【注文住宅】ローコストの顛末 施主が建築中にリカバリーした家を丸裸にしてみたin埼玉

A Low-Cost House Built by the Homeowner: The Surprising Outcome? A thorough investigation into the performance of a "low-cost custom-built house" where the homeowner themselves performed the airtight sealing. At the request of a homeowner who was disappointed at not reaching their target C-value of 1.0, professionals used thermal imaging cameras, fog machines, and anemometers to expose the "invisible gaps." Was the amateur airtight sealing work meaningful? And what "blind spots" were revealed by the increased airtightness? 1. The "True Nature of the Gaps" Revealed by Thermal Imaging Cameras and Fog Machines Weaknesses in Insulation: Temperature changes were confirmed at the connections of the ceiling insulation (fiber-based) and at the corners of the sloped ceiling. Shocking Air Leak Point: A tremendous amount of air flowed in from the distribution board. The gaps in the CD conduit were identified as large "holes." Blind Spot in Partition Walls: The areas where wiring penetrates the insulation material become weak points in airtightness and insulation. 2. The "Ventilation Trap" of Highly Airtight Homes Pipe Fan Backflow Phenomenon: Experiments demonstrated that improved airtightness can cause outside air to backflow from the toilet exhaust fan when the range hood is in use. Actual CO2 Concentration: CO2 concentration can reach 3,000 ppm in a bedroom with five people. This highlights the importance of a "correct ventilation plan" in highly airtight homes. 3. Were the Homeowner's Efforts Rewarded? Surprising Measurement Results: Significant improvement was confirmed from the values ​​at completion. The homeowner's own efforts, such as crawling under the floor and blocking access openings, were numerically proven. Professional Advice: Improvement measures that can be taken after moving in, such as air conditioner drainage and the use of backflow prevention shutters, were taught. Frequently Asked Questions (FAQ) Q: Is it possible to make a low-cost home highly airtight? A: Yes, it is. As demonstrated in this case, proper airtight sealing during construction (taping and sealing of access openings) can dramatically improve performance even for manufacturers whose standard specifications are low in airtightness. Q: Does a good C-value automatically make the house more comfortable? A: No. Increased airtightness can lead to backflow due to negative pressure when using range hoods and increased CO2 concentration due to insufficient ventilation. A ventilation plan and equipment selection that match the airtightness performance are crucial. Q: Are there ways to find gaps after moving in? A: Thermal imaging cameras (thermography) and anemometers, like the one used in this case, are effective. Gaps are particularly likely to occur around electrical outlets, distribution boards, and floor junctions, making these key points for self-checking. #HighAirtightnessHighInsulation #CustomHomes #LowCostHomes #AirtightnessMeasurement #CValue #InsulationGap #HousingPerformance #VentilationSystem #HouseSupplements #BuildingAHouseWithoutRegrets