I have a semi-basement in my house, and I want to make better use of it. However, the problem is that it gets really hot during the summer. I'm currently renovating, so I'd like to ask experts for advice on how to properly handle this semi-basement.
—— Reader Mr. Cao
Waterproofing is the top priority
According to Yuan Zhiren, a senior engineer at Yuanzhou Decoration Group, the structural nature of underground or semi-underground spaces often leads to moisture seepage through walls and ceilings due to the high humidity in the surrounding soil. This can cause dampness, mold, and other issues. Therefore, no matter what you plan to do with the space, the first step should be to apply internal waterproofing to the floor and walls, especially if the property was delivered by the original developer without proper waterproofing.
When choosing materials, it's best to go with permeable crystalline waterproofing products, which are ideal for sealing underground areas. Special attention must be given to corners, joints between walls and floors, as it's not possible to conduct a water test after installation. Workers need to be extra careful during application. For those who require higher waterproofing standards, adding a layer of flexible waterproof material can further enhance protection. For instance, applying a 5 cm high flexible coating along the wall near the floor and around any risers can help prevent leaks caused by floor drains or pipes. Combining this with a waterproof membrane will significantly improve the overall performance.
For ceiling finishes, it’s recommended to use a galvanized steel keel system or anti-corrosive paint, as well as waterproof gypsum boards. As for flooring, installing treated wood over a wooden frame after waterproofing can provide both moisture resistance and aesthetic appeal.
Lighting and ventilation planning
Many basements lack windows or have very small ones, making natural light and air circulation difficult. To ensure comfort and usability, artificial lighting and ventilation systems must be considered.
Mr. Zhiren suggests that homeowners should carefully plan their lighting and ventilation strategies. For example, if you're using the space for daily activities, an air conditioner with dehumidification function would be a good choice. If you're planning a gym, place your equipment near the window to avoid discomfort from poor air quality. Even during the day, supplemental lighting is usually necessary in these spaces. For those with a larger budget, solar reflectors or prism-based systems can bring in more natural light.
â– Tips
Three factors that affect space utilization
Experts also recommend paying close attention to the original structure, ventilation, and window design when considering a home with a basement or semi-basement.
First, check the original structure. If there are load-bearing walls or columns, they cannot be removed, as this could compromise the building’s safety. So, the simpler the layout, the better.
Second, evaluate the existing ventilation system. A semi-basement with windows may not offer the same level of airflow as above-ground rooms, but it still provides some natural light and ventilation, which is beneficial for future improvements.
Third, inspect the window enclosure. There is usually a fence outside the semi-basement window, and a cover above it. It's important to ensure that these features are designed to allow proper ventilation, prevent dust, and maintain safety. If not, consider upgrading them during renovation, such as adding mesh covers to keep out debris.
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