[Prevention of hollow tile arch expansion] Earthquake temperature difference attack! The cause of the bursting of the "Penggong" floor tiles in Shuangbei Apartment: the shear strength of the cement and the construction method of reserved earthquake-proof expansion joints

Taipei winter temperature difference and frequent aftershocks: reasons for the explosion of marble and polished brick "Peng Gong"

In Taiwan, which has a humid climate, residents in northern and northern Taiwan often hear a series of harsh "cracking" cracking sounds coming from the floor of their living rooms every time the winter cold snap hits. Then the entire polished quartz tile or 2-inch wall will arch or even burst into pieces. This is commonly known as "Heaving/Buckling" in Taiwan's engineering circles. The bulging floor tiles are not simply due to poor quality tiles, but the result of the double physical stress of "sudden temperature drop (temperature difference shrinkage)" and "frequent earthquake shear force". When the temperature drops sharply, the concrete floor slabs shrink over a large area, and the polished bricks, which are extremely hard and have almost no shrinkage, are severely squeezed. At this time, if the base layer of the tiles is not solid enough (the hollow rate is high) when the tiles are pasted, or there is no elastic enough joint between the tiles, the huge compressive stress will cause the tiles to arch outward at the most vulnerable stress point. When the aftershocks shake, the stress will be released instantly, causing the floor tiles to burst into pieces.

Construction standards for shear strength and backfill rate of polymer clay (tile adhesive)

To prevent the tiles from arching during alternating earthquakes and temperatures, the plaster master must abandon the traditional "pure cement mortar pasting method" during construction and switch to the polymer "Polymer-modified Tile Adhesive" that meets national standards, and follow strict backfill construction standards:
* Polymer resin powder is added to Yiguang, which makes the cured cement-based interface have excellent "flexibility (Deformability)" and shear resistance. It can absorb the slight relative displacement caused by thermal expansion and contraction between the concrete floor slab and the tiles, preventing stress from being directly transmitted to the tile body.
*Traditional construction often uses spot pasting or only primer on the wall. The standard construction method requires the use of a "Notched Trowel" to scrape out uniform strip grooves (tooth marks) on the cement wall (or floor) and the back of the tiles at the same time. The tiles are then laid flat and evenly hammered and compacted with a rubber hammer. This can ensure that the adhesive coverage rate (backfill rate) on the back of the tiles reaches more than 90%, eliminating internal hollows (no hollow air layer), so that the floor tiles will not crack due to uneven local stress.

The core functions of tile expansion joints and elastic caulking agents in earthquake prevention

In addition to adhesives, the "gap width" and "caulking material" of tile paving are key pressure relief valves to release structural pressure:
1. For polished quartz tiles or large floor tiles (such as 80x80cm or 60x120cm), fixed-width crosses (Tile Spacers) must be used during construction, and a gap of at least 1.5mm to 2.0mm must be reserved. "Seamless paving" is strictly prohibited, because seamless means zero pressure relief space, and the temperature difference will cause arching and bursting.
2. Do not use ordinary pure white cement mortar to fill the gaps between tiles, because ordinary cement is rigid after hardening and cannot absorb displacement. You should use high-grade "anti-mildew and anti-cracking caulking" with added rubber elastomers or "Silicon elastic joints" at the corners and door thresholds, so that the entire tile floor can shrink slightly towards the gaps when under pressure to resolve the arching force.

How to avoid the second re-laying of tiles due to drumming (hollowing) CapEx

For investors and property purchasers who renovate historic houses, bursting of indoor floor tiles is a costly and completely preventable "secondary reset of CapEx (capital expenditure)."
Once a floor tile bursts in a rental suite or office, not only does the entire house need to be emptied of furniture, and the property must be unrented for 3 to 5 days to be demolished and resurfaced, but the noise and dust it generates often trigger complaints from neighbors and requests from tenants to withdraw from the lease. Therefore, when inspecting and accepting clay work, the "five-point tapping method" must be used to test each tile one by one using a telescopic drum stick: tap the center and four corners of the tiles. If there is a hollow sound (the hollow rate is greater than 10%), the clay work team should be asked to immediately lift and reattach the tiles. The work team is required to use imported high-grade clay, strictly implement double-sided painting and reserve earthquake-proof expansion joints. Although the construction cost per square meter increases by about 1,000 yuan, it can ensure that the tiles will not bulge or peel off for 20 years. It is a smart move to maintain the value of commercial assets and avoid the financial risks of sudden overhauls.

Decoration and renovation contract specifications and project budget risk prevention (2025-2026 practice)

Residential interior decoration and water and electricity renovation involve huge financial and professional technical requirements, and are also one of the areas with the highest incidence of consumer disputes. According to the "Regulations on Interior Decoration of Buildings" announced by the Ministry of the Interior's Land Management Bureau and the "Interior Decoration Contract Template" of the Consumer Protection Agency of the Executive Yuan, when signing any decoration or water and electricity project contract, homeowners must adhere to the principles of "item detailing (pointing of work and materials)" and "staged acceptance payment", strictly reject vague estimates that "complete the whole room project in one go", and eliminate common disputes from the source of malicious additional payments after the start of construction.

In terms of budget preparation, industry standards recommend that the overall water and electricity project be disassembled into: foundation removal and stone removal, water supply and drainage pipes and outlet piping, electrical box and circuit configuration, switch and socket panel installation, mud backfilling and waterproofing, and general acceptance of the installation of electricity and water for all room equipment. It is recommended that the contract payment adopt a healthy payment ratio of 10% signing deposit, 30% completion of water and electricity pipeline slotting and piping, 30% completion of wood and cement structure, 20% completion of equipment installation, and retaining 10% of the final acceptance payment. The final payment will be allocated after confirming that the water and electricity functions are operating correctly.

Key points of pit prevention inspection during project construction and acceptance

1. On-site setting out to confirm positioning: Before water and electricity enter the site to cut stones and troughs, the homeowner should check the height of the switch socket, the height of the air-conditioning drain hole and the drainage slope one by one to avoid the dilemma of finding that the socket is blocked by the cabinet after the woodwork or system cabinet comes in.
2. Pipeline archiving, photography and storage: Before the water and electricity piping is completed and the pipes are sealed, it is necessary to take high-resolution photos and laser ranging marks of the ceiling, wall and ground pipeline directions of the whole house and archive them as a key basis for avoiding hidden water and electricity pipes when drilling holes in the wall to install paintings and hanging cabinets in the future.
3. Inspection of brand specifications of incoming materials: Confirm that incoming wires (such as Pacific, Walsin Lihua), circuit breakers (such as Shihlin Electric, Panasonic) and water pipes (Nanya PVC, SUS304 stainless steel) have CNS markings and factory inspection certificates to prevent inferior sub-brand materials from being mixed.