Construction Process and Technology of External Insulation System for Dry Mortar of Modern House

Construction Science and Technology Information of Construction Technology and Technology of Dry Insulation System for Modern Residential Building Cai Yongsheng Wang Xiuhua (Jiamusi Dacheng Construction Co., Ltd.) is a new type of wall external thermal insulation construction system, which is mainly applicable to industrial and civil buildings requiring winter insulation and summer heat insulation. The bearing or non-load bearing wall. The system can minimize the energy consumption of industrial civil construction facilities. It is the most competitive system in today's building energy-saving wall, and it is very suitable for China's building energy-saving needs. After a certain number of pilot projects, it has obtained a larger Social and economic benefits.

The new dry mortar external insulation system is a very simple external thermal insulation technology. It has the features of simple and convenient construction, short design cycle, and less plots. It focuses on EPS board and exterior wall bonding, and it solves key technologies such as bond strength, crack resistance, freeze-thaw resistance, and has significant energy-saving effects. The insulation system has become the most competitive system in building energy-saving walls and is widely used, mainly depending on its performance advantages.

Compared with other energy-saving walls, its performance advantages are mainly reflected in the following aspects: The system construction method is flexible, simple and quick, and saves labor and material.

No heat bridge; light weight, can effectively increase the use of residential area.

And the base wall adhesive strength, system security.

Good water retention, good sag resistance.

It has good flexibility, freeze-thaw resistance, resistance to cracking, and good weather resistance.

Low water absorption, small shrinkage, no cracking, no emptying, no shedding.

Non-toxic, odorless, non-polluting, safe and environmentally friendly.

1 Construction process of mortar external insulation system 1.1 Construction preparation: Polystyrene board: 20Kg/m3 self-extinguishing and flame-retardant polystyrene foam insulation board, in line with GB10801-89-ZR. Reinforced alkali-resistant glass fiber mesh 160g /m2: The outer surface of all insulation boards. Durable alkali glass fiber mesh quality in line with JC/T841-99; gray sword outer wall insulation bonding, plastering dry powder; mixing tools: mixer, bucket; cutting tool: hand according to; plaster tools: pallets, flat trowel, Sawtooth trowel and gray shovel; Measuring tools: scales; Detection type: 2 meters on the ruler, line fall; Auxiliary tools: Broom, rag, white line, transparent tape, ink fountain; 1.2 Construction process Flow: Base wall cleaning - Put-line-paste and turn-wrapped mesh - Paste polystyrene board - Coated surface dry powder - Inlaid mesh cloth - Scrape trimming - Inlaying deformation joints - Decorative layer construction 2 Construction technology of a new dry mortar external insulation system The system achieves the energy-saving effect of design, maximizes social and economic benefits, and strictly controls the quality of incoming materials and strict construction techniques in applications.

The main construction technology of the dry mortar external insulation system is the system construction process, that is, the entry material inspection is a basic layer of wall treatment, a cutting polyphenyl board, a configuration of dry mortar, a paste of polystyrene board, an anchor, an anchor and a sticky glass fiber net. Brush the flexible surface coating. The main points of construction are: Inspection of incoming raw materials. The dry powder mortar, benzene board, anchor bolts, and glass fiber nets entering the market shall be inspected for their certificates of conformity, manufacturer inspection reports, market access certificates, etc., and shall meet the requirements of the supervisory inspection site to witness sampling, and shall be permitted to use only after passing inspection by relevant departments. Mixing dry powder water must comply with the "Concrete Mixing Water Standard" provisions.

Base wall treatment. Remove floating ash, floating soil, oil stains, and other materials that interfere with bonding on the construction substrate. Check the verticality of the wall is less than 3mm/2m, the flatness requirement is less than 2mm/2m, the deficiency is leveled with 1:3 mortar and the base is dry.

