Warming of the blind area to extend the service life of the foundation

Warming blind area using foam

As you know, the usual blind area just removes falling throughout the year precipitation and melt water, to which concrete strip is made with a bias to home.However, if we restrict one concreting and asphalting sand-gravel cushion to protect the foundation and the base will be only moisture, but not from the freezing of the soil.Therefore, if severe frost in your area are not uncommon, insulation blind area becomes an absolute necessity, as well as the cap insulation polystyrene or other suitable insulation.It remains only to decide which materials are used to provide high-quality insulation.If we talk about modern insulation and do not think about the cost of the material, the ideal option would be a polyurethane foam, recommended by many experts because of the reduction with the help of the timing of work.

otmostki width should be at least 60 centimeters, but it is determined by, firstly, the removal of the eaves of the roof (insulated strip it should be wider by at least 20 centimeters), and secondly, on the soil type.Typically, blind area make the width of the order of 100-120 centimeters, because the accepted width thermal barrier making the appropriate depth of soil freezing, and at a depth of about 2 meters the temperature is always above zero.For polyurethane foam insulation on the blind area allotted for the strip along the house is removed soil to a depth of top soil, that is 15-20 cm and removed the remains of plant roots, preparing formwork height of up to 40 centimeters.The resulting shallow trench is poured a layer of sand 10 cm thick, followed by careful tamping.Top poured gravel, a layer thickness of up to 15 centimeters, and then ramming.

Now comes the time of polyurethane foam, which is sprayed directly on the gravel, which is necessary only for escaping under pressure of hundreds of atmospheres are not part of scattered sand.A layer of foam usually does not exceed 5 centimeters, it hardens within 15 minutes.Concrete can be poured directly onto the insulation, its thickness should be about 5 cm, to avoid the appearance of cracks due to thermal expansion.Special techniques have in the process, not including exhibiting gradient of 5 to 10 centimeters per meter, it is only necessary to remember that thicker layer of concrete, the greater the likelihood of cracking during otmostki .For if not eliminate, at least take control of their appearance, rather every few meters to create artificial joints between the individual filling portions.Cracks appear in the future, but it is for these pre-prepared seams.

Warming otmostki foam as the most cheapest way

estimated that one meter of polyurethane blind area costs about 8500 rubles, the substrate layer of insulation thickness of only 5 cm.Expensive?Perhaps, but quickly.If you take your time, and you want to save money on something useful or to the soul, then you better perform insulation foam blind area - the cheapest material of the existing insulation.

as insulation blind area is best to use extruded polystyrene, but you can do the usual foam foam, manufactured in mats or slabs.

detailed process works as follows: as with polyurethane foam, the ground around the perimeter of the building should be removed in the plant layer depth and the width of the blind area of ​​the future.Then the land is leveled, it does not matter when spraying foam.As usual, created pyatnadtsatisantimetrovaya sand cushion thickness of 15 centimeters, of course, well rammed.But you'll need more foam.The fact that the polyurethane foam immediately and without joints sticks to the cap, and the foam plate is left gap that must be filled with foam.Ideally, at the same time it would be good to perform heat insulation of the plinth at home if it was not done before.Next, we provide a coupler, placing on the angle between the blind area and reinforced mesh cap, laid on top of the foam roofing material for better waterproofing, and it all poured concrete.

additional warming of the blind area when a particularly deep freezing of the soil

If your region is very harsh winter, there is a risk that the soil be chilled at depth and under the blind area, reaching thus the foundation.Even if the foundation is not flush, that freezing will go under it, there is no good, there can be formed even permafrost.The best solution - addition to the blind area, put on its edge as a continuation, but at an angle of 50-60 degrees in soil depth.Approximate cost of the additional thermal insulation strip for extrusion and conventional foam, respectively, 1,500 rubles and 500 rubles for the blind area of ​​one side of a country house.But better, of course, use the polyurethane foam.

So as you may have guessed, topsoil is removed by the width of the blind area, but farther away from the edges of the resulting recesses are starting to dig a ditch depth of about half a meter, with chamfers at 50-60 degrees.At the bottom of the ditch are placed strips of geotextile, pour a layer of coarse sand or fine gravel, it put a drain pipe, fall asleep its sand and wrap it all in geotextiles, bending the edges.Layers of sand and gravel for the blind area should go down the slope to the drain pipe, becoming a pillow for added insulation.When all is ready, and tamped, put insulating panels of foam or polystyrene foam sprayed on top for insulation from the ground soaks up rainfall can put geotextiles.The ditch is filled, along the edge of the blind area is laid drainage system to drain waste water and the operation is complete.Be sure to cover the polythene concrete, that it is not cracked in the first days of too rapid evaporation of moisture from it.