Preparing the foundation for a wooden floor
The technology of laying wooden floors involves several options for implementation, depending on the requirements for the final result, on the materials used and on the operating conditions of the floor. But, in any case, the starting point of all technological chains is a dry, non-deformable, even and smooth base on which the remaining layers of the floor “cake” fit. Most often, reinforced concrete floor slabs act as such a base, add layers of coating: • Reinforced concrete floor - cement leveling screed - waterproofing - black plywood floor - front wooden floor. • Reinforced concrete floor - cement leveling screed - waterproofing I - joists - vapor barrier foil - facial wooden floor • reinforced concrete floors -. the cement leveling screed - waterproofing - joists - vapor barrier - a subfloor of plywood - facial woodcover. However, the ideal basis at the disposal of builders or repairmen is not always. We are talking about houses in which the overlap is not solid, but made of metal structures, reinforced concrete or wooden beams. To the problem, in terms of repair, can also be attributed buildings with extremely uneven concrete base and collapsed cement screeds. Modern methods of correction, restoration and repair of the foundation with the use of new materials - special dry formulations, light concretes, leveling mixtures - allow these problems to be effectively addressed, while reducing the cost of construction and reducing its time. In the end, you can remove old cement or concrete screed and create a new one. But in this approach there is one serious drawback that does not correspond to the modern rhythm of life: a large initial moisture content in the concrete and a long pause for up to 3 months in the interior finishing work associated with the drying of the screed to an acceptable level of moisture content. This obstacle was learned to overcome by applying dry expanded screeds based on expanded clay, which have a number of advantages,absent from traditional cement-based ones: • Dry screeds are much lighter than cement screeds, their weight is not critical for wooden floors in old buildings. • Screeds based on expanded clay are perfect from an environmental point of view. • • Dry screeds are durable and do not shrink, as well as cement. • Due to the porous structure of the material, an expanded clay tie does not remove heat from the front layer of the floor and perfectly absorbs sound. • It is easy to “hide” communications in the thickness of the expanded clay — pipes and cables. continuous until complete completion of work. For the device of a dry screed, expanded clay is usually used, porous and from which light granules are obtained from baked clay. Expanded clay differ in size and shape of the granules. For dry screeds of small thickness, expanded clay sand with particles 1–6 mm in size in diameter is used. Different diameter of the granules ensures their tight installation with small air gaps. Such a screed does not shrink over time. Consider the stages of flooring with a dry screed device details: 1. The creaking of old floors indicates wear below the layers of the coating. To get to them, dismantle the upper face layer, then the black floor and the waterproof layer under it.Next, remove the logs and vapor barrier layer. The old screed is destroyed with the help of a powerful perforator working in percussion mode with a special nozzle. 2. Temporarily dismantling wooden slats or metal profile, which served to level the old screed on a cement base. Thoroughly removed debris to obtain a clean surface of the slab.3. When moisture gets on the expanded clay screed, its properties will change - the granules will begin to stick together and the screed will shrink. As a result, the elements above the located elements of the floor under the load will begin to move relative to each other - the floors will begin to creak.In order to prevent contact of the dry screed material with moisture, rising from the bottom in the form of water vapor, a vapor barrier layer is laid under it. It can be made of dense polyethylene film, glassine, special steam and moisture insulating materials. Stripes of film with a five-centimeter overlap spread over the entire area of the room, curving against the walls.4. On the perimeter of the room, using a double-sided paint tape, the edge band is made of foamed polyethylene, which serves to fix the thermal expansion joint and absorb shock noise (the sound of footsteps will be concealed and not transferred to neighboring rooms). 5.The upper edge of the bulk dry screed should be absolutely flat in all directions. Therefore, it is necessary to preset and fix the level guides in the form of strips of metal profile, which will also perform some reinforcement function in the screed, over the entire area of the room. This is the most complex and responsible operation when constructing a dry screed, which determines the final quality of the whole work. When you perform it, use a flat bar with the level set on it. Laser construction can be very useful. 6. You can fill the material of the screed, distributing it evenly, aligning its level along the guides. As you align the tie, it is useful to slightly compact it, pressing it down, for example, by trimming the board. To obtain a high-quality screed, the amount of expanded clay sand must be such that a layer of at least 2 cm in height is obtained. Accordingly, the necessary geometric parameters must be satisfied and the guides set earlier. If necessary, move along the screed, so as not to spoil the work - because the legs will sink into soft and supple material - you need to move along the plywood ladders orsheets from gipsovolokna. The following stages of the floor installation on a dry screed are significantly different from the technology with a cement-based screed. The traditional are the steps when lags are installed over the tie in order to create a ventilated gap, laying between lags of heat-insulating and sound-absorbing material or raising the floor level. Waterproofing is applied to the logs, so that moisture does not penetrate to the heater from above. All this is covered with a black floor, on which the face material is laid.
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