How to make a floor on a loggia (from OSB on joists)

I will show you how to make a loggia floor from OSB on joists. The floor on a loggia, or balcony, is laid in most cases on wooden logs made of timber. The height of the logs depends on the type and thickness of the insulation used, as well as on whether or not you will level the floor on the loggia (in some houses the floor has a slope towards the fence, ensuring rainwater drainage). First, it is necessary to waterproof the concrete floor slab using bitumen mastic, polyethylene or vapor barrier film; for better thermal insulation, foil insulation can be used.
If the floor is leveled horizontally, then the minimum permissible log height is 40 mm. The logs are set in increments of 500 mm and are leveled horizontally using wooden or plastic pads. Then, using anchors, they must be secured to the base. In dry rooms, logs do not need to be coated with antifungal and waterproofing compounds. Thermal insulation materials are used to insulate the floor. Sanded or construction plywood and OSB-3 oriented strand boards serve as the basis for further covering with laminate, linoleum, and carpet. The recommended OSB thickness is 15-20 mm. The sheets are attached end-to-end with the seams offset to the joists (the distance between the joists is 450 mm). The resulting gaps are sealed with silicone or acrylic sealants. Also, for better ventilation and the absence of squeaking, it is necessary to leave a deformation gap between the flooring (plywood) and the wall - at least 12 mm. Installing plywood with offset seams means: plywood sheets are laid so that there is no cross-joining between the sheets in the rows. When attaching moisture-resistant oriented strand boards OSB-3 (OSB) to joists, screws are placed every 15-30 cm in a checkerboard pattern relative to the fastening of the adjacent board. Screws are used for wood 4 centimeters long. When laying OSB, 9 mm thick, in two layers, the load-bearing, bottom layer is laid perpendicular to the joists, and the leveling, upper layer is laid perpendicular to the load-bearing layer. To avoid creaking of OSB-3 slabs or plywood sheets, the deformation gap between the slabs or sheets must be at least 3 mm. If insulation is laid on the concrete base of the floor to ensure sound insulation (for example, basalt mineral wool slabs), then for better floor ventilation between the flooring and leave a deformation gap of 5-10 mm with the wall. The resulting gaps along the walls are covered with plinths or wall covering panels.
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Video sections (chapters):
0:00 Introduction
0:25 Concrete floor on the balcony
0:35 Necessary tools and materials
1:00 Flooring project
1:27 Installation of joists on the floor
2:04 Waterproofing the floor
4:44 Floor insulation with foam plastic
6:10 Installation of OSB sheets on joists
8:39 Nuances of installing floors on the balcony
9:43 Conclusion
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And in this video I will show you how to make a plastic ceiling on a balcony • Потолок на балконе из ...
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