Attic floor

To do this, pick up and stack girders, following a series of requirements. First of all beams must be of the dry wood, the best softwood (pine, fir, larch). In order for the beam does not bend, they are placed at 1 m from each other, and even closer.

The strongest bending beam with an aspect ratio of 7:5. Beam deflection depends mainly on the height, not the width, but too thin beam, it can bend to the side. In order for the load-deflection ceiling was flat, stacked beams in pre-selected camber.

The thickness of the beams to the attic floor should be not less than 1 / 24 of its length. For example, install a beam length of 5 meters, then its thickness should be 500:24 = 20.8 cm To do this, we can take a log diameter of 25 cm and a carved rectangular timber with aspect ratio of 7:5. Instead of lumber can take two boards total cross section equal to the estimated timber, and blend them in with nails staggered at 20 cm

With more frequent instead of laying the boards, you can use ordinary planks set on edge. For example, instead of the two beams cross 200X140 mm, laid in 1000 mm, we can use three boards section 200X70, stacked in 500 mm or four planks section 200X50 mm, arranged by 330 mm.

The ends of the beams attic floors of wooden buildings dovetail cut in the upper crowns of the entire thickness of the walls in stone - put on a wall or plant in a specially abandoned nests, in Samana, zemlebitnyh, etc. - put on a harness.