Distance between floor lags

Lagas for the floor are called transverse crossbars, most often representing the segments of the bar fixed on the inter-storey overlap. Their cross section, the thickness of at least 3 times more than the same parameters of the flooring boards.

For example, the 12×12 cm bar is put on a perpendicular board 15×3.5 cm. In the article, we will consider what should be the distance between the lags of the floor.

What does the step depend?

The distance between the lags for the floor boards depends on the load on the collected overlap, the weight of the entire vehicle and the dimensions of the room, as well as the sections and boards, and the bar. Too small step Although it will give strength, it will be overwhelmed by the excessive weight of the structure or building, the plan will recalculate starting with the foundation before starting construction. Too big step – the boards will turn under the weight of people, furniture and technology, in the worst case the floor can crack and fall into either on the floor lying below, or to get in touch with the draft floor (foundation) of the construction, while disrupting the thermal insulation of the latter. In any case, when damaged boards, failure of people and items in the room will require a repair that includes an increase in the “lag” component.

Laying extra lag with a possible replacement of already existing, damaged inevitable. Similarly, the boards themselves will be replaced – those of them who managed to deform.

Features of calculation

Without going into formulas, laboratory recalculations and experiments an experienced installer, a carpenter, a master-stacker is immediately guided by the laws of physics and developed over the years of successful activities. After all, in front of him there is a challenge to make the house with “legalizing” (if it is a country, without the registration of the owner) had no complaints from the local representatives of government agencies and structures that would definitely hold a full fire and technical examination and cadastral legal support to issue a conclusion about the suitability of the house for year-round residence.

Explain this on a specific example. So, the house is built or reconstructed (the plan has changed). The owner can go in two ways: or “warming up” tiles on the ceramzitobetone, or build full-fledged wooden floors. In the second case, it will help, for example, such a mixture: boards with a cross section of 4 to 16 cm, lags with a cross section of 12 by 12 cm. For the floor of the first floor, as well as for basement rooms, where the barn floor (foundation) is already there, the thickness of lags does not play a noticeable role. Similarly for reinforced concrete inter-storey floors. You can, in general, do without lags, if not worth the task to make insulation between wood and reinforced concrete, for example, when a warming cable for warm floors.

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There is a universal recommendation that cannot be broken: The height of the board 2 cm will require a distance between the beams of 30 cm. For 2.5 cm of the same height, the gentle distance will increase to 4 dm; For 3 cm – 5 DM span, for 4 cm takes 6 dm. For 5 cm of the distance – already 1 m. Large distances between beams in private-country construction are not practiced. Calculation is made for empty rooms, but with a large load, these parameters are noticeably recalculated. Purpose – 3-4-fold stock for strength, only such a rule will ensure reliability and durability of overlaps.

For the arrangement of the floors previously used logs. It must be sharpened, diameter and calibrated: permanent diameter over the entire length, smoothness, excluding the deviation of the boards. Rustic requirements for brothers exclude oscillations of even the tipped flooring board.

Today, the log is actively displaced from the turnover – for lags, the timber is used more often.

Modern floor satisfies several requirements at once:

  • Ideal horizontal flooring;
  • Extension protection against foreign sounds;
  • ventilating (microcirculation) under the board facility;
  • Purpose space under the floor for supplying electricians, water supply;
  • Extension protection from cold in winter and from heat in summer;
  • The speed of dismantling old and installing new elements in their deformation.

Brous material will serve fir, pine or fir. Floor flooring in the bath will require a deciduous tree of wood – it is better to oppose the mooring and associated gradual destruction (rotting). Larch, although it is more expensive, will last longer. Lags – undemanding to high quality and perfect appearance material: they are hidden under the flooring after the installation of the flooring. The cross section of the brusade vehicle is chosen square or rectangular: in the last version of the beam thickness 1.5 times higher than its width. Bar does not “lies”, and stands on the edge.

For the beams, building materials of the 2nd and 3rd grades are taken, the water content by weight in the wood should not be more than 18-20%. Such wood belongs to the billets of natural humidity. The bar in the context is necessarily taken by rectangular, and not square, when it is placed between floors without reinforced concrete covering. Such a relationship in the section of the bar allows the owner to maximize the owner and residents of the structure, having achieved a high resistance to a possible deflection of high load.

