The table of spanings of the frame of the frame house helps to choose the right section of the floor lag, which means to avoid problems in the gear, creak and vibration when walking. Our home-grown approach is to take more beams - it is not economically justified. The board is cheaper than a bar, especially a large cross section. Most often the length of the floors of the floors is within 3.5-4.5 meters and, by observing the correct cross section and step, you can install a reliable overlap.
Let me remind you that the lags of the floor are set with a certain step, a multiple of the long side of the black sheath plate, namely 305 mm, 407 mm, 488 mm and 610 mm for OSB plates / plywood measuring 2240 x 1220 mm.
For steps 305 mm (12 "OC)
For steps 407 mm (16 "OC)
For steps 488 mm (19.2 "OC)
For steps 610 mm (24 "OC)
Where did the data in these tables come from?
How to work with the tables and what is a living and non-residential load?
Residential is everything that is located and moves around the overlap space: people, items. Non-residential load is the weight of building elements. For example, the weight of the floor lag and black floor plates.
It depends on what will be located on top: double bed or ordinary chair. The finishing floor covering may be light laminate, and there may be a tie of a warm floor with a tile.
Usually for residential premises, the total load is in the range of 200-250 kg per sq.m. If you plan to install a cast-iron bath, then look at its weight and add a lot of water and your beloved in it.
What breed of wood are taken these values?
Since our markets do not have the quality system and accurate determination of the timber variety, then the tables indicate values \u200b\u200bfor ordinary spruce and pines II varieties in the North American classification.
The actual size of the cross section of boards in American tables is less than European, what to do?
It's true. If the Americans say that the board with a cross section of 2 "x 6", then this is not 50.8 mm x 152.4 mm. In fact, it is 38.1 mm x 139.7 mm. Reducing the section of the board occurs as a result of drying and planing. On our panels, forest-bodies and markets are also not a furniture store. Sellers state that the board with a cross section of 50 mm x 150 mm, but in fact it can be 40-50 mm x 135-150 mm.