What are the construction requirements for plastering cement mortar screed layer for roofing project

1. The thickness of the cement mortar screed is selected according to different base types. The drainage slope shall be constructed according to the design regulations, and if the design is not specified, the construction shall be carried out according to the following requirements. Drainage slope of the roof:

The slope of the structure should be 3%, and the slope of the material should be 2%. The longitudinal slope of gutters and gutters is not less than 1%. The water drop at the bottom of the gutter and ditch shall not exceed 200mm.

2. The roof should be sloped by the load-bearing structure. Roofs with insulation layers can be found with lightweight materials or insulation layers; If the load-bearing structure is horizontal and there is no insulation layer, it is advisable to use lightweight commercial concrete or lightweight materials to find the slope.

3. Before construction, the mortar screed layer should check the quality of the roof base, the installation of the roof panel, the filling joint, the drainage slope, the elevation and installation of the gutter and the water drop. The structures, pipes and embedded parts protruding from the roof have been constructed and installed before the screed can be constructed. The leveling layer should be left with a grid joint, the width of the joint should be 20mm, and the grid joint can be appropriately widened when it doubles as the exhaust duct of the exhaust roof, and should be communicated with the insulation layer.

Construction procedures: 1. Clean and shovel the ash lumps on the base plate surface; Rinse and sweep clean.

2. Pull the slope drainage line, make a standard slump cake, and set up a grid according to the regulations (the wooden strips of the separator must be wet, and plastic strips can also be used).

3. Brush 107 glue at 1:4:10 on the board surface: water: cement slurry of cement once. In strict accordance with the provisions of the mix ratio of the measurement of the mixing mortar, the mortar should be mixed with the use, and the mixed mortar must be used up within 3 hours.

Construction sequence: 1. There are high and low floors to be powdered first and then the high and low floors, and the first powder is far away and then the powder is close in the same plane.

2. The mortar in a sub-warehouse should be paved at one time, and it is not allowed to leave construction joints, scrape and pat it with a long bracket, and compact and smooth it after collecting water. Divided into two plastering, the surface is free of uneven grooves, pits, hemp surface and peeling, and the periphery of the lattice seam should be kept flat. After 12 hours of full wet curing, maintenance is generally not less than 7 days, in winter to do a good job of keeping warm and anti-freezing, it is best to spray curing liquid at the end of the setting.

3. The connection between the base and the protruding roof structure (parapet, vertical wall, skylight wall, deformation joint, chimney, etc.), as well as the corner of the base layer (water drop, cornice, gutter, gutter, ridge, etc.), should be made into an arc. A slightly lower pit should be made around the water drop of the inner drainage of the circle.

The quality standard of cement mortar screed: the drainage slope is accurate, and the surface flatness of the screed layer shall not exceed 5mm, and it shall be checked with a 2m ruler. Only gentle changes are allowed in the voids, and no more than one is allowed per m of length. The surface shall not have any defects such as crispiness, sanding, shell cracking, etc.

For details, please refer to the GB50207-2012 Code for Quality Acceptance of Roofing Engineering

B. If you work on the prefabricated insulation layer of the plate, you should first level the bottom of the board, and the vertical seams and corners that are not easy to fill should be filled with the debris of the same kind of insulation plate.

c. Sprinkle and moisten: Before wiping the leveling layer, the base wine should be moistened, but it should not be watered through, and it should be properly mastered to achieve the degree that the leveling layer and the insulation layer can be firmly combined.

d. The base layer that is not easy to combine with the leveling material should be treated at the interface.

E. Punching and pasting ash cake: according to the slope requirements, pull the line to find the slope and paste the ash cake, and punch the ribs in the direction of drainage, and the spacing of the punching bars is.

Find the flooding at the drainage ditch and rainwater inlet, and carry out the screed plastering after flushing.

f. The screed layer should be left with a lattice seam, and the width of the general lattice seam should be 20mm; The position of the lattice joint should be left at the end of the plate, and the maximum spacing between the longitudinal and horizontal joints: cement mortar or fine stone concrete screed should not be greater than 6m; The asphalt mortar screed should not be greater than 4m

The separator should be filled with sealing material.

g. The drainage slope of the screed layer should meet the design requirements. The slope of the flat roof should be 2%; The longitudinal slope of the gutter and eaves should not be less than 1%, and the water drop at the bottom of the ditch should not exceed 200mm.

h, the junction of the insulation layer (base) and the protruding roof structure (parapet, gable deformation joint, air hole, etc.) and the corner of the base layer, the leveling layer should be made into an arc type, and the radius of the arc should meet the requirements of the following table. Around the water drop for internal drainage, the screed should be made into a slightly lower pit.

i. Gutters, corners, roots, etc. should be done before plastering a large area, and the parts with slope requirements must meet the drainage requirements.

