The leveling layer shall also be provided with dividing joints and embedded with sealing materials, so as to avoid or reduce the cracking of the leveling layer, so that when the structure is deformed or the temperature difference is deformed, the waterproof layer will not form cracks, resulting in leakage.
1.
7、 For the details of waterproof coiled material, the base course at the intersection of flashing and roof shall be made into obtuse angle (> 1350) or circular arc (r = 50 ~ 100mm).
It shall be aligned with the end seam of the plate, uniform and straight.
For the structure protruding from the roof and the detailed nodes such as the root of the pipe, circular arc, conical platform or square conical platform shall be made, and made of fine aggregate concrete, so as to avoid the folding and cracking of the coiled material paving at the node and facilitate the bonding.
This coiled material is resistant to low temperature and is not easy to be frozen under negative temperature.
The roots of parapet, roof flue and stair floor are made into arc with a radius of 80mm and made of fine stone concrete.
2.
When checked with a 2m long ruler, the gap between the ruler and the surface of the leveling layer shall not exceed 5mm, and the gap is only allowed to change gently, and there shall not be more than one place per meter.
8、 Protect the roof waterproof roll.
The spraying and brushing shall be thin and uniform, and shall not leak white or peel too thick.
Before spraying and coating cold primer oil and base treatment agent, check the dryness of the leveling layer and clean it, and then use a brush to treat the nodes, surroundings, corners and other parts of the roof first, and finally spray and brush in a large area.
After filling the cracks, flatten them with rollers.
Waterproof coiled material series products of jinshai company ↑ IV.
Rain, snow, frost, fog, excessive atmospheric humidity and windy weather are not suitable for outdoor operation, otherwise corresponding technical measures shall be taken.
Therefore, the leveling layer paved with coiled materials shall be solid without protruding sharp corners, pits or surface sanding.
The joint width is 20mm, and the longitudinal and transverse spacing of the dividing joint is no more than 6m.
When paving gutter and eaves gutter coiled materials, it is better to follow the direction of gutter and eaves to reduce overlapping.
2.
The roll up height of waterproof layer to the vertical surface shall not be less than 250mm, usually 300mm; The closing of coiled material shall be tight to prevent water seepage at the closing.
When the roof slope is less than 3%, the coiled material should be paved parallel to the roof ridge; When the roof slope is 3% ~ 15%, the coiled material can be paved parallel or perpendicular to the ridge; When the roof slope is greater than 15% or subject to vibration, the asphalt coiled material shall be paved perpendicular to the ridge, and others can be paved parallel or perpendicular to the ridge according to the actual situation.
When paving multi span and high-low span roofs, it shall be carried out in the order of high before low, far before near.
Key points of roof waterproof construction I.
The slope shall be controlled according to the design, and scraped with a scraper rod with a length of more than 2m.
Jinshui waterproof supermarket covers SBS, self-adhesive, HDPE non asphalt based self-adhesive membrane waterproof coiled materials, high molecular polyethylene polypropylene (polyester) fiber waterproof coiled materials, waterproof coatings, waterproof accessories and other series of products, basically realizing the full satisfaction of products and full coverage of functions.
Each sub grid shall be paved continuously.
The construction can be continued only when the concrete strength grade reaches C15.
Expansion cement or concrete mixed with expansion agent shall be used for joint filling as far as possible; When the width of the gap between slabs is greater than 40mm, reinforcement or reinforcement configured according to the design requirements shall be set in the slab joint.
Waterproof coating series products of jinshai company ↑ VI.
When selecting, it shall be compatible with the material of coiled materials to avoid corrosion of coiled materials or poor adhesion.
Jinshuai waterproof supermarket can meet the waterproof needs of different regions, different forms and different structural parts, and use high-quality products to serve high-quality projects..
When the short side overlap is necessary, measures shall be taken to prevent the coil from sliding at the overlap.
The longitudinal gradient of gutter and eaves gutter shall not be less than 1%, and the drop at the bottom of the gutter shall not exceed 200mm.
The coiled materials of each layer laid in layers shall be overlapped by cross connection method at the connection between gutter and roof, and the overlapping joints shall be staggered; The joint should be left on the roof or gutter side, not at the ditch bottom.
