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The company Alfredo Polti SA, a typical family business, is active in the industrial sector of natural stone. It was founded by Alfredo Polti in 1950, with the launch, in Grono, of a workshop for the processing of the Gneiss Calanca. The pioneer was however Alfredo’s father, Giovanni Polti, who in 1920 was involved in the extraction and processing of the Gneiss Calanca in the quarries of Arvigo, where in 1960 Alfredo Polti transferred the entire production. The extraction of the stone from its own quarries and its elaboration in new and modern laboratories thus became two integrated phases of a single production process. The Gneiss Calanca extracted from the quarries Alfredo Polti SA is treated in modern laboratories, where expert stonemasons transform it manually or mechanically, thanks to the help of the most modern machines for working with stone. Moreover, part of the material is put on the market in the raw state, in the form of blocks, irregular or quadrangular slabs, or masonry stones. The available offer is vast and includes products for: • the substructure • the superstructure • the construction and furnishing of parks, gardens, squares and cemeteries • the creation of artifacts able to satisfy the most demanding dictates of modern architecture of exteriors and interiors. About 90% of production is destined for the Swiss domestic market. The remainder is exported, in particular to Germany, Italy, Austria and France. In many cities of these countries you can admire important works realized with the Gneiss Calanca by Alfredo Polti SA produced in Arvigo. After the death of the founder Alfredo Polti, the company was taken over by: Giovanni Polti, who takes care of the extraction and production processes and Vania Polti Ambrosini, who guarantees administrative management. Since 2013, Alfredo Polti SA remains the only active quarry in the Calanca valley. Most of Alfredo Polti SA's collaborators have many years of service in the company, synonymous with experience and professionalism at the service of customers. Since May 2007 the company is ISO 9001 certified.

Project Evolution SA is a company specialized in the construction of energy-efficient wooden houses and buildings. With over 20 years of experience and an operational headquarters in Grono (Canton of Graubünden) since 2020, it is organized to operate throughout Switzerland , managing every construction phase: from planning to final delivery. We work with Swiss precision and a rigorous technical approach, focusing on site organization, timeline compliance, and cost transparency. Structures and Building Systems • Wooden structures using X-LAM system with high static and energy performance • Prefabricated eco-friendly walls , with battens, double mineral wool insulation, and breathable finishes • Custom solutions for single-family homes, villas, extensions, elevations , and multi-storey buildings (up to 7 floors) Insulation and Living Comfort • Natural breathable insulation in rock wool or wood fiber • External thermal insulation systems using ecological, high-efficiency materials • Drywall partitions and suspended ceilings , perfectly smoothed and finished • Carefully executed interior finishes: smoothing, leveling, and surface preparation Interior Works and Installations • Supply and installation of high-efficiency windows and doors • Interior wall cladding and partition walls in drywall • Full coordination of technical installations (electrical, plumbing, mechanical ventilation) Sheet Metal and Roofs • Construction of ventilated and waterproof roofs • Custom-made metal sheet works : copper, aluminum, stainless steel • Gutters, flashings, chimney caps, and external finishes with maximum attention to detail Logistics and Material Transport Even the most complex construction sites are no challenge for us: we transport materials using any necessary method, including crane trucks, tractors, helicopters , or special solutions for isolated or hard-to-reach areas. Efficient organization is one of our core values. Why Choose Project Evolution SA • ✅ Over 2,000 projects completed in Switzerland and Italy • ✅ Advanced shell approach , with a single technical point of contact • ✅ Accuracy in installation, hidden details, and site management • ✅ On-time and on-budget delivery, no surprises • ✅ Expertise in eco-construction and certified natural materials • ✅ Solid experience with prefabricated and sustainable buildings Building with wood in Switzerland? Trust Project Evolution SA We create your eco-friendly wooden house, your sustainable building, or your custom project with maximum technical competence and attention to detail. From design to installation – we are by your side at every step. 📍 Active throughout Switzerland – Contact us for a quote or a personalized consultation.

