The rafters of the attic - provide reliable room roof

rafters of the attic - what features we should expect?

Looking at the roof terrace, it is difficult to imagine the true complexity of the system design sloping beams that support its outer cover, the whole complex of waterproofing measures parozaschity and insulation for the sustenance of the attic space.High attic space is usually used as a dwelling called the loft.

mansard roof rafters should be interconnected, or be cut into mauerlat puff vrublennye have auxiliary elements (beams, Grandma, braces and supports), additional mounting bolts, clamps or clips.Choices for these bindings depend on the characteristics of the prevailing load: tensile, compression or bending.

main active forces directed to the carcass structure of the roof, caused by the weight of the rafters themselves fixed on their crates, snow masses, wind and other loads.It factors in bending deformation (including mounting legs farms), and therefore subject to additional beams, reinforcements mentioned above, struts, etc.elements.

Focusing on the design elements of size, other factors need to spend at least an elementary calculation of the attic rafters.It is important not only to choose the right cross-section of them, but taking into account the size of the fragment overhangs and method of attachment, support and fastening each element providing the necessary rigidity of the entire roof of the skeleton.

calculation is carried out of the allowable deflection by the total length (less than 1/250 part of the given load of 100 kg per square meter of roof).

When large overlapped area is important to correctly position the mauerlat (waterproofing), preventing a possible deflection of the entire roof (set indented from the edge of the wall and the use of special plank "fillies").It is equally important to calculate and mount the whole of this design to the walls of the building shell.Apply through one leg clamps special reinforced steel wire or rope, clamps, etc.

mansard roof rafters -. Building construction

As is well known, distinguished naslonnye and hanging types of trusses.These can be simple and complicated designs and are used in the case of overlapping large spans.Mansard roof rafters are such a complex type.Given the residential nature of the attic space mansard roof, the whole area of ​​the structure between the farms need to lay insulation with waterproofing.

Top layer material necessarily performed paroizolyatora with transverse stacking sheets from the eaves upwards, and providing them with the following lap belt is not less than ten centimeters.As the material is sewn crate, provide ventilation between the roof and the insulating gasket.The design of the attic truss girders are used to relying on the rack, transmit the weight load on the supporting wall.

Special struts and bolsters are used for heavy roofs, increasing the distance between the posts, etc.It is also desirable to provide wind ligament between runs.When the device roofs of adjacent buildings and their annexes truss structures must not cut the key.

from acting on the roof of the forces depends on how connected to the rafters of the attic with his own hands.leg supports on mauerlat times are usually provided with special pockets and studs.It allowed the practice of using mauerlatov of the individual connected to each other, the boards.For greater reliability, a fastening bolt carried appropriate length and diameter.

When the rafters of the wood material is taken only the highest grade, knotty or without other defects.As already stated, the section is selected based on the length of the beam, the step between farms, the masses of roofing material, design loads per square meter roof.The condition of selection is allowable deflection at 1/250 of its length.

In the case of smaller section material providing rigidity and strength is achieved by using additional log struts of at least fifteen centimeters thickness.In this case, it makes sense to reduce the spacing between the beams feet, use mauerlat material is thinner than eighteen centimeters.

Installing rafters in the attic - how not to confuse the sequence of actions?

Installing attic rafters to conducted strictly on one horizontal, with equal leg lengths, hewn from the upper side.Performing the task is facilitated using a common template prepared in advance by the required shape and size.Work carried out on flat ground, the dimensions of boards, beams or beams should overlap required length to account for possible errors in the connection.

Initially established extreme farm.According stretched cord or temporary board made assembly and installation of the intermediate with their exact alignment.Held fit the protruding ends on the cord or the board.If the roof structure provided Plait adornments farm (usually hipped slopes) perform its polunogami (narozhnikami) to the main rafters.

Frames feet in mauerlat, all the responsible compounds of elements of beams, columns, girders and the like. D. Further strengthened reinforced braces, brackets and galvanized steel clamps.Their fixation is performed on the screws.It should do crate.

for crates of wood material used is not lower than second class, also without knots and boards.This may be a board, bar, poles or planks.Stacking crates also depends on the roofing materials and performed close or sparsely, with adequate ventilation between the insulation and the roof.