Large-area plastering is spread with mortar in the middle of the two ribs, flattened with a trowel, and then scraped with a scraper according to the elevation of the ribs on both sides, and then leveled with a wooden trowel, and then checked the flatness with a wooden bar.

J, iron trowel press the second and third times: when the cement mortar begins to condense, people step on it and have footprints but do not sag, use the iron trowel to press the second time, pay attention to prevent leakage, and the dead pit, dead corner, sand hole smoothing, when the trowel can not press the wipe, you can level, compact, complete the third time of plastering, this process, should be carried out before the final setting of the mortar. The consistency of the mortar should be controlled at about 70mm.

k. Maintenance: After the leveling layer is smoothed and compacted, it is watered and cured after 24 hours at room temperature, and the curing time is generally not less than 7d, and the waterproof layer can be constructed after drying.

<>a. Grassroots cleaning: clean the loose debris on the structural layer and insulation layer, and the hard blocks protruding from the surface of the base layer should be smoothed and cleaned.

B. If you work on the prefabricated insulation layer of the plate, you should first level the bottom of the board, and the vertical seams and corners that are not easy to fill should be filled with the debris of the same kind of insulation plate.

c. Sprinkle and moisten: Before wiping the leveling layer, the base wine should be moistened, but it should not be watered thoroughly with the water of the town, and it should be properly mastered to achieve the degree that the leveling layer and the insulation layer can be firmly combined.

d. The base layer that is not easy to combine with the leveling material should be treated at the interface.

E. Punching and pasting ash cake: according to the slope requirements, pull the line to find the slope and paste the ash cake, and punch the ribs in the direction of drainage, and the spacing of the punching bars is. Find the flooding at the drainage ditch and rainwater inlet, and carry out the screed plastering after flushing.

f. The screed layer should be left with a lattice seam, and the width of the general lattice seam should be 20mm; The position of the lattice joint should be left at the end of the plate, and the maximum spacing between the longitudinal and horizontal joints: cement mortar or fine stone concrete screed should not be greater than 6m;

The asphalt mortar screed should not be larger than 4m, and the sealing material should be embedded in the separation joint.

g. The drainage slope of the screed layer should meet the design requirements. The slope of the flat roof should be 2%; The longitudinal slope of the gutter and the eaves travel ditch should not be less than 1%, and the water drop at the bottom of the ditch should not exceed 200mm.

h, the junction of the insulation layer (base) and the protruding roof structure (parapet, gable deformation joint, air hole, etc.) and the corner of the base layer, the leveling layer should be made into an arc type, and the radius of the arc should meet the requirements of the following table. Around the water drop for internal drainage, the screed should be made into a slightly lower pit.

i. Gutters, corners, roots, etc. should be done before plastering a large area, and the parts with slope requirements must meet the drainage requirements.

Large-area plastering is spread with mortar in the middle of the two ribs, flattened with a trowel, and then scraped with a scraper according to the elevation of the ribs on both sides, and then leveled with a wooden trowel, and then checked the flatness with a wooden bar.

J, iron trowel press the second and third times: when the cement mortar begins to condense, people step on it and have footprints but do not sag, use the iron trowel to press the second time, pay attention to prevent leakage, and the dead pit, dead corner, sand hole smoothing, when the trowel can not press the wipe, you can level, compact, complete the third time of plastering, this process, should be carried out before the final setting of the mortar. The consistency of the mortar should be controlled at about 70mm.

k. Maintenance: After the leveling layer is smoothed and compacted, it is watered and cured after 24 hours at room temperature, and the curing time is generally not less than 7d, and the waterproof layer can be constructed after drying.

X0D X0A program: leveling, cleaning the base layer, making ash cakes, making separation joints, wetting the ground but not accumulating water, sweeping slurry, slurry, scraping, calendering, curing.

1. The engineering quantity of the leveling layer is calculated according to the area of "m 2".

2. The area of the floor and the ground is calculated according to the net space area between the main walls.

3. The area occupied by the structures, equipment foundations, indoor pipelines, trenches, etc. protruding from the ground should be deducted (the part that does not need to be leveled, such as the area occupied by the trench cover, etc., should also be deducted).

4. The area occupied by columns, buttresses, partition walls, chimneys attached to walls and inner holes is not deducted.

