First, the purchase and construction of rock wool board
Roofing practices for construction drawing design:
1. Outdoor surface layer
2, 40 thick C20 fine stone concrete plus 4% waterproofing agent rigid waterproof layer, with Φ6 bidirectional steel bar in the middle distance 200, the original pulp light.
3, 20 thick clay mortar, the mixing ratio is lime paste: sand: clay = 1: 2.4: 3.6
4, 3 thick SBS modified asphalt waterproofing membrane
5, 20 thick 1:3 cement mortar screed
6, 55 thick rock wool board insulation layer. (Energy-saving design)
7, 25 thick 1:3 cement mortar screed
8, 1:6 cement slag to find the slope, the thinnest part is 40 thick
9. Brush the base layer treatment agent to emulsifie the asphalt twice, (the vapor barrier)
10, 20 thick 1:3 cement mortar screed
11. Reinforced concrete roof slab (original pulp collection)
The bulk density (density) of 55mm thick rock wool board on the market ranges from 70kg/m3 to 220kg/m3, and the production of rock wool board that meets specific requirements is restricted by various factors (such as: stone material variety, quality, production specifications). , bulk density, density, compression deformation coefficient, waterproof performance, etc.), the maximum size of vertical fiber rock wool board processing is 1200mm long * 150mm wide * 20mm ~ 100mm thick; flat fiber rock wool board processing maximum size is 1200mm long * 600mm wide *20mm ~ 100mm and so on. In addition, the bulk density of the rock wool board is more dense, the relative compression deformation is also small, and the compression deformation is small, and the maximum thickness that can be processed is relatively small. According to the requirements of current national standards, the compressive strength of rock wool board should be ≥40kPa (ie 4000kg/m2). Note: The national test standard has a deformation of 10% corresponding to the compressive strength of rock wool board.
Ordinary rock wool board is similar to sponge, and it has strong water absorption and is not suitable for reinforced concrete roofing. Waterproof rock wool is added with waterproof additive in production, so that the product has good moisture-proof and water-repellent properties. The price is ordinary rock wool board. Twice.
The combination of rock wool board and flexible waterproofing membrane can achieve the purpose of fireproof and heat preservation. The weight of rock wool used in the roof is about 140-180kg/m3, and the compressive strength of the roof rock wool board must be above 40KP.
The relationship between rock wool board density and compressive strength: 140 weight -40KP, 160 weight -60KP, 180 weight -80KP; (10% compression ratio)
Second, the use of rock wool board and its misunderstanding
The price of rock wool board is related to density and thickness. The density is above 140KG/m3, which belongs to high-density rock wool board. The following is low-density rock wool board. Taking the waterproof rock in Sichuan area as an example, the price and density of rock wool board are roughly as follows: Density price 100KG/m3 450 yuan/m3 120KG/m3 500 yuan/m3 140KG/m3 550 yuan/m3 160KG/m3 600 yuan/m3 180KG/m3 650 yuan/m3 Calculated according to the thickness of rock wool board of 55mm, equivalent to each square meter Price: 100KG/m3 24.75 yuan/m3 120KG/m3 27.5 yuan/m3 140KG/m3 30.25 yuan/m3 160KG/m3 33 yuan/m3 180KG/m3 35.75 yuan/m3 If 55mm thick rock wool board is used, the density is 100KG/m3 The price difference with the waterproof rock wool board with density of 180KG/m3 is 11 yuan/m2, so many construction units choose low-density rock wool board (80~120KG/m3) when purchasing rock wool board. Because the rock wool board is too soft, there should be no layer of rigid concrete layer (single layer two-way reinforcement Φ8@200). The price of C30 concrete is 300~350 yuan/m3, the thickness is 60mm, and the price of steel bar is 4000~4500 yuan/t. , the increased rigid concrete layer will increase the material cost by at least 34 yuan per square meter, plus the labor cost of making a layer of rigid concrete. Finally, from the design point of view, rock wool board is a new type of insulation material, many architects do not understand the performance of this material, the design drawings only express the thickness and thermal conductivity of rock wool board, to the insulation material The company left a lot of room for operation and brought a lot of trouble to the construction unit. In general, rock wool boards should also increase the requirements for compressive strength and water repellency.
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