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    Home > Coatings News > Paints and Coatings Market > Coating process: roof waterproof construction scheme

    Coating process: roof waterproof construction scheme

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: roof waterproofing is a very important part of the construction project, but also for many years has not been well solved

    In the past, rigid and flexible waterproofing methods were widely used for roof waterproofing

    Rigid waterproofing is easy to crack and seep water due to temperature difference and strain, while flexible waterproofing is mostly made of asphalt, linoleum and other organic materials, which are easy to age and have short service life

    In recent years, a variety of new waterproof materials have come out one after another

    The most commonly used roof waterproof coating is Maxus K11 waterproof coating

    Here's the construction scheme of roof waterproof

    Roof waterproof base requires that the structural layer of waterproof roof should be Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint

    In fact, there is no ugly color in the wall paint, only the disharmonious color matching

    The use of wall color contains the knowledge of health

    Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health

    Grasp the basic principles of wall color and paint a colorful space

    1、 Wall paint color selection notice 1

    Light color is generally used for the top surface

    Light colors make people feel light, dark colors make people feel heavy

    Usually, the treatment of rooms is from top to bottom, from shallow to deep

    For example, the ceiling and walls of rooms are white and Paint Home News: roof waterproofing is a very important part of the construction project, but also for many years has not been a good problem to solve

    In the past, rigid and flexible waterproofing methods were widely used for roof waterproofing

    Rigid waterproofing is easy to crack and seep water due to temperature difference and strain, while flexible waterproofing is mostly made of asphalt, linoleum and other organic materials, which are easy to age and have short service life

    In recent years, a variety of new waterproof materials have come out one after another

    The most commonly used roof waterproof coating is Maxus K11 waterproof coating

    Here's the construction scheme of roof waterproof

    Requirements for roof waterproof base The structural layer of the waterproof roof should be cast-in-place

    When the prefabricated reinforced concrete hollow slab is used, the roof slab shall be grouted with 0 # mortar, and the C20 fine aggregate concrete shall be used for joint pouring

    The concrete for joint pouring shall be mixed with micro expansion agent, and each joint shall be grouted twice

    When the joint width of the roof slab is more than 40mm, the structural reinforcement must be set in the joint, and the joint at the end of the slab shall be sealed after initial setting, After one week of maintenance, drain water to check whether there is leakage

    If leakage is found, use 1:2 mortar to fill

    1、 The setting and practice of the dividing joint the dividing joint shall be set at the supporting end of the roof panel, the joint of the roof turning point, the waterproof layer and the protruding roof, and shall be aligned with the roof panel joint, so that the waterproof layer cracks caused by the influence of the temperature difference, the deformation of the concrete shrinkage structure and other factors are concentrated at the dividing joint, so as to avoid the board surface cracking

    The spacing between the grid joints should not be too large

    When it is more than 6m, a "V" grid joint should be set in the middle, and the depth of the grid joint should be throughout the thickness of the whole waterproof layer

    When the grid joint is also used as the exhaust duct, the joint can be widened appropriately, and the exhaust hole shall be set for air outlet

    When the roof adopts oil, asphalt and linoleum as the waterproof layer, the grid joint shall be added with 200 mm-300 mm wide linoleum, which shall be pasted on one side with asphalt glue, and the grid joint shall be filled with ointment

    2、 The method of roof leveling layer is the combination of building slope and structure slope

    After slope making according to 3% structure, 1:6 cement shall be used on the structure layer For slope making with expansion concrete stone, a 25mm thick 1:2.5 cement mortar leveling layer shall be made

    When building slope making, the flashing slope and flow direction shall be determined

    The thickness of the highest point and the outlet shall not be less than 30mm

    When pouring, the roller and ruler shall be used to roll, press and compact

    3、 Here, we should emphasize the importance of the roof isolation layer

    In areas with heavy acid rain, high humidity and strong corrosiveness, the common practice of the construction company is to brush cold primer oil on the leveling layer as the isolation layer, and then pour the rigid waterproof layer