5. However, the openings of door openings, empty rings, heating slots, and niches are not increased.

6. In order to facilitate construction, the mortar used in the construction process is generally mixed on site, and the cement mortar mix ratio of 1:3 refers to the weight ratio, and then converted into a volume ratio according to the capacity of the on-site mixer or material container; The mortar used in structural construction is mostly finished mortar, and the strength of the mortar is mostly expressed by the strength of the mortar, such as M5, mortar, etc.

7. Extended information: the basic process of cement mortar plastering.

8. Find the rules, the four corners of the wall are squared Horizontal line leveling, vertical line hanging straight Make standard ash cake and punch bar Yin and yang corner square Interior wall plastering The bottom layer is lower than the punch bar The middle layer is flat and punched The surface layer decoration ratio is strictly speaking, and the sand particle size, moisture content, the actual strength of cement and the construction level have a lot to do with the sand particle size, moisture content, cement actual strength and construction level.

9. Assuming that the deficit is absorbed: cement grade (actual strength, medium sand is used, and the moisture content of the sand is.

10. Construction level: Generally, the mix ratio of cement mortar per cubic meter of preparation strength is (weight ratio): cement:

Sand = 1 Material Consumption: Cement: 267kg Medium Sand:

1472kg As for the water, it is roughly around 40kg, which should be adjusted according to the actual situation on site.

What should be the corresponding quota for the roof cement mortar screed? It should be implemented according to the cement mortar leveling layer and the quota subheading.

What are the methods of roof screed construction? What are the steps? Please see the article of Zhongda Consulting.

1. Before operation, sprinkle water on the base layer to moisten, sweep the pure cement slurry once, and spread the mortar with the brush to make it firmly bonded with the base layer, without loosening, hollowing, pits, sanding, ash and other phenomena.

2. The surface of the leveling layer is smooth and smooth, and its flatness is checked with a 2m long ruler, and the maximum void of the pin is not more than 5mm, and the void is only allowed to change gently, and the pit should be cement: sand: 107 glue = 1:: mortar is smooth.

3. The base and the knot rolling hollow structure of the protruding roof, such as the parapet wall, the piercing pipe, and the yin corner connected to it, should be wiped into a uniform and smooth small fillet, and the corner connected by the base layer and the cornice, gutter, water drop, and roof brother Beiyou ridge should be wiped into a smooth small arc, and its radius should be controlled between 100 and 150mm, and the distance between the center of the parapet wall and the water drop should be more than 200mm.

4. After the cement mortar screed layer is compacted and smoothed and solidified, it should be sprinkled with water for curing in time, and the curing time shall not be less than 7 days.

5. After the construction of the leveling layer, in order to avoid shrinkage cracks, set up separation joints every 4 6m, caulk with small wooden strips, gently take out the caulking strips before final setting, or use a cutting machine to cut, the seam width is 2cm, and the sealing material is embedded in time.

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The construction method of the façade mortar screed layer is as follows:1Cleaning:

Before construction, clean the walls to remove debris and sand. 2.Dealing with walls:

Before preparing the screed, it is necessary to check the flatness and strength of the wall, and if the wall is cracked, hollow and loose, it needs to be repaired and reinforced. 3.Erection of vertical lines:

Depending on the length and width of the wall, vertical lines are erected at the four corners of the wall or at representative locations to guide the height of the screed. 4.Apply the screed:

Apply mortar to the wall and level it with a spatula to level the wall surface with the vertical line. 5.Trimming:

After the screed is dry, trim and carry out secondary leveling as needed until the wall is completely flat. 6.Final decoration:

Finally, the leveling layer is polished, optimized and trimmed, and the subsequent decoration construction of the trouser belt shed is carried out. The construction method of façade mortar screed needs to pay attention to the following aspects: 1

Mortar selection: Select appropriate mortar according to the requirements of the project and the wall surface. Under normal circumstances, Portland cement mortar should be selected, with strong cohesion, good self-fluidity, and suitable for construction.

2.Mortar mix ratio: In order to ensure that the proportion of cement, sand, water, etc. at the head of the line is appropriate, the proportion of mortar can be adjusted slightly according to the actual situation of the construction wall to reduce deviations.

3.Technical standards: According to the construction standards, each link is operated.

Seek professionals to operate it in order to achieve safety and stability. Therefore, there are many steps and matters to be paid attention to in the construction method of façade mortar screed, which need to be selected according to the specific situation. It is best to find a professional construction personnel to operate, and you need to pay attention to safety and effect in every link.