What is the general slope of the screed?What is the difference between slope finding layer and scree

The building slope is generally 2

The design drawing will tell you the lowest point thickness, which is generally 2cm. First find the middle watershed, such as finding the slope of 2% (1m long 2cm slope), such as the amount from the watershed to the lowest point is 4m, the highest point is 4*2+2=10cm.

Average thickness: find a representative piece on the spot, how many points are measured, deduct the lowest point and the highest point, and find the average.

i.e. height. 1. Empty drum.

The reason for the hollowing of the floor is that the surface of the floor base is not cleaned, or the floor is not moistened with water when the floor is pasted, and the glue is insufficient, which leads to the fact that the back of the floor can not be completely fitted with the surface of the floor when the floor is installed, and the phenomenon of hollowing occurs after the ground is leveled.

2. Cracks. The phenomenon that is easy to occur when the ground leveling construction is done incorrectly is cracks. There are many reasons for cracks, in addition to the hollow drum mentioned in the first point, which may cause cracks, it may also be that the cement used in construction is expired, or the cement number used is used.

Errors lead to a weakening of the cement's adhesion, resulting in cracks.

3. Anti-sand. The floor is anti-sand, which is the sandy phenomenon mentioned at the beginning of the article. If there is a phenomenon of anti-sand, it is most likely that the cement and sand are not completely mixed during construction, resulting in some sand not being bonded with the cement, resulting in anti-sand phenomenon.

Or during construction, some businesses add soil to the sand in order to increase profits, which will also lead to poor adhesion between sand and cement, and the phenomenon of anti-sand will occur.

The problems caused by the ground leveling construction are the above three points, and other phenomena such as ash and peeling are related to the above reasons, so we should pay attention to these details during the ground leveling construction to reduce the occurrence of hollowing, cracks, anti-sand and other phenomena.

The main differences are, different construction, different meanings, and different construction requirements, as follows:

First, the construction is different.

1. Find the slope layer.

According to the designed drainage direction, a certain gentle slope is built.

2. Screeding.

The original structural surface is leveled and laid with the base layer due to the unevenness or slope.

Second, the meaning is different.

1. Find the slope layer.

Drain roof rainwater into the stormwater drainage system of buildings and cities.

2. Screeding.

It is beneficial to lay a surface layer or a waterproof and thermal insulation layer on it.

Third, the construction requirements are different.

1. Find the slope layer.

The concrete structure roof should be used to find the slope of the structure, and the slope should not be less than 3% (the specific specifications are slightly different in different places).

When using building slope finding, it is advisable to use lightweight materials with light weight, low water absorption and certain strength as light aggregates, and its strength should not be lower than that of 2%.

2. Screeding.

The leveling layer should be set up with lattice joints, and the spacing of the joints should not be greater than 6m. The allowable deviation of the surface flatness of the screed is 5mm.

There are two calculation methods for roof slope finding layer:

1. Calculation method for controlling the thickness of the thinnest part of the slope opening layer

Formula: slope finding layer engineering quantity (v) = roof area (s) * average thickness (h);

Average thickness (h) = slope width (l) * slope coefficient (i) * 1 2 + thickness at the thinnest point.

Second, the calculation method of the slope layer of the roof slope layer that controls the thickness of the thickest part:

Formula: slope finding layer engineering quantity (v) = roof area (s) * average thickness (h);

Average thickness (h) = slope width (l) * slope coefficient (i) * 1 2 + thickness at the thinnest point + thickness at the thickest point - slope width * slope coefficient .

Standard. The drainage slope of the flat roof, the slope of the material should be 2%, the longitudinal slope of the gutter and the eaves should not be less than 1%, the water drop at the bottom of the ditch shall not exceed 200mm, and the slope should not be less than 5% within the diameter of 500mm around the water drop.

The eaves ditch slope layer is 1:3 cement mortar slope 5, and the thinnest part is 20mm thick. Use cement mortar to find the slope, because the slope should be 1% according to the specification, and the water drop at the bottom of the ditch is 200mm, so it is not only high cost, but also large load.

If the slope is found with insulation material, although the load is smaller, the cost is higher and it is not necessary.

The concrete structure roof should be used to find the slope of the structure, and the slope should not be less than 3% (the specific specifications are slightly different in different places). When using building slope finding, it is advisable to use lightweight materials with light weight, low water absorption and certain strength as light aggregates, such as light aggregate concrete, ceramsite, slag, aerated concrete blocks, etc., and its strength should not be lower than, and the slope is 2%.

For example, if the thickness of the thinning bird is 30mm, find a 2% slope, and measure the length of the ridge to the thinnest point from the orange in the drawing, if 10 meters, then the average thickness = (