In Jinan, many homeowners encounter this problem when decorating: just after painting the walls of their new houses and bathrooms, with a gentle swipe of their hand, sand will fall down, and with a drumming hammer, there may even be large areas of floating sand falling off. According to local decoration quality inspection data in Jinan, the occurrence rate of sanding in such plastering mortar is as high as 42% in new residential buildings and old house renovations. In damp areas such as kitchens and bathrooms, due to insufficient base strength, the risk of ceramic tiles falling off after subsequent tiling has risen to 68%, bringing great safety hazards and rework costs to homeowners.
Many homeowners in Jinan, when faced with sanding on their walls, their first reaction is to purchase sand fixing agents and spray them online, trying to solve the problem through simple operations. However, many people overlook the core pain point: the root cause of sanding on the plastering mortar is the defects in the base layer itself, rather than the surface floating sand problem. Based on on-site construction experience and the requirements of the "Technical Regulations for Building Plastering and Mortar", the sanding and sanding of household walls in Jinan are mainly caused by two core reasons: firstly, the imbalance of mortar mix proportion, insufficient cement dosage during construction, excessive mud content in sand particles (exceeding 3%), or uncontrolled water cement ratio, resulting in insufficient bonding strength of mortar and the formation of a "loose" base layer; The second issue is inadequate maintenance, where the mortar is not moisturized and cured within the specified time after application, especially in Jinan's hot and dry summer climate and cold and cold winter climate. This can easily lead to insufficient hydration of cement, failure to meet mortar strength standards, and the occurrence of lack of adhesion and easy scraping off.
The problem of sanding on walls in different areas needs to be treated differently, and blindly using sand fixing agents may pose greater hidden dangers. For the walls of dry areas such as living rooms, dining rooms, bedrooms, etc. in Jinan, if the sanding degree is light, high-quality sand fixing agents can be sprayed for treatment. After construction, strength testing should be carried out, and nails should be used to scratch without falling off or floating sand. After proving that the base strength meets the standard, putty and coating processes can be carried out, which can basically meet daily use needs and do not require large-scale rework. However, it should be noted that sand fixing agents can only solve the problem of surface looseness and cannot fundamentally compensate for the shortcomings of insufficient mortar mix ratio and curing. They are only suitable for dry, non load bearing wall areas.
In damp areas such as kitchens and bathrooms that require tiling, once sanding occurs, it is strictly prohibited to use only sand fixing agents for direct tiling. According to the statistics of rework cases in the decoration industry in Jinan, if the base strength of such areas is insufficient, even if high-strength bonding mortar or tile adhesive is used, there is still a probability of over 60% of tile hollowing and falling off in the later stage. In severe cases, the bonding mortar layer will directly bring down the loose mortar of the base, which not only affects the appearance, but also may injure personnel. According to the regulatory requirements, such areas need to completely remove the sandy base layer, re mix the plastering mortar according to the standard ratio, carry out layered construction and do a good job of moisturizing and curing, ensure that the compressive strength of the base layer meets the standard, and then carry out tiling operations to eliminate the risk of detachment from the root.
We would like to remind all homeowners in Jinan that the construction quality of plastering mortar directly determines the service life and living safety of the wall. Do not neglect the mortar mix ratio and maintenance process in order to save costs and shorten the construction period. Choose a professional construction team, strictly follow the "Quality Acceptance Standards for Building Decoration and Renovation Projects", do a good job in grassroots treatment and post maintenance, in order to avoid problems such as sanding and tile detachment. If there is a problem of sanding on the wall, it is recommended to contact professional personnel in a timely manner to test the strength of the base layer and take targeted measures to avoid small problems from becoming major hidden dangers, which not only wastes time and cost but also affects the living experience.
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