The magical construction method of the all-round home renovation king: What is a "double bed"?
People who have watched the Japanese TV show "The Almighty Home Renovator" are often curious about the scene during the renovation of an old Japanese house: the master locks rows of "metal support feet" that look like small jacks and have rubber bases on the cement floor. Thick plywood or cement boards are laid on top, and then the wooden floor is laid. This method of raising the floor to leave a 10 to 20 centimeter space between the surface floor and the original cement floor is called "Raised Floor" in Japan. In modern houses in Japan, "same-floor drainage" piping in conjunction with double beds has become a standard norm. So, can this advanced Japanese construction method be introduced to Taiwan to solve the most difficult problems of aging water, electricity and sound insulation in the old apartments in Shuangbei?
Two core advantages of double beds: revolution in water and electricity maintenance and ultimate sound insulation
The introduction of double bed raised floor construction methods can bring about two huge changes in the physical structure of Taiwan's elderly apartments:
1. Revolution in drainage piping and maintenance on the same floor: In traditional Taiwanese apartments, bathroom drain pipes (such as fecal pipes and floor drains) pass through the cement floor, go to the "top of the ceiling of the neighbor downstairs" and then connect back to the main pipe. This means that once your drain pipe leaks, you have to go to your neighbor's house downstairs to remove the ceiling to repair it, which can easily trigger a neighbor lawsuit. If you switch to the double bed construction method, the water supply pipes, drainage pipes and all electrical wires and pipelines can all run horizontally in the hollow mezzanine below the raised floor of your home. If the pipelines age and leak in the future, you can easily replace them by simply lifting some of the wooden floor panels of your home. There is no need to destroy the mud structure, and there is no need to involve the neighbors downstairs at all.
2. Perfect impact sound insulation performance (ΔLw shock absorption): Taiwan has implemented new sound insulation regulations for building floors, and new decorations must achieve a certain decibel sound insulation effect. When traditional floor tiles are stepped on, chairs are dragged, or children run and jump, the sound will be transmitted directly through the floor to the downstairs. The bottom of the support legs of the double bed is equipped with special "shock-absorbing rubber gaskets", which can block the solid vibration waves of stepping on the upper layer of the frame, greatly reducing the impact sound. As long as the cavity is sound-absorbed during construction (such as filling with sound insulation cotton), there will be no "taiko phenomenon" resonance echo that often occurs in cheap raised floors, effectively maintaining neighborhood harmony.
Realistic bottlenecks in the construction of Shuangbei old houses: high pressure and floor skew
Although the double bed construction method is perfect in terms of water, electricity and sound insulation, it will face the following two physical limitations when implemented in Shuangbei old apartments:
1. Severe compression of indoor clear height: The floor height of old apartments is usually only 2.7 to 2.8 meters. In order to accommodate the drainage slope of the water supply and drainage pipes, the floor of a double bed needs to be elevated by at least 12 to 15 centimeters. If coupled with the low ceiling, the indoor clear height will shrink to about 2.5 meters, which will cause a serious sense of oppression when bathing or living. In addition, the opening direction and height of the anti-pry door at the entrance must also be modified simultaneously, otherwise the door will get stuck on the raised floor.
2. The original floor level is seriously skewed:After decades of ground subsidence or earthquake pull, the level of the original cement floor slabs in Shuangbei old apartments is often very poor. The lower left corner and upper right corner of a room may be 5 to 8 centimeters different. When constructing a double bed, the master must use a rotating laser level to very carefully rotate and adjust the height of hundreds of supporting legs one by one to obtain a perfect level. This requires extremely high skills from carpenters and plumbers, and the construction difficulty and time are several times that of a newly completed house.
Taipei budget price for double bed frame high floor piping
In Taipei and New Taipei, residential double bed construction method, the cost is usually calculated in "ping":
* Using Japanese standard shock-absorbing supporting feet and moisture-proof high-strength cement board/plywood as the base, the price of the construction and materials is about NT$ 5,000 to NT$ 8,500 / Ping.
* The cost of continuous work with materials is about NT$ 800 to NT$ 1,500 / square meter.
* Because the pipeline is redirected to the same floor of the home, the drainage pipeline must be redesigned to have a drainage slope and be connected to the main pipe between the pipes. The overall water and electricity pipeline configuration cost is about NT$ 40,000 to NT$ 80,000.
The overall estimate is that if a 20-square-meter apartment is renovated with double beds and water supply and drainage on the same floor, compared with traditional direct cement tile laying, the renovation budget will need to increase by about NT$ 150,000 to NT$ 250,000.
Commercial acquisitions and businessmen’s long-term asset thinking: the valuation advantage of same-floor piping
For investors who hold rent-collecting properties or renovate entire commercial apartments in the long term, the double bed frame high floor and same-floor piping construction method is . The biggest fear in a sublet property is that tenants have bad usage habits that may lead to water pipe blockage or leakage. Once the bathroom leaks using traditional construction methods, the landlord must stop renting, knock off the bathroom tiles, and face compensation negotiations with the neighbors downstairs, resulting in huge indirect rent losses. The use of a double-bed drainage system on the same floor can quickly repair pipelines within 24 hours without mud work and wall knocking, minimizing the risk of off-lease periods and water leakage and adjacent damage. In real estate commercial valuation, this asset structure with "active risk prevention and low maintenance costs" is a very convincing selling point for a premium when it is transferred to the next commercial buyer.
The latest standards for catching leaks and regulatory responsibilities in Shuangbei collective housing (2025-2026 practice)
According to Article 10 of the "Apartment Building Management Regulations" of the Ministry of the Interior and the trend of civil water leakage judgments in Shuangbei District Court in recent years, most water leakage disputes in old collective housing focus on the identification and definition of "exclusive parts" and "common parts". The roof platform and the public pipes are jointly owned by all separate owners, and the repair costs should be shared by public funds or all residents in proportion to their shares according to law; if the water supply and drainage pipes inside the floor slabs on the upper and lower floors are damaged, the pipes will be borne exclusively by the users or shared by the upper and lower floors.
At the engineering and technical level, modern professional leak detection has fully introduced non-destructive scientific testing, including "FLIR high-resolution infrared thermal imaging camera" (locating temperature difference leakage paths), "high frequency moisture meter" (measuring the moisture content of deep structures) and "pipeline air pressure and water pressure pressure test" (determining whether hot and cold water pipes are leaking). During construction, do not directly apply elastic cement or oil-based paint on the wet cement layer to seal it. Otherwise, the thermal expansion of internal water vapor will quickly cause the coating to blister and peel off, resulting in more serious powdery wall cancer. The standard construction method must first completely eliminate the water source, wait until the moisture content of the cement structure drops below 8%, and then apply the negative pressure resistant silicic acid permeability crystallized waterproof layer.
Recommendations on independent certificate storage and compensation process for water leakage repair
- Take photos and videos as evidence immediately: Use rulers to record the leakage range, frequency of water discharge, direction of water mark diffusion, and keep time stamps.
- Written notification and coordination survey: Officially notify the neighbors through the management committee or a certified letter, and agree on a professional third-party leak detection and appraisal unit recognized by both parties to conduct an on-site survey.
- The contract states the warranty terms: When signing the contract for the project, be sure to clearly specify the waterproofing warranty period (usually 1 year for partial repairs, and 2 to 5 years for the whole room or roof re-construction), and specify the water test acceptance criteria (such as a 48-hour water storage test in the bathroom shower area) to protect your own asset rights.
