Energy performance is verified through independent testing of U-values (thermal transmittance), air permeability, water tightness, and wind resistance.

We provide: - Up to **10 years warranty** on profile systems (colour stability and structural integrity). - **5 years warranty** on glazing units (hermetic seal and absence of inter-pane condensation). - **5 years warranty** on hardware and installation workmanship. - Annual **maintenance and hardware adjustment** service for trouble-free long-term operation.

Every installation is documented with a detailed handover protocol, warranty certificate, and care instructions — giving you complete peace of mind for years to come.