During the operation of the building structure,structures, as well as various kinds of communication are constantly exposed to adverse weather factors. In order to protect them from contact with moisture and premature destruction, hydro-insulators are used. There are many types of such materials. At the same time one of the most popular is bitumen mastic. This tool is easy to apply and is inexpensive. Before processing it is important to make the appropriate calculations and find out the exact consumption of bitumen mastic per 1 m2 of waterproofing. This will allow you to work as efficiently as possible and prevent unnecessary spending.
The appointment of bitumen mastic
Be used this popular waterproofingmaterial can be used to process a variety of structural elements of buildings and structures. Most often, bitumen mastic is used for coating the underground parts of the foundation or plinths. Also, this tool is used for waterproofing flat roofs. Apply mastic and to protect basements and cellars from the penetration of groundwater. In this case, processing can be done both outside and inside. Very effective protection with the use of this material can be made for underground parts of various kinds of small architectural forms (gazebos, swings, children's slides, etc.). The lower ends of the fence posts are also often treated with this material.
Sometimes use mastic and for sticking strips.rolled waterproofing materials on different surfaces. This is done, for example, when finishing roofing or foundations with roofing felt. Often mastic is also used for processing pipes and communication wells.
Types of material
Bitumen mastic consumption per 1 m2 of waterproofingdepends primarily on its species. This material is a mixture of organic substances with astringent properties. Bituminous mastic can be classified on several grounds. There are, for example, cold and hot varieties of it. In the second case, the mastic is melted in a barrel before use. Cold option means initially has a liquid consistency.
In addition, mastic can be single ortwo component. The first option can be used immediately after purchase. Two-component mastics consist of 2 separate products that must be mixed before use. By the form of the basis of such funds are classified into rubber (elastic), oil and conventional polymer.
Consumption of bitumen mastic depending on the consistency
Of course, the thicker the material, the higher it will beconsumption. You can find out how much mastic is required for processing 1 m2 of surface, if you read the instructions for use. Manufacturers specify this indicator without fail. Consumption of hot mastic is usually less than cold. The fact is that the melted heated material lays on the surface as evenly as possible, does not form hillocks and holes. In addition, hot mastic practically does not shrink. As a result, consumption is reduced. In cold mastic, the consistency is usually more viscous than in melted. Therefore, for the treatment of surfaces it has to spend quite a lot.
Consumption depending on the number of layers
Disposable foundation or flat coatingRoof mastic usually does not give the desired result. Therefore, the surface is treated with the use of this material most often in 2-3 layers. This allows you to completely eliminate the contact of the smeared surface with moisture. The consumption of bitumen mastic per 1 m2 of waterproofing by the manufacturer is usually indicated only for one layer. Therefore, the figure in the instruction must be multiplied by 2 or 3.
Dry residue and layer thickness
Cold mastic, as opposed to hot, is usuallygives a very strong shrinkage. The amount of material present on the treated surface after evaporation of liquid substances is called the dry residue. This indicator for different types of mastic is not the same and can be 20-70%. Accordingly, the material with a dry residue of 20% will be spent about three times more than the funds with an index of 70%. Thus, the higher this figure, the faster and easier to perform work.
Consumption depending on the method of application
Work with bitumen mastic relies ontemperature from -10 to +50 ° C. Stir the material well before use. Mastic is applied to the surface, depending on the variety, with a brush, spray gun, spatula or roller. In the latter case, the layer is usually more even. Consequently, the consumption of bitumen mastic per 1 m2 of waterproofing is reduced. Also, the amount of money spent can be reduced by using a spray bottle. In this case, it is easy to dose the material with great precision.
Average consumption
For applying a layer of two millimeters is requiredabout three and a half kilograms of mastic per square meter in the dry residue, 1 mm - 1-2 kg. When processing the roof is often applied 3-4 layers of material. Therefore, the consumption of bitumen mastic per 1 m2 of roof waterproofing increases to 3-5 kg / m2. When gluing roofing material on the surface in one layer, usually no more than 250-800 grams of product per 1 m2 are used. The fact is that the continuous material in this case is usually not applied.
Расход битумной мастики на 1 м2 гидроизоляции pipes usually does not exceed one and a half kilograms. In this case, the most commonly used oil type of material. Mastic is applied on the pipe in 1-2 layers. In the latter case, the consumption, of course, will increase by about 2 times and will be 2-3 kg.
What other factors can influence
The amount required for surface treatmentmastic depends on the variety of the latter. With the waterproofing of concrete, as a material is very porous, the means go more than when painting wood. The fact is that in this case, the surface of the mastic simply absorbs. The tree also has pores, but small and not too large. The consumption of bitumen mastic per 1 m2 of waterproofing of a well from concrete rings, for example, will be more than for a monolithic tape of the base of the house (up to 3 kg). The same applies to foundations assembled from slabs. The fact is that in this case a part of the material absorbs the joints.
In addition, the amount spentdepends on whether the surface is processed - vertical or horizontal. Thus, the consumption of bitumen mastic per 1 m2 of waterproofing of the floor will be approximately 700-800 g. The walls will take at least 1-2 kg of the product when applied in one layer.
How to reduce mastic consumption
To save money processed materialcan first be primed. Most often, a primer is used for this purpose. Coat the surface with a brush or roller. Priming with this agent is usually carried out in one layer. The primer dries in a few hours.
In addition, to reduce consumptionbitumen mastic on 1 m2 of waterproofing the foundation or roof, you should carefully prepare the surface. The less cracks and chips it will have, the cheaper the waterproofing will be.
Cold mastic before use you needto stir thoroughly. Vertical surfaces are coated from top to bottom. If you do the opposite, the consumption of mastic will increase. Yes, and the operation itself in this case will be more difficult due to the resulting leaks. Before applying each subsequent layer should wait for the full drying of the previous one. It is easy to check the surface readiness for new coating. To do this, touch it with your finger. If it does not stick, then you can apply the next layer.
