Solar window film installation Spain-Out of the sun in Spain

Solar window films come in several types, including reflective (like silver or titanium films), dyed, and spectrally selective films. They reduce heat, glare, and UV radiation by reflecting or absorbing solar energy, improving comfort and energy efficiency indoors.

When dealing with reinforced or tempered glass, especially on sliding doors, it is crucial to install solar films on the outside of the window. This is because reinforced glass tends to have a toughened surface that reacts differently to heat buildup. Installing the film incorrectly on the inside can cause what is called a thermal breach: the film blocks and traps heat unevenly, causing stress that may lead to glass cracking or shattering.

External installation allows the film to reflect heat before it penetrates the glass, minimizing thermal stress on toughened glass. Thus, for reinforced or tempered sliding doors, external film installation is essential to ensure safety, maximize heat rejection, and prolong the film’s lifespan.

In summary:

• Reflective and metallic solar films are very effective for blocking heat and UV.
• Reinforced glass must have film installed externally to avoid thermal stress damage.
• Wrong installation risks glass breakage due to uneven heat buildup, known as thermal breach.

This approach provides maximum energy efficiency, privacy, UV protection, and long-term durability—especially critical in Spain’s sunny climate and for sliding doors with toughened glass surfaces.