Consumption of bitumen mastic for 1 m2 of waterproofing of foundation, roof, floor, pipes, well

In the process of operation, the structures of buildings, structures, as well as various communications, are constantly exposed to unfavorable weather factors. In order to protect them from contact with moisture and premature failure, waterproofing agents are used. There are many varieties of such materials. One of the most popular is bitumen mastic. This tool is simple in its application and is inexpensive. Before processing, it is important to make the appropriate calculations and to know the exact consumption of bitumen mastic for 1 m2 of waterproofing. This will make the work as efficiently as possible and avoid unnecessary waste.

Assignment of bitumen mastic

This popular waterproofing material can be used for processing a variety of structural elements of buildings and structures. Most often, bitumen mastic is used for the spreading of underground parts of the foundation or socles. It is also used for waterproofing flat roofs. Apply mastic and to protect the basement floors and cellars from the penetration of groundwater. In this case, the processing can be done both from the outside and from the inside. Very effective protection with the use of this material can be done for underground parts of various kinds of small architectural forms (gazebos, swings, slides, etc.). The lower ends of the fence poles are also often processed by this material.

Sometimes using mastic and for gluing strips of roll waterproofing materials on different surfaces. This is done, for example, when finishing roofs or foundations with a roofing material. Often mastic is also used for the processing of pipes and communication wells.

Types of material

The consumption of bitumen mastic for 1 m2 of waterproofing depends primarily on its variety. This material is a mixture of organic substances with astringent properties. The bituminous mastic can be classified according to several features. Distinguish, for example, its cold and hot varieties. In the second case, the mastic before melting is melted in a barrel. The cold version of the product initially has a liquid consistency.

In addition, mastic is one- or two-component. The first option can be used immediately after purchase. Two-component mastics consist of 2 separate agents, which must be mixed before use. By the type of basis, these agents are classified into rubber (elastic), oily and conventional polymeric.

The consumption of bitumen mastic, depending on the consistency

Of course, the thicker the material, the higher its consumption. To find out exactly how much mastic is required for processing 1 m2 of surface, you can, if you read the instructions for use. This indicator manufacturers specify without fail. The consumption of hot mastic is usually less than that of cold mastic. The fact is that melted hot material lies flat on the surface as much as possible, does not form bumps or holes. In addition, hot mastic practically does not shrink. As a result, consumption is also reduced. Cold mastic consistency is usually more viscous than that of melted. Therefore, for processing surfaces, it is necessary to spend quite a lot.

Consumption depending on the number of layers

One-time coating of a foundation or a flat roof with mastic usually does not give the desired result. Therefore, surfaces are treated using this material more often in 2-3 layers. This makes it possible 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 number in the instruction must be multiplied by 2 or 3 in the calculation.

Dry residue and layer thickness

Cold mastic, in contrast to hot, usually gives a very strong shrinkage. The amount of material present on the treated surface after the evaporation of liquid substances is called the dry residue. This indicator for different types of mastics is not the same and can be 20-70%. Accordingly, a material with a dry residue of 20% will be used approximately three times as much as funds with an index of 70%. Thus, the higher this indicator, the faster and easier to perform the work.

Dependent on the application method

It is recommended to work with bituminous mastics at a temperature of -10 to +50 ° C. Before use, the material should be thoroughly mixed. Apply the mastic to the surface depending on the variety with a brush, sprayer, spatula or roller. In the latter case, the layer usually turns out to be more even. Therefore, the consumption of bitumen mastic for 1 m2 of waterproofing is reduced. Also, the amount of money spent can be reduced by using a nebulizer. In this case, it is easy to dose the material with great accuracy.

Average flow rates

To apply a layer of two millimeters it takes about three and a half kilograms of mastic per square meter in a dry residue, in 1 mm - 1-2 kg. When processing roofs, 3-4 layers of material are usually applied. Therefore, the consumption of bitumen mastic for 1 m2 of roof waterproofing increases to 3-5 kg / m ² . When gluing a roofing material on a surface, no more than 250-800 grams of funds per m2 usually goes to one layer. The fact is that the solid material in this case is usually not applied.

The consumption of bitumen mastic per 1 m2 of waterproofing pipes usually does not exceed one and a half kilograms. In this case, the oil type of material is most often used. Apply mastic to the pipes in 1-2 layers. In the latter case, the consumption, of course, will increase approximately 2 times and amount to 2-3 kg.

What other factors can influence

The amount of mastic needed for surface treatment depends, in part, on the variety of the latter. When waterproofing concrete, as a very porous material, the funds go more than when the tree is smeared. The fact is that in this case the surface of a piece of mastic simply absorbs itself. The tree also has pores, but small and not in too much. The consumption of bitumen mastic per 1 m2 of the waterproofing of the well from concrete rings, for example, will be more than for a monolithic tape of the house's base (up to 3 kg). The same is true for foundations assembled from slabs. The fact is that in this case some of the material absorbs the joints.

In addition, the amount of money spent depends on which surface is treated - vertical or horizontal. So, the consumption of bitumen mastic for 1 m2 of floor waterproofing will be about 700-800 g. On the walls it will take at least 1-2 kg of funds when deposited in one layer.

How to reduce the consumption of mastic

To save money, the material to be processed can first be primed. Most often, a primer is used for this purpose. Smear 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 the consumption of bitumen mastic for 1 m2 of waterproofing the foundation or roof, you should carefully prepare the surface. The less it is cracked and chipped, the cheaper the waterproofing costs.

Cold mastic should be mixed thoroughly before use. Smearing of vertical surfaces is done from the top down. If to do the opposite, the consumption of the mastic will increase. Yes, and the operation itself in this case will perform more difficult because of the resulting streaks. Before applying each subsequent layer, you should wait until the previous one has dried completely. Check the surface readiness for a new coating is easy. To do this, you need to touch it with your finger. If it does not stick, then you can apply the next layer.