Sequence of laying coiled materials: during the construction of waterproof layer, the nodes, additional layers and parts with concentrated roof drainage (such as the connection between roof and gutter, cornice, gutter, roof corner, slab end joint, etc.) shall be treated first, and then the construction shall be carried out upward from the lowest elevation of roof.
After pouring the slab joint concrete, it shall be covered and watered for 7 days.
The cold primer oil shall be applied 1 ~ 2 days before paving, and the coiled material shall not be paved until the base treatment agent is dry about 4 days after brushing.
The lap joint parallel to the ridge shall be lapped along the water flow direction: the lap joint perpendicular to the ridge shall be lapped along the local and dominant wind direction.
The gradient within 500mm around the water outlet shall not be less than 5%.
The leveling layer is the base layer for paving the coiled material waterproof layer, providing a flat, dense, strong and adhesive structural foundation for the waterproof coiled material.
3、 The treatment of gaps and cracks in the roof base course is precast concrete slab.
3.
Hot melt paving coiled material can be constructed under the temperature above – 10 ℃.
The waterproof cornice of coiled material is divided into free falling, external cornice and gutter in parapet.
The corner formed by the adjacent surface of the leveling layer shall be made into an arc or obtuse angle.
After the mortar is slightly watered, it shall be compacted and troweled with a trowel.
From the cornice to the ridge layer by layer, all kinds of coiled materials shall be overlapped up and down, the overlapping positions of multi-layer coiled materials shall be staggered, and the upper and lower coiled materials shall not be paved vertically.
3.
Laying direction of coiled materials: the laying direction of coiled materials shall be determined according to the roof slope and whether the roof has vibration.
laying of coiled materials 1.
Prevent the joint pouring concrete from bearing the influence of construction load too early and ensure the bonding strength between plates.
Water outlet: made within 500mm around, with gradient ≥ 5% and smooth.
2、 Requirements for roof drainage slope: the drainage slope of flat roof is 2% ~ 3%.
The bottom surface of the cone is 300mm wide and 60mm high, which shall be leveled and troweled.
After 12 hours, it shall be covered with straw bags and watered for maintenance.
The commonly used base course treatment agents include cold primer oil and primer (base course treatment agent) matched with various polymer modified asphalt coiled materials and synthetic polymer coiled materials.
After the waterproof roll is paved, it must be protected to avoid affecting the waterproof effect.
5、 Base course treatment agent in order to strengthen the adhesion between waterproof coiled material and base course and ensure integrity, the coating on the base course shall be painted in advance before the construction of waterproof layer.
When the slope is less than or equal to 2%, materials should be selected for slope making; When the gradient is greater than 3%, structural slope making should be selected.
When the base course is monolithic concrete, the cement mortar leveling layer with a thickness of 20mm, the ratio of cement to mortar is 1:2.5 ~ 1:3 (volume ratio), and the cement grade is not less than 42.5.
When the base course is cast-in-situ reinforced concrete, when there are cracks in the slab, first chisel the cracks into a groove 15 ~ 20mm wide and deep, and then remove the stone residue, blow the groove clean, fill the cracks with joint filler twice or three times, and the interval must be 15 minutes.
The dividing joint is located at the supporting end of the roof slab, the junction between the waterproof layer and the protruding roof components at the roof corner, and the junction between the waterproof layer and the parapet.
During the construction of cement mortar leveling course, the sundries on the roof and floor slab shall be cleaned and watered.
Stretch out around the root of the roof pipe, and make a square cone with fine aggregate concrete.
The stone particle size shall not be greater than 10mm, and its strength grade shall not be less than C20.
environmental requirements of construction in order to ensure the quality of construction operation and coiled material paving, the construction should be carried out at the temperature of + 5 ℃ ~ + 35 ℃; High polymer modified asphalt and polymer waterproof coiled material should not be constructed below negative temperature.
Lap method and width of coiled materials: lap method is adopted for paving coiled materials, and the lap joints of upper and lower layers and two adjacent coiled materials shall be staggered.
When the gap width between slabs is less than 20mm, fine aggregate concrete shall be used for joint filling.
requirements of roof leveling layer.
For the arch roof with a slope of more than 25% and the slope under the skylight, the short side overlap shall be avoided as far as possible.
The mortar shall be laid from far to near and from high to low.