If you try to present more clearly, as a decision made in practice, it turns out that the living room with heavy furniture and a rich interior is a span between lags, calculated by the previous scheme, should be 5-10 cm less than in the bedroom, where from heavy Objects only sleeping set and wardrobe. For the corridor, this indicator is less – even on the same value than for sleeping interior.

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Some country house owners are installed in the corridor a wardrobe and puffs, but this does not mean that the remaining load on the remaining busy square is the same: as a rule, there are little in the corridor from additional furniture items, as the corridor is a non-residential room. Consequently, the floor in the corridor does not require capital strengthening, as in residential rooms.

The size of the nestlable bar must never sit down. The cross section of the bar, on the contrary, is not fully taken into account. Nevertheless, the strength figures of the floor are crucial.

If strictly observe all the other values ​​of the characteristics (their sampling), then this violation will not significantly affect the durability of the floor.

Do not save on the cross section of the bar – its insufficient sample will seriously reduce the service life of the floor. Experienced installers take material with a margin of strength – it is better to overpay once not as much amount and make the “floor forever” than to change it, spending more money as a result. When calculating the thickness (height) of boards and bars, the thickness of the insulation layer is also taken into account.

Let’s give another example. The two-meter distance between the lags will require at least a ram in 11×6 cm. The three-meter spit will require 15×8 cm, four-meter – 18×10 cm. But such distances are used for the organization of well-maintained outlets: at 5 m, the timing of 20×15 cm. In private housing practice, such “gigantic” spans are not needed. In addition, it is no need to use different spans for the premises in the same country house: in height, the floor will be distinguished that it will create additional inconveniences.

How to mount?

The specialist uses construction calculators scripts, or, knowing the SNiP, calculates all the necessary parameters for sexual flooring and beams independently. Newbie, as a rule, uses security considerations: It can easily overstat the thickness of the boards by 1.5 times, inhabited the value of the span between the beams. By increasing the cost of installing the floor, the consumer will save significantly at its repair and maintenance: this “investment” will benefit here. This approach is often adhered to people who are in old age years old do not need hasty repair sessions, they want to live calmly and measured.

Before fastening the beams, they are displayed by level. Then, putting the segments of the bause “Naboka”, while the closest to the walls are laid at a distance of 10-30 cm. Further, sharing the remaining distance between them to the selected spoon, count their number. If the master did not fit into this size, and instead of the last two flights, let’s say, 50 cm, it turned out one in 90, it is better not to save and approximately in the middle to put a segment of a bar, “not fitted” in this gap.

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As a result, the last two beams fall into approximately the same compared to the rest of the spans. If you are faced with such a non-standard calculation plan, then before fixing the lags proportionately move them, the uniformity of the location is no less important: the centers of the mass design will not be shifted.

An example of calculation is specified as follows.

  • Premises length – 9 m.
  • Board thickness – 2.5 cm.
  • Distance between lags – 22.35 cm.

This distance is taken between the extreme faces of the neighboring bars, and not between their middle. For a board, for example, under 40 mm, a corresponding recalculation is made depending on the other characteristics of the room in the future. The minimum allowable distance between the lags is not defined – the decrease in the value of this parameter, in general, not critical. The garage is suitable thumb.

However, be sure to drive, put the car on the wooden floor you can not: It is mounted at a level of several centimeters lower than the lower edges and edges of the opening doors of the car. It is necessary to eliminate the random hit by wheel wheels on such a floor.

But laying the wooden floor, for example, on the balcony is subject to general rules, just for the rooms – it is important only that the balcony stove itself and the support under it have withstood the load (the maximum limit is considered to be lower than the standards for small and multi-storey houses).

Chipboard for flooring is not recommended – natural wood is much stronger than glued and compressed sawdust. In addition, the savings of manufacturers on the quality of glue and at all translated the chipboard and the OSB into low-term, low-load building materials. It is used only in those places where there is no additional load (walls and partitions, ceiling). However, for beams on the foundation or reinforced concrete overlap, you can use a glue bar. The use of polycarbonate, in general, not justified for floors: its strength is too low, and it is more expensive. Polycarbonate is suitable only for insulation (for example, cellular), or, let’s say, for the roofs of the arbors, but not for the floor.

Minor errors in the calculations will not reduce the strength of the floor. If you do not want to recount once again, then purchase a timber with a margin. Being more “often” laid, it will only create the basis for additional reliability, but the installed floor with timely staining, grinding from old layers of paint and additional primer before subsequent color sessions will serve you for a long time – all life.

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