Floor Expansion Joint Leakage Analysis Diagram

Common causes of leakage at expansion joints analysis as follows

1. Inadequate waterproof design: The waterproof design of the expansion joints is overly simplistic, failing to meet the expansion requirements. Selection of waterproof sealing materials: Originally, the waterproof sealing material was a standard type of sealant, with low resistance to aging and expansion, leading to the aging and cracking of the waterproof layer. The exposed end of the waterproofing layer is subjected to long-term high temperatures and direct sunlight, making it prone to aging and peeling off from the base, thus losing its waterproofing effect. Consequently, roof leaks are particularly prominent in most cases.
2. The waterproof design of the expansion joint is too simple, resulting in failure to meet the expansion requirements. Rainwater, under the force of wind pressure, washes over the damaged edges of the waterproofing layer, seeps into the waterproofing layer, and leaks out into the lower space.
3. Water penetrates the waterproofing layer over time due to seepage through cracks or joints in the thermal insulation layer, filling it with water. It infiltrates from gaps around overlaps in the waterproofing layer and weak spots at pipe roots or joints, as well as from unsealed or cracked seals. Additionally, defects in the layered subcontracting process can lead to damage to the waterproofing layer during the installation of the thermal insulation, allowing water to seep in through cracks and breaches, forming long-term water accumulation within the waterproofing layer. This results in minor leaks during rainy days and major leaks when the weather clears.

Expansion joint waterproof reinforcement construction drawing

Expansion Joint Waterproof Reinforcement Plan Features

Expansion joint waterproof reinforcement construction plan uses waterproof materials that match the structural layer defects of the expansion joint and the construction environment. For cracks and voids at the corner of the expansion joint vertical wall and the floor base, use leak stopper for rigid reinforcement treatment. Form a curved angle for the rigid leak-proof layer, and apply a non-curing rubber waterproof layer to the floor and vertical wall base. The chemical reaction, combined with physical adsorption, forms a rigid-flexible waterproof bonding that is firmly attached, eliminating stress caused by changes in the base layer of the expansion joint vertical wall. This ensures that the creep-type non-curing rubber waterproof layer has sufficient tensile strength to effectively resist the destruction of external stresses.