    In order to ensure that the roof does not leak during the three-year warranty period, a two cloth three oil waterproof layer is made on the rigid layer

    When the project is accepted, Party A sees that the black oil on the roof is good-looking

    In fact, this way, the oil Paste on the surface, easy to aging, service life is not long, three years later to make up for leakage

    In order to avoid this kind of situation, the waterproof layer of two cloth and three oil roll material on the surface is used between the leveling layer and the rigid layer in accordance with the local conditions in the construction, which not only plays the role of the isolation layer, but also is not exposed to the sun and rain, which not only prevents the aging of the ointment, but also plays the role of waterproof

    During the construction of waterproof layer of coiled material, the following points shall be paid attention to: (1) the base layer shall be coated with the base treatment agent, which shall be thin and uniform

    Generally, after drying, the coiled material can be paved and pasted only when it is not sticky; (2) Generally, the coiled material waterproof layer shall be paved from the lowest elevation of the layer upward parallel to the roof ridge to make the coiled material lap in the direction of water flow

    When the roof slope is greater than 10%, the coiled material shall be paved perpendicular to the direction of the roof ridge; (3) Laying method: strip the isolation paper on the ridge of the coil, paste the coil on the surface of the base course, keep the long side overlapping of the coil for 50 mm, and the short side overlapping for 70 mm

    The coil shall be kept in a state of natural relaxation, and shall not be pulled too tight

    After the coil is laid, it shall be fully compacted with a plane vibrator immediately, and the vertical part shall be compacted with a rubber hammer; (4) Lap bonding of coiled material: after the coiled material is compacted, the lap joint shall be opened, and the lap bonding agent shall be evenly brushed with a paint brush

    When the two bonding surfaces of the coiled material joint are opened, and dry for a moment after coating, the adhesive can be carried out, and then the rubber hammer shall be used to compact, so as to avoid water leakage; (5) the construction temperature of the waterproof layer shall be more than 5 ℃

    The roof waterproofing should be in strict accordance with the construction process I

    construction preparation I

    material coating K11 is a two-component polymer modified cement-based waterproof material

    The product produces chemical reaction under the drive of water, forming a salt like crystal infiltrating into the pores inside the base material and forming a whole with the base material

    No matter on the base surface of concrete, metal, wood, paint, etc., it has a strong adhesive force

    After dry consolidation, it becomes an efficient waterproof layer

    The waterproof layer can be directly used for subsequent construction without any protective layer

    This product is suitable for all kinds of building base

    See the product description for its performance index


    Main tools (1) base cleaning tools: hammer, chisel, shovel, wire brush, broom, etc

    (2) Reclaiming and batching tools: platform scale, agitator, material cylinder, etc

    (3) Coating tools: rolling brush, scraping brush, brush, etc


    The working conditions (1) can be constructed on wet or dry foundation surface

    (2) The base (leveling layer) can be trowelled and polished with cement mortar, which is solid and flat without sand

    It is required to be basically dry

    If the base is too wet, it can be treated with impermeable and leakproof materials for the wet base, and the waterproof layer can be made after the surface is dry

    (3) The flashing slope shall be more than 2% and no water shall be accumulated

    (4) the cement mortar shall be plastered into small round corners at the corners of the base course

    (5) The pipe fittings, floor drains and drainage outlets connected with the base course shall be firmly installed before the construction of the waterproof layer

    The construction of waterproof layer shall not be carried out before the reserved pipeline is installed

    The end of cement mortar at the corner shall be smooth, and the pipe root shall be filled with sealing paste according to the design requirements

    2、 Construction process 1

    Process flow cleaning local waterproof additional layer waterproof layer waterproof layer water test protective layer project quality acceptance 2

