Reason: poor flatness of base course Countermeasures: increase the cleaning and leveling strength of the base surface to ensure that the error caused by the leveling of the base surface is less than 4mm, and the surface is flat and free of foreign matters 1.
For waterproof construction, management personnel shall be assigned to strengthen supervision and effectively control the lap length.
Internal and external corners shall be plastered into arc corners with cement mortar.
After the internal and external arc corners are made, they are laid as a reinforcing layer, with the width of 250mm on both sides and the internal and external corners as the center…
In view of the three common defects in the quality of SBS waterproof coiled material roof, namely, short joint overlapping length, poor flatness of base course and insufficient treatment of internal and external corners, these three measures can effectively reduce the phenomenon of weak adhesion between coiled material and base course and hollow overlapping, and improve the one-time qualified rate of SBS waterproof coiled material adhesion.
2.
Before laying, the sundries on the surface of the base course shall be cleaned, and the sand, gravel and residual mortar shall be cleaned.
3、 Cause: internal and external corners are not subject to special data processing Countermeasures: the internal and external corners can be pasted with the reinforcing layer to ensure that all the reinforcing layers of the internal and external corners are laid 1.
When disclosing to all waterproof construction personnel, it is clearly required that the lap length shall not be less than 10cm 2.
2.
The minimum radius of internal corners shall be 50mm and that of external corners shall be 20mm.
The surface depression shall be leveled with cement mortar.
II.
In the basement waterproof system project, SBS waterproof coiled material is adopted for the flexible waterproof layer, which is prone to common quality problems such as weak bonding between the waterproof coiled material and the base, hollowing, and the lap of the coiled material does not meet the design requirements, affecting the quality of the overall structural waterproof technology project of the enterprise.
1、 Cause: the lap length of the joint is too short Countermeasures: strictly manage and control the length of lap joints to ensure the lap length of concrete joints 1.
