Roof insulation

In Portugal, more than 65% of houses are poorly insulated or not insulated at all, resulting in significant energy losses and high heating costs. Proper roof insulation can lead to annual savings of hundreds of euros and considerably increase the comfort of the home. In poorly insulated houses, up to one-third of the heat can be dissipated through the roof.

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Advantages of Roof Insulation.

• Energy savings: Reduction of heating costs by minimizing heat loss.‍
• Greater comfort: Preservation of heat inside the house during winter and outside during summer, maintaining a stable indoor temperature.‍
• Prevention of moisture problems: Proper insulation helps prevent mold and moisture issues, which is crucial in Portugal's climate.‍
• Property value increase: Well-insulated houses are more attractive in the market and can appreciate in value.

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Types of Roof Insulation for Portuguese Houses

The best roof insulation method depends on the intended use of the attic. If the attic is used as living space, it's ideal to insulate the interior or exterior. If the attic is only used for storage, insulating the attic floor may be sufficient.

1. Interior Roof Insulation

Ideal for existing houses with sloped roofs. This is a simple and widely used method, especially if the roof doesn't need renovation. For flat roofs, this method is not as recommended in Portugal due to moisture problems.

2. Exterior Roof Insulation

This is the best option for new constructions or roofs that are being renovated. The insulation material is placed on the exterior, under the roof. For existing houses, this method can be more labor-intensive as it requires removing tiles and battens.

3. Attic Floor Insulation

When the attic is used only for storage, the most economical option is insulating the attic floor. It's easy to apply and prevents heat from passing into unused spaces.

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Insulation Materials for Roofs

Choosing the right insulation material depends on the type of roof and the desired level of insulation:

• Mineral wool: Widely used in Portugal due to its excellent thermal and acoustic properties. It's fire-resistant and easy to apply in both sloped roofs and attics.
• Cork: A natural insulation material, locally available. It's lightweight, breathable, and moisture-resistant, making it ideal for interior roof insulation in Portugal's climate.
• Cellulose (blown-in insulation): Made from recycled paper, it's environmentally friendly and can be blown into roof cavities. It adapts well to the shape of the space, making it suitable for existing houses with hard-to-reach areas.

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Costs and Subsidies in Portugal

The cost of roof insulation varies depending on the method, materials used, and the size of the roof. In Portugal, subsidies and financial incentives are available for energy-saving measures such as roof insulation. Exploring these options can help reduce the overall cost.

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Conclusion

Roof insulation is a fundamental investment for Portuguese houses. Choosing the correct insulation method not only saves on energy bills but also increases comfort and property value. Whether you opt for mineral wool, cork, or cellulose, each material offers unique benefits suited to the needs of Portuguese homes.