ABOUT US With over 40 years of experience, Idrosun SA is today a well-established player in the wellness and building technology sector. Its story began in 1981 with a family vision: to offer tailored solutions that strike a balance between technical innovation and human care. Idrosun SA was born from the intuition of Willi Maag, who founded the company with the goal of uniting craftsmanship, technical expertise, and design quality. Over the years, the company has expanded its fields of operation, integrated advanced technologies, and established itself as a trusted partner for private clients, engineers, architects, designers, and businesses. Today, the company is led by Simon Maag, who took over from his father and now fully owns the company, continuing its development with a forward-looking approach. We are mainly active in Ticino , Engadin , the Zurich/Zug region , and Northern Italy , managing bespoke projects in residential, hospitality, and commercial settings. Thanks to our multilingual team, we communicate daily with clients and partners in Italian, German, English, and French , ensuring smooth and professional collaboration across multiple markets. From the very beginning, our way of working has stood out for its complete and structured method: every project is followed through all its stages – from the first consultation to the execution and long-term assistance – with consistency and care. An approach that has shaped the company’s identity and continues to define how we work. A story that keeps evolving, building new spaces of well-being every day. WE FOLLOW PROJECT STEP BY STEP We are dedicated to the well-being, comfort, and energy efficiency of our clients – both private and professional – combining cutting-edge technology with refined design. We manage every project in all its phases, from initial consultation to maintenance, ensuring rapid intervention and continuous support thanks to our emergency service active 24/7, 365 days a year. TAILORED DESIGN We create exclusive, custom-made environments that combine aesthetics and functionality. CONSTRUCTION AND INSTALLATION From construction to installation, we follow every step with precision. MAINTENANCE AND REPAIR Professional service to ensure durability and optimal performance. TECHNICAL CONSULTING AND AFTER - SALES Expert support for every need, even after installation. PRODUCT AND ACCESSORY SALES A complete range of solutions for the care and management of technical systems. OUR SERVICES Each project begins with the desire to create authentic, lasting, and personalized well-being. Our solutions combine technical know-how with aesthetic sensibility to shape functional and welcoming spaces, perfectly balanced between technology and design. Our work is structured into five main areas, all developed with the same focus on quality, efficiency, and sensory experience: WELLNESS Indoor and outdoor pools, whirlpools and spa tubs, saunas, cryo saunas and Turkish baths, cold plunge systems, biopools and natural swimming ponds. WATER TREATMENT Pumping stations and pressure boosting systems, treatment of grey and clear water, softeners and reverse osmosis systems, water distribution and irrigation systems, advanced filtration systems. HEATING AND COOLING Heat pumps and low-temperature systems, radiant heating and cooling systems, solar thermal systems for hot water production. VENTILATION Controlled mechanical ventilation systems, air treatment and dehumidification solutions, heat recovery for improved energy efficiency. AUTOMATION AND CONTROL Electrical panels and regulation systems, advanced home automation and remote control, photovoltaic systems for energy production. PRODUCTS AND ACCESSORIES Chemical products for water treatment, cleaning robots and accessories for pools and wellness areas, pool covers and safety solutions.

Founded in 1958 by Wilhelm Rizzi , Rizzi Malerei GmbH is a family-run company with over 60 years of experience in painting and building finishes. The company stands for quality, precision, and innovation , offering tailor-made solutions for private individuals, businesses, and public institutions. After being managed by Gianni and Adriano Rizzi until 2022 , since 2023, the company has been led by cousins Francesco Tavasci, Fabiano Rizzi, and Riccardo Rizzi , who continue the tradition while embracing modern technologies and innovative materials . Your Trusted Painter in Engadin, Savognin & Surroundings Located in Bivio , Rizzi Malerei GmbH operates throughout the region, including Savognin, Bivio, Surses, Albula, Upper Engadin, and surrounding areas. We guarantee professional, reliable, and personalized services for all our customers. Why Choose Rizzi Malerei GmbH? ✔ Three generations of expertise in painting and building finishes ✔ Highly skilled team , continuously trained in the latest techniques ✔ Customized solutions for projects of all sizes ✔ High-quality materials and cutting-edge technologies ✔ Outstanding customer service , focused on client satisfaction ✔ Timely completion and attention to every detail ✔ Eco-friendly and sustainable solutions , minimizing environmental impact Our Services With our team's expertise, we offer a wide range of professional services , ensuring both aesthetic appeal and functional efficiency . 1. Interior & Exterior Painting We specialize in high-quality, long-lasting paintwork using premium materials and innovative techniques. • Classic & decorative wall painting • Mold & moisture protection treatments • Water-repellent & thermal-insulating coatings • Eco-friendly paints for a healthier indoor environment Our experienced painters ensure clean, precise, and on-time work for a flawless result. 2. Thermal Insulation & Facade Coating To improve energy efficiency and reduce heating costs, we offer thermal insulation for facades , ideal for both new constructions and renovations . ✔ Lower energy consumption & heating cost savings ✔ Reduced heat loss & enhanced indoor comfort ✔ Use of innovative, certified materials This eco-friendly and sustainable solution enhances the energy efficiency and value of your property . 3. Drywall & Plasterboard Installations Plasterboard offers a flexible and stylish way to modify interiors : • Partition walls to optimize space • Decorative & functional suspended ceilings • Acoustic & thermal insulation solutions • Custom-built wall niches & integrated shelving Perfect for private homes, offices, and commercial spaces , without requiring major structural interventions. 4. Sgraffito – Traditional Wall Decoration We are among the few companies in Engadin specializing in Sgraffito , a traditional decorative technique that enhances facades with unique artistic motifs. ✔ Personalized designs with geometric, floral, or heraldic motifs ✔ Authentic craftsmanship for a distinctive look ✔ Enhancement of both historical and modern buildings Our skilled artisans create custom wall decorations , adding an exclusive and artistic touch to any building. 5. Wallpaper & Wall Coverings For those looking for an alternative to painting, we offer professional wallpaper and wall covering services , ideal for: • Refreshing interiors with stylish patterns • Creating unique decorative effects with fabric, vinyl, or natural materials • Enhancing acoustic insulation & wall protection Modern wallpapers are durable, washable, and available in countless designs , allowing endless creative possibilities . 6. Sandblasting & Restoration We provide sandblasting and restoration services for historic and modern buildings , ensuring high-quality surface restoration . ✔ Gentle removal of old paint & surface impurities ✔ Traditional restoration techniques for historical buildings ✔ Protective treatments to extend surface durability Our innovative methods guarantee impeccable results , preserving the integrity and beauty of your property . Your Trusted Partner for Painting & Building Finishes Rizzi Malerei GmbH is your expert for painting, facade renovation, insulation, and creative design solutions in Engadin, Savognin, Surses, and surrounding areas .