Pohjareiistä

Pohjareiistä refers to a Finnish term that translates literally to "bottom holes" or "base holes." In its most common and practical usage, it describes a specific type of ventilation opening found in traditional Finnish wooden houses, particularly in older structures. These openings are typically located near the foundation or the base of the exterior walls of a building's crawl space or cellar.

The primary purpose of pohjareiistä is to facilitate air circulation and ventilation within the underfloor space. This ventilation is crucial for several reasons. It helps to prevent the buildup of moisture and humidity in the crawl space, which can lead to rot, mold, and damage to the wooden structures of the house. By allowing for a constant exchange of air, the pohjareiistä help to keep the building's foundation and lower structural elements dry and well-maintained.

Historically, these holes were often simple openings in the wooden planks or stonework of the foundation. In more modern constructions or renovations, they may be fitted with grates or screens to prevent pests from entering while still allowing for airflow. The size and number of pohjareiistä can vary depending on the size and design of the building, as well as the climate. Their presence is a testament to traditional building practices focused on durability and addressing environmental factors.