Laastiliitokset

Laastiliitokset, commonly referred to as expansion joints or movement joints, are designed gaps incorporated into construction materials, particularly masonry, concrete, and tiling, to accommodate thermal expansion and contraction, as well as structural movement. These joints prevent the buildup of stresses that could otherwise lead to cracking or other forms of damage in the building fabric.

The fundamental principle behind laastiliitokset is to divide a large, continuous surface into smaller, more manageable sections. These sections can then expand and contract independently without exerting excessive pressure on each other. The size and spacing of these joints are determined by factors such as the type of material used, the expected temperature fluctuations, and the overall dimensions of the structure.

In masonry construction, laastiliitokset are typically filled with a flexible sealant, such as silicone or polyurethane, to prevent the ingress of water and debris while allowing for movement. For concrete structures, these joints might be formed with pre-molded strips of compressible material like asphalt-impregnated fiberboard or rubber. In tiling applications, the gaps between tiles are often filled with grout, but wider joints between large tiled areas or at transitions to other materials serve as laastiliitokset. Proper installation and maintenance of laastiliitokset are crucial for the long-term durability and performance of a building.