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When joints are permanently exposed to outdoor conditions, special silicone sealants are required. Typical exterior applications include façade joints, window and door connections as well as transitions between different building materials. Exterior silicone provides an elastic seal and reliably protects against moisture penetration. Thanks to its long-lasting flexibility, outdoor silicone is ideal for areas where material movement occurs.
Exterior joints are exposed to significantly higher loads than interior joints. In addition to moisture, temperature fluctuations and structural movement affect the joints. Silicone for exterior applications is specifically designed to permanently compensate for these stresses. Using an unsuitable sealant outdoors can lead to cracks, leaks or moisture damage to the building structure.
Silicone is used in many areas outside the building. These include exterior façade joints, silicone for window connections as well as joints at exterior doors or balconies. Outdoor silicone is also used to seal transitions between masonry, concrete, metal or other building materials, ensuring a durable and watertight joint.
Façade silicone is used to seal exterior joints between façade elements or at transitions to the building structure. These joints must remain permanently elastic in order to absorb movement. A suitable façade silicone protects the building envelope against moisture ingress and contributes to the long-term preservation of the building.
Window silicone is used to reliably seal window connections in exterior areas. It must compensate for movement between the window frame and the masonry. Exterior silicone provides a flexible seal and prevents moisture from penetrating the building fabric.
Sealing natural stone and marble in exterior areas requires special attention. Natural stone is a sensitive material that can react to unsuitable sealants with discolouration or so-called edge zone contamination. These visual defects are often irreversible. In exterior areas, joints are additionally exposed to moisture, temperature fluctuations and weather conditions. Therefore, it is essential to use a silicone sealant that is suitable for both exterior use and natural stone. Both our exterior caulk and the low-odour low-odour silicone S80 are an excellent choice for these applications.
Many acetoxy-curing silicones are not suitable for natural stone or marble. The release of acetic acid or certain ingredients can cause discolouration at the joint edges, especially on light-coloured or porous stones. In exterior areas, moisture can further intensify these effects, making careful product selection essential.
For natural stone and marble in exterior areas, a neutral-curing silicone should always be used. It cures without releasing acetic acid and is particularly material-friendly. Neutral-curing silicone is suitable for joints on natural stone façades, stone window sills, exterior steps, terrace connections and other high-quality natural stone surfaces in outdoor areas.
Careful application is essential for a long-lasting exterior joint. The surface should be clean, dry and free from old sealant residues. After application with a cartridge gun, the silicone should be smoothed evenly to create a closed surface. Full curing depends on joint thickness and ambient conditions.
You can find additional sealants in the category silicone caulk.
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