    See product description for waterproof coating mix proportion


    Theoretical dosage: when the dry film thickness is 1.0mm, it is 1.9kg/m2


    Thickness requirements: roof waterproof grade of the project: class I, class II, class III building category is particularly important or has special requirements for waterproof building and high-rise building general building waterproof layer reasonable service life: 25 years, 15 years, 10 years, three or more waterproof layers, two waterproof layers, one waterproof layer, thickness of waterproof coating ≥ 1.5mm ≥ 1.5mm ≥ 2.0mm 5

    Key points for operation (1) the base surface must be cleaned thoroughly without floating dust, sundries, open water, etc

    (2) Coating waterproof layer a and bottom layer materials: special personnel shall be responsible for weighing and preparing materials

    First, the emulsion and powder used in the ingredients shall be weighed according to the mix proportion provided in Table 1, and the mixture shall be evenly stirred with a portable electric mixer

    It is recommended to mix for 7-10 minutes to make it free of undispersed powder


    before coating, the base surface shall be wetted to saturation, but no open water shall be left


    evenly brush several times with roller brush or paint brush until the specified film thickness is reached, and no leakage is allowed

    The next process can only be carried out after the coating is dry and solid

    When multiple coats are applied, the direction of each coat shall be perpendicular to the direction of the previous coat to achieve better coverage

    (3) Local waterproof additional layer shall seal or strengthen the parts prone to water leakage


    the additional layer at the junction of gutter, eaves gutter and roof should be laid empty, and the width of the empty pavement should be 200 ~ 300 mm

    When the roof is provided with a thermal insulation layer, the gutter and eaves gutter should be provided with a thermal insulation layer


    the end of the coating waterproof layer at the cornice shall be painted with waterproof coating for many times or sealed with sealing materials


    the coating waterproof layer at the flashing position should be directly painted under the coping of the parapet; the end treatment should be sealed with waterproof coating for many times

    The coping shall be waterproof

    D, the deformation joint should be filled with foamed plastic or bituminous hemp yarn, with padding material on top and covered with coiled material

    Top cover should be buckled with concrete cover or metal cover

    E and water drop cup should be considered in addition to the additional thickness of the additional layer and the dimension of the drainage slope

    The gradient within 500mm around the water outlet shall not be less than 5%

    It shall be sealed with waterproof coating, and the thickness shall not be less than 2mm

    A 20 mm wide and 20 mm deep groove shall be reserved at the contact between the water dropping cup and the base course, and the building sealing paste shall be embedded


    In the water spraying test, 48 hours after the last waterproof layer is dry fixed, 24 hours after the water spraying, no leakage is qualified


    The construction of the protective layer or the facing layer can be carried out after the water spraying test of the protective layer or the facing layer is qualified


    Construction temperature: 5 ~ 35 ℃

    Protection of finished roof waterproof products 1

    Operators shall strictly protect the finished coating waterproof layer

    When the film waterproof layer is not dry, it is strictly prohibited to trample on it; before the protective layer is made, any personnel irrelevant to waterproof operation shall not enter the construction site; after the first water test is qualified, the protective layer shall be made in time to avoid damage to the waterproof layer


    Floor drain or drain outlet shall be prevented from being blocked by sundries to ensure smooth drainage


    The waterproof layer shall be provided with a protective layer, which can be light colored paint, aluminum foil, granular sand, block material, cement mortar, fine aggregate concrete and other materials; the protective layer of cement mortar and fine aggregate concrete shall be provided with surface dividing joints

    Precautions for roof waterproof 1

    The configuration and construction of waterproof coating must be carried out in strict accordance with the technical requirements of the manufacturer

    The prepared waterproof coating shall be used up within 20 minutes


    The powder shall be stored in a dry place, and the emulsion shall be stored in a cool place with a temperature above 5 ℃

    Acceptance of roof waterproof works 1

    The construction unit shall provide the qualified test report and other archived data of on-site material retest


    The film thickness shall be uniform and meet the design requirements

    It is not allowed to have defects such as falling off, cracking, holes, bubbles or tight end


    There should be no ponding and leakage in the waterproof coating
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