Có bốn vấn đề chính: 1. Các con đường chính chầu là nhất quán từ tầng một phòng tầng khác, nếu subfloor là một lớp sợi hội đồng quản trị theo định hướng (OSB) hoặc gỗ dán trực tiếp gắn chặt vào đầu của joists sàn. | Page 33 of 103 Summary - Horizontal Flanking in Typical Apartment Constructions For the case of two apartments horizontally separated by a partition wall assembly the Apparent-STC between two rooms is systematically less than the STC for direct transmission through the separating wall. There are four main issues 1. The main flanking path is consistently from the floor of one room to the floor of the other if the subfloor is a layer of oriented strand board OSB or of plywood directly fastened to the top of the floor joists. 2. Reduction of Apparent-STC by flanking is mainly due to the continuity of floor components across the floor wall junction. 3. Changes in the orientation of the floor joists or the details of the floor wall junction can significantly alter the flanking transmission. 4. In the worst cases the flanking transmission can be much stronger than direct transmission through the nominally separating wall so that improvements to the separating wall and or sidewalls have negligible effect on the Apparent-STC. IRC RR-219 Guide for Sound Insulation in Wood Frame Construction March 2006 Page 34 of 103 Changes to Control Horizontal Flanking One apartment beside another Airborne Sound Source For the case of two apartments horizontally separated by a partition wall assembly horizontal transmission there are four key issues 1. The main horizontal flanking path is consistently from the floor of one room to the floor of the room beside if the basic floor surface is a layer of oriented strand board OSB or of plywood directly fastened to the top of the floor joists. 2. The only surfaces that can be modified to significantly reduce flanking transmission are the floors in the two rooms. 3. The incremental effect of adding a floor topping depends not just on the topping but also on the floor over which it is applied. In particular the improvement due to a topping may depend strongly on the orientation of the floor joists relative to the floor wall junction. 4. In some .
