CLT Floor Sound Control via Decoupled Mounts
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Solution Overview
Problem
Cross laminated timber (CLT) construction faces challenges in achieving acceptable acoustic performance, particularly in multi-family buildings where sound transmission between floors is difficult to reduce, often failing to meet building code requirements.
Innovation Solution
The method involves attaching energy transmission control mounts to the ceiling side of CLT panels using fasteners, followed by attaching furring channels to these mounts and a thinner CLT sheet to form an exposed ceiling layer, which decouples the structural CLT panel and reduces sound transmission without the need for additional ceiling treatments, allowing for the use of insulation to enhance soundproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If CLT construction is used, then weight is reduced and carbon footprint is lowered, but sound transmission control becomes difficult
Solution Approach 1:
The patent divides the floor assembly into multiple independent layers: structural CLT panels, acoustic insulation layers, and finished flooring layers. This segmentation allows each layer to perform its specific function - structural support, sound absorption, and aesthetic finish - thereby reducing sound transmission while maintaining the lightweight CLT construction benefits.
Solution Approach 2:
The patent introduces acoustic insulation materials as intermediary layers between structural CLT panels. These intermediary layers act as sound barriers that block sound transmission paths, resolving the contradiction between lightweight construction and sound control by adding acoustic mediation without significantly increasing structural weight.
2