Cut polystyrene board. According to the size of the exterior wall of the building, the size of the main and sub-board blanks shall be selected. The length of the main specification board shall be 2:1. The standard board shall be 1200 mm and 600 mm. The thickness of the benzene board should be selected based on the building coefficient of the building, the average outdoor temperature, and the type of the base wall. Cutting benzene board, cutting with a heating resistance wire to ensure accurate benzene board size.

Configure dry mortar. Add water first, add dry powder, stir with a special tool to form a uniform and soft paste, and let it stand for 5 minutes before stirring. The mortar should be used along with stirring. The well-mixed mortar must be used within 2 hours. It is forbidden to dilute it with secondary water, and it must not be mixed with cement, sand, antifreeze and other materials.

Paste polystyrene board. According to the engineering situation, it can be laid horizontally from bottom to top or from top to bottom. Adjacent benzene plates should be staggered and overlapped. The length of the staggered seam should be 1/2 plate long, and the corners should be bitten and lapped. Adhere to the starting line before bonding. Generally, the benzene board is pasted with a dot frame method when pasting; the well-mixed dry mortar is evenly applied on the circumference of the polystyrene board and the six mortar spots are evenly distributed on the blank space, and then placed in place according to the prescribed wall surface. Use a hand or a rubber mallet to press hardly on the entire surface of the board while adjusting the flatness and verticality of the board surface. The width of the mortar around the flat polystyrene board is about 60 mm and the thickness is about 3.55 mm. The diameter of the six points is about For 104 mm, the total dry mortar adhesion area is not less than 35% of the total area of ​​the board. The board-to-board joints should be tight and there must be no visible gaps. The mortar squeezed into the side of the board when it is applied should be cleaned. After the polyphenyl board is pasted, it needs to stand for 1 day.

Anchors are anchored. If the design requires anchoring, use a percussion drill to drill a minimum hole depth of 95 mm on the polystyrene-coated base wall, and insert the anchor into the polystyrene board and lightly tack it until the anchor is disc-shaped. The cap is pressed tightly on the polyphenyl board. The effective anchoring depth of anchors should not be less than 25 mm, the diameter of plastic discs should not be less than 50 mm, and the tensile strength should be 0.3 kilo-joules or more. The number of anchors per square meter is generally paving the glass fiber web. A layer of dry mortar was scraped on the spread polyphenyl board. The scraped area was slightly larger than the length and width of the mesh and the thickness was uniform and not less than 2 mm. The glass fiber mesh is affixed to the mortar and the surface is embossed and smoothed with a spatula so that the mesh is not creased and exposed on the surface of the mortar layer. At 1 meter, there is no visible visible grid pattern (usually the total thickness of the outer mortar and glass fiber net of the polystyrene board is 2.54 mm, and the broken web should be located about 1/3 of the mortar surface of the entire shield). The grid cloths should be overlapped with each other. The site where the seams are cut off should be patched and overlapped. The overlap length between the grids should not be less than 100 mm.

In the areas of loose water, door and window openings, air conditioning openings, expansion joints, parapets, and wall-ends, additional edging nets are required. The dimensions are plate bottom and board surface are not less than 100 mm. Reinforcement mesh is required at the bottom wall. The reinforcement network should be laid after the standard network is laid for 24 hours. The overall mesh laying sequence is a edging mesh + standard network strong network.

Brush the flexible surface. 24 hours after the completion of all the wall coverings, the top coat can be applied. The top coat should be provided with a matching flexible putty.

During construction, it should be noted that the construction temperature of the entire system should be higher than 5*C, and the wind power should be less than 5; the mortar should not be mixed with other materials; the mortar should be used when avoiding exposure, fire, etc. to prevent the mortar from being used again. Rapid loss of water in a short time; in order to ensure the permeability of the wall, the inner surface of the base wall should not use airtight materials.

Although the mortar external insulation system has been widely used in recent years, whether it can give full play to its performance to make the project to obtain greater economic benefits and construction methods are directly related to the right or wrong. In the construction of the project, construction methods should be strictly followed to ensure that the superiority of the system is fully realized.