抹面砂浆按施工厚度分为两大类：普通抹灰砂浆，厚度通常在15-20mm；薄层抹灰砂浆，厚度仅3-8mm。两者相差的不只是厚度，而是完全不同的材料逻辑和适用场景。

The plastering mortar can be divided into two categories according to the construction thickness: ordinary plastering mortar, usually with a thickness of 15-20mm; thin plastering mortar, with a thickness of only 3-8mm. The difference between the two is not only the thickness, but also the completely different material logic and applicable scenarios.

普通抹灰砂浆的“厚”是有原因的。 传统水泥砂浆抹灰需要一定厚度来保证强度和稳定性。太薄了，砂浆层自身强度不够，容易空鼓；同时，厚层砂浆能“吃掉”基层的不平整度，通过多遍批刮逐步找平。普通抹灰砂浆的强度等级从M2.5到M30不等，加气混凝土墙面通常用M5或M7.5，混凝土墙面则可能需要M10以上。但厚层抹灰有一个先天短板：水泥用量大，收缩率也大。如果养护不到位，厚层砂浆表面容易出现细密裂纹。

The thickness of ordinary plastering mortar has a reason. Traditional cement mortar plastering requires a certain thickness to ensure strength and stability. Too thin, the mortar layer itself lacks strength and is prone to hollowing out; At the same time, thick mortar can "eat up" the unevenness of the base layer and gradually level it through multiple batches of scraping. The strength grade of ordinary plastering mortar ranges from M2.5 to M30, while M5 or M7.5 is usually used for aerated concrete walls, and M10 or above may be required for concrete walls. But thick plastering has an inherent weakness: the amount of cement used is large, and the shrinkage rate is also high. If the maintenance is not in place, fine cracks are prone to appear on the surface of thick mortar.

薄层抹灰砂浆用“配方”换“厚度”。 它通过添加可再分散乳胶粉等聚合物改性剂，在很薄的厚度下就能实现足够的粘结强度和柔韧性。薄层砂浆的粘结强度通常要求≥0.3MPa，同时具备良好的保水性和抗裂性。施工厚度3-8mm意味着它不能用来“填平”基层的大幅凹凸——基层建议先经过处理，薄层砂浆只做非常终的精细找平。薄层砂浆的优势在于：自重轻，对基层的荷载小；干燥快，缩短工期；收缩小，不易开裂。

Replace the "formula" with "thickness" for thin layer plastering mortar. It can achieve sufficient bonding strength and flexibility at a very thin thickness by adding polymer modifiers such as redispersible latex powder. The bonding strength of thin mortar is usually required to be ≥ 0.3MPa, while also having good water retention and crack resistance. The construction thickness of 3-8mm means that it cannot be used to "fill in" the large unevenness of the base layer - the base layer must be treated first, and the thin layer of mortar is only used for the final fine leveling. The advantage of thin mortar lies in its light weight and low load on the base layer; Fast drying, shortening the construction period; Shrinkage is small and not easy to crack.

石膏基抹灰砂浆是另一条技术路线。 抹灰石膏具有粘结力强、收缩性小、不易空鼓开裂的特点，同时具备保温隔热和调湿性能，生产能耗也低于水泥抹灰。在室内墙面和顶棚的基底抹灰找平中，石膏基砂浆的施工体验明显优于水泥砂浆——和易性好、上墙轻便、干燥快。但石膏基砂浆不适合潮湿环境，厨房、卫生间、外墙等场景仍需使用水泥基抹灰砂浆。

Gypsum based plastering mortar is another technical route. Plastering gypsum has the characteristics of strong adhesion, low shrinkage, and is not easily prone to hollowing and cracking. At the same time, it has thermal insulation and humidity control properties, and its production energy consumption is lower than that of cement plastering. In the base plastering and leveling of indoor walls and ceilings, the construction experience of gypsum based mortar is significantly better than that of cement mortar - it has good workability, is lightweight when applied to walls, and dries quickly. However, gypsum based mortar is not suitable for humid environments, and cement-based plastering mortar is still required for scenes such as kitchens, bathrooms, and exterior walls.

选型逻辑很简单：看基层和看环境。 基层平整度差、需要大量找平，用普通抹灰砂浆“打底”；基层已经比较平整、只需要薄层修整，用薄层抹灰砂浆。室内干燥区域优先考虑石膏基砂浆，潮湿区域和外墙建议用水泥基砂浆。抹面砂浆的“厚度”选择，本质是在“找平能力”和“开裂风险”之间找平衡——厚有厚的代价，薄有薄的前提。

The selection logic is simple: look at the grassroots and look at the environment. Poor flatness of the base layer requires a large amount of leveling, and ordinary plastering mortar is used as a "base layer"; The base layer is already relatively flat and only requires a thin layer of finishing, using a thin layer of plastering mortar. Gypsum based mortar is preferred for indoor dry areas, while cement-based mortar must be used for damp areas and exterior walls. The selection of "thickness" for plastering mortar is essentially a balance between "leveling ability" and "cracking risk" - the cost of thickness and the premise of thinness.

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