为什么都说9楼不能买？房产专家揭秘3大原因，别再被忽悠

Core Viewpoint - The article challenges the superstition surrounding the 9th floor in residential buildings, highlighting that the lower prices and longer transaction times associated with these units are influenced by both market myths and actual issues related to elevators, noise, and water supply [1][9]. Group 1: Elevator Issues - Elevator malfunctions are a significant concern for 9th-floor residents, with a national average elevator failure rate of 3.2%, which increases to 4.7% for frequently used middle floors [2]. - In a survey of 15 communities, it was found that elevator door malfunctions accounted for 38% of failures in the 9-11 floor range, which is 22% higher than other floors [2]. Group 2: Noise Concerns - Noise levels for the 7-12 floor range are higher by an average of 5.8 decibels compared to the 1-6 floor range and 7.2 decibels higher than floors above 15 [3]. - The "sandwich effect" of noise on the 9th floor results from its position, which receives both direct noise and secondary sound waves from reflections, making it particularly susceptible to noise disturbances [3]. Group 3: Water Supply Issues - The average compliance rate for water pressure in buildings below 10 floors is 92.3%, while it drops to 86.7% for buildings between 11-20 floors, indicating potential water supply issues for the 9th floor [5]. - In older communities without secondary pressure systems, 62% of 9th-floor units experience unstable water pressure, especially during peak usage times [7]. Group 4: Technological Improvements - New residential projects built after 2023 have implemented advanced elevator systems, improved soundproofing, and more reliable water supply systems, significantly reducing the disadvantages associated with the 9th floor [6]. - In newly constructed high-quality residences, the price difference between the 9th floor and other floors has decreased to below 1.7%, indicating a shift in market perception as technology improves [6]. Group 5: Rational Decision-Making - Buyers are encouraged to evaluate properties based on building age, property management quality, elevator maintenance records, and actual noise and water pressure tests rather than relying on superstitions [8]. - The impact of superstitions on purchasing decisions is diminishing, with transaction cycles for 9th-floor units in major cities narrowing to 0.9 times that of other floors, compared to a national average of 1.3 times [8].