In the external wall insulation system, a cement mortar leveling layer is to be used. In the external wall insulation system, the base layer wall structure surface needs to be leveled and laid due to the presence of unevenness or slope. The material used for leveling should be cement mortar mixed with water repellent, anti-cracking agent or water reducing agent. For mixed mortar, the strength level of the screed cement mortar should not be lower than M7.5. The screed layer is favorable for laying the insulation layer on it (the insulation layer is further divided into a bonding layer and a phenolic insulation layer). This is the leveling.
The screed is part of the external wall insulation system. The general external wall insulation system is divided into four parts: mortar leveling layer, insulation layer, crack protection layer and finish layer.
The screed construction in the external wall insulation system shall comply with the following provisions
1. When the thickness of the leveling layer exceeds 35mm, a steel mesh or fiber mesh cloth should be added in the leveling layer and placed in the middle of the leveling layer.
2. When the screed layer is mixed with anti-cracking fiber, it should be mixed with cement and sand, then add water and mix well. The surface of the screed should be smoothed or lightened according to the requirements of the waterproof material and the facing material of the waterstop belt.
Sometimes some drawings and specifications do not require the outer wall to be the first to make a mortar leveling layer, but only require the interface agent to be used before the external insulation. In fact, it should generally be leveled with mortar and then treated with an interface agent. This can not only play the role of waterproofing the external wall, but also make the thickness of the thermal insulation layer basically the same, reducing the waste of the thermal insulation material. It is recommended to convince the construction unit to do the screed first from the long-term quality effect and the reduction of the insulation material.
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