Waterproofing membrane roof construction and quality control
【Abstract】 roof leakage is the most common building common problem, to ensure that water quality of the projects, design is the premise, construction is the key, but also choose a suitable waterproof material.
Now with engineering to talk about the PVC waterproofing membrane in roof construction in the quality control.
Key words design requirements; waterproof material; quality control; construction
【Abstract】 The construction of roof leakage is the most common common problem, to ensure that water quality of the projects, design is the premise, construction is the key, but also choose a suitable waterproof material. With engineering to talk about PVC waterproofing membrane in
roof construction in the quality control.
【Key words】 Design requirement; Waterproof material; Quality control; Construction
Roofing project is an important project for housing construction, engineering, building a direct impact on the quality of life, household production and life. Roof leakage is the most common building common problem, to ensure that water quality of the projects, design is the premise, construction is the key, but also choose a suitable waterproof
material. Especially in southern China, high temperature, solar radiation intense, rain, waterproof materials, the choice is even more important. Now with engineering to talk about the PVC waterproofing membrane in roof construction in the quality control.
2. Roof slope design requirements
Slope is the roof drainage, the primary basis for waterproofing. This project dormitory roof structure is designed to find slope. Based on the design of the roof fell into the water port location of the division
drainage area. Generally housing sub-surface horizontal width of the
center line for the roof, the balcony I fell into the water against the reverse slope, the vertical division of a two fell into the sea region between the mouth Ridge. Drainage slope in the i = 2% -3%, this would
reduce the ills of roof water.
3. Correct choice of waterproof material
The choice of waterproofing materials waterproofing years of quality and durability have great influence, the correct choice, the
rational use of water-proof roofing material is key to the success of the design, although a wide range of flexible waterproof material, the performance of different, previously used 2 mm thick layer of asphalt membrane, puncture-resistant layer with a sand-poor performance, poor low
temperature flexibility, easy to aging, water-proof layer of durable short
life. The PVC modified bitumen membranes, has anti-aging, weathering
resistance, elongation big, long service life. At the same time construction of simple, low cost, easy maintenance, the use of effect is good.
PVC waterproofing membrane performance requirements as follows: Tensile strength: longitudinal ? 7.0 MPa, transverse ? 7.0 MPa.
Elongation: longitudinal ? 150%, horizontal ? 150%. Tension:
longitudinal ? 70, horizontal ? 60, resistance heat 90 ?, low-
temperature bending nature: -20 ?, no crack. Anti-permeability: 0.2 MPa,
24 Xiaoshi waterproof, anti-perforated impermeable.
4. Leveling layer of cement mortar quality control
Leveling waterproofing membrane layer is Paving the grassroots to
the waterproofing membrane to provide a smooth, dense, there is strength, to bond the construction of the basis. When the grass-roots level of
concrete as a whole, the use of cement mortar leveling layer, the thickness of 20mm, the ratio of cement and mortar 1:2.5-1:3 (volume
ratio), cement grade of not less than 32.5. Screed tier would also like to set up sub-lattice seam, and embedded filling sealing material, so that it can avoid or reduce the leveling layer of cracking, so that when the structural deformation or deformation temperature, waterproof layer will be the formation of cracks, resulting in resulting in leakage. Aperture of 20mm, sub-vertical and horizontal grid spacing of joints is not greater than 6m, sub-grid seam located at the roof of the extension end of the
roof waterproofing layer and the prominent corner of the junction of roof components, waterproof layer and the parapet junction and so on. And should be aligned with the plate side seam, even straight. Leveling layer
of cement mortar during the construction, first floor roof to clean up debris, and watering moist. In laying mortar, press from far to near, from high to low procedure, each sub-grid at one time continuous paved,
according to design a good control of slope, with more than 2m length of
the scraping bar Calibrating until the mortar is slightly water received, the compaction with the trowel smoothing, 12 hours later covered by straw bags and water conservation. For the prominent roof of the structure and piping detail the root node should be done such as circular, square cone cone Taiwan or Taiwan, and the concrete made with fine stones in order to avoid the node positions Stones roll fracture, which will help real Zhanlao sticky. Reposted elsewhere in the paper for free download http://
(1) Mizuochi mouth: around 500 mm made within the scope, slope ?
5%, and smooth.
(2), parapet wall and out the flue roof, stairs made of layers of the roots of arc radius of 80 mm, made of concrete with small stones.
(3) The extended roof piping around the roots, with small square cone made of stone concrete units, coned bottom width of 300 mm, high 60 mm, the entire flat wiping light.
5. Coil construction Laying and quality requirements
5.1 Roll Stones pre-leveling floor to check whether the quality
meets the requirements, to achieve a solid grass-roots level, flat, dry,
non-soil debris, and folders in order to carry out the waterproofing works. Especially when the grass-roots level, when wet, such as the laying
of waterproofing membrane material will appear Stones is not strong, water leakage, resulting in failure of waterproofing effect.
5.2 Coil Paving Stones ridge parallel to the direction of all the parallel ridge of the tie-cis-flowing water according to the direction of
lap joints, using rolling shop paste construction method.
5.3 Brushing the surface of the grass roots: in the dry brushing the grass-roots uniformly about 1 mm thick layer of adhesive (when the binder when the partial thick or too thick, use slow fire slow heating, the temperature should not be too high), we must guard against the a coated roll back and forth in order to avoid the end of glue to "bite" So, the formation of gel and compromise quality. Brushing the grass-roots
adhesives, we should pay special attention to yin and yang, angle, flat facade corner, roll closed head Office, the outfall pipe out the roof
parts of the roots of peer nodes.