Bituminous mastic for waterproofing - types , calculation and application

Erected with love home, needs to be protected, and, above all, of the moisture.From waterproofing quality it depends how long will the foundation and roof.Among the variety of modern materials there is one that provides a seamless airtight protection from water even in hard to reach areas and on difficult surfaces at an affordable price - is mastic asphalt.

Nowadays asphalt mastic - a "cocktail" of natural bitumen (one of the products of oil refining) and synthetic components of modifier to increase the service life of the coating, grip and ease of application.It is suitable not only for waterproofing surfaces made of bricks, concrete and wood, but irregularities putty, filling the cracks, gluing roofing membranes.Mastic has obvious advantages such as high flexibility, the ability to hold on almost all surfaces, cracks and fractures for a long time, resistance to aggressive environments.

Types mastics

Modern mastic different manufacturers, with the basis of bitumen, different properties and composition of the additives.The main groups:

• mastic asphalt - traditional inexpensive material,
• mastic bituminous - coating with high elasticity and resistance to external influences,
• mastic bitumen emulsion - intended for pre-treatment of surfaces prior to waterproofing, also called "primers" (aboutthey can be read here) are more liquid consistency,
• mastic bitumen-polymer - compounds with the addition of synthetic rubber, plasticizers, solvents that increase the lifetime and quality of coverage.

By way of application of the mastic are divided into hot and cold.To cover her hot mastic required preheat a gas burner, or in a special tank, cold mastics advantage is that they do not require this time-consuming and dangerous operation.However, heated mastic faster and penetrate deeper into the pores of the material being processed, they can be recommended in cases where you need extra protection and available equipment for heating.

There are one- and two-component mastic.The first is already fully ready to spray, they should only be mixed thoroughly before use.The latter require the addition of the active composition, and then quickly begin to harden.The advantage of two-component pastes in a long term storage - more than a year, while as for the one-component is much smaller.

Bituminous sealant designed specifically for sealing, in its composition has a sealant, which after solidification forms a thick protective layer.Also, it may include preservatives and herbicides for additional protection of the building against mold.

amount calculation

purchasing bitumen mastic, it is necessary to take into account that its consumption varies greatly by brand, manufacturer, and, most importantly, the material and the porosity of the surface.On average, it amounts to 250 g / m².Apply sealant to improve waterproofing in two layers.Before buying it should be clarified whether the preliminary application under mastic primer, as well as additional dilution solvents it is necessary.

Waterproofing using mastic

applied mastic asphalt is quite simply without the use of special equipment.Pre surface thoroughly cleaned of debris and dust, fully dried, though now there are mastic, which allowed to cover the wet surface.Mastic can be installed on old asphalt covering, if it is to preserve the integrity, metal construction with rust traces.Threatening the integrity of the waterproofing mastic sharp protruding edges and faces, so make sure to work in their absence, and remove all the biting projections.If necessary

beforehand applied 1-2 primer layer or primer using a roller, brush or sprayer.

For cold mastic sufficiently wide flat brush or a roller, or a wide spatula for thicker compositions.You can apply the mastic in bulk and then leveling, most importantly, follow the uniform coating thickness.Layers must be solid, strip should be parallel to each other.If the sealant is applied to the vertical surface, it is made from the bottom up.

Exterior waterproofing the basement and the basement is performed by applying 2-4 layers of mastic asphalt with a total thickness of 2 to 6 cm with the strengthening of reinforcing mesh.The coating thickness depends on the depth of the basement and the ground water level.For walls rather 2 layers.A new layer of mastic applied only after complete drying of the previous one.Drying time depends on the composition of funds, the temperature and humidity of the environment.Dry layer ceases to stick to hands.Violation of this rule can lead to delamination or deterioration of the mastic traction.

properly applied sealant will protect the foundation, basement, walls and roof of 20-50 years.