Old insulation wool can be dangerous if it contains asbestos, which was commonly used in insulation until the 1970s. Asbestos fibers can become airborne when disturbed, and if inhaled, can cause serious health issues such as lung cancer and mesothelioma. It is important to have old insulation checked by a professional to determine if it contains asbestos, and if so, to have it safely removed and replaced with modern insulation materials. **

Old insulation can be worse than asbestos in some cases. Asbestos is a known carcinogen and can cause serious health issues when disturbed and inhaled. However, old insulation, such as fiberglass or cellulose, can also pose health risks if it becomes degraded, releasing harmful particles into the air. Both old insulation and asbestos should be handled with caution and removed by professionals to minimize health risks. **

To apply a new waterproofing membrane on top of an old bitumen waterproofing membrane, the surface of the old membrane should be thoroughly cleaned and prepared. Any loose debris, dirt, or old adhesive should be removed to ensure proper adhesion of the new membrane. Once the surface is clean, a primer should be applied to promote adhesion between the old and new membranes. Finally, the new waterproofing membrane can be installed according to the manufacturer's instructions, ensuring that it is properly sealed and bonded to the old membrane to provide effective waterproofing. **

The amount of insulation required for a facade renovation depends on various factors such as the climate, building codes, and the existing condition of the building. In general, the insulation should be sufficient to meet the energy efficiency requirements of the building and to improve its thermal performance. It is important to consult with a professional architect or engineer to determine the specific insulation needs for a facade renovation project. **

The roofing underlayment serves as a secondary layer of protection against water infiltration and helps to prevent leaks in the roof. It also provides an additional barrier against wind-driven rain and snow. In terms of insulation, the underlayment can help to improve the overall energy efficiency of the roof by reducing heat loss and preventing drafts. Additionally, it can provide a smooth surface for the installation of the final roofing material, such as shingles or tiles. **

When renovating a roof for thermal insulation, it is recommended to consider adding insulation materials such as fiberglass, cellulose, or foam board. These materials can help reduce heat loss and improve energy efficiency. Additionally, sealing any gaps or cracks in the roof structure can prevent air leakage and further improve insulation. Lastly, installing a reflective roof coating can help reduce heat absorption and keep the interior of the building cooler. **

An expert in the renovation of old buildings is typically an architect or a building contractor with specialized experience in historical preservation and restoration. These professionals have a deep understanding of historical building materials, construction techniques, and preservation guidelines. They are skilled at balancing the preservation of historical integrity with the incorporation of modern amenities and building codes. Additionally, they often have a network of specialized craftsmen and suppliers who can help with the restoration process. **

During a renovation, an old wall can be treated by first assessing its condition to determine if it needs any repairs. This may involve patching up any cracks or holes, and addressing any water damage or mold. Once the wall is repaired, it can be cleaned and prepped for painting or wallpapering. If the wall has historical significance, special care may be taken to preserve its original features, such as exposing and restoring old brick or stone. Finally, the wall can be finished with a fresh coat of paint or a new wallpaper to give it a refreshed and updated look. **