The span table of the frame house floors helps to choose the correct section of the floor lag, which means avoiding problems with floor sagging, creaking and vibration when walking. Our homegrown approach - to take more beams - is not economically justified. The board is cheaper than a bar, especially a large section. Most often, the length of the spans of the floors is in the range of 3.5-4.5 meters and, observing the correct section and step, you can install a reliable floor.
Let me remind you that the floor joists are set with a certain step, a multiple of the long side of the rough sheathing slab, namely 305 mm, 407 mm, 488 mm and 610 mm for osb / plywood board 2240 x 1220 mm in size.
For 305mm pitch (12" OC)
For 407mm pitch (16" OC)
For 488mm pitch (19.2" OC)
For 610 mm pitch (24" OC)
Where did the data in these tables come from?
How to work with tables correctly and what are residential and non-residential loads?
Residential is everything that is located and moves around the floor space: people, objects. Non-residential load is the weight of building elements. For example, the weight of the floor lag and subfloor slabs.
Depends on what will be located on top: a double bed or a regular chair. The final floor covering can be a light laminate, or it can be a warm floor screed with tiles.
Typically, 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 yourself in it.
What type of wood are these values taken for?
Since our markets do not have a quality system and an accurate determination of the grade of sawn timber, the tables show the values \u200b\u200bfor ordinary spruce and grade II pine according to the North American classification.
The actual dimensions of the section of the boards in the American tables are smaller than the European ones, what should I do?
It's true. If Americans say a board is 2" x 6", it's not 50.8mm x 152.4mm. In fact, it is 38.1 mm x 139.7 mm. The reduction in the cross section of the board occurs as a result of drying and planing. Our sawmills, lumberyards and markets also do not have a furniture store. Sellers claim that the board is 50 mm x 150 mm, but in fact it can be 40-50 mm x 135-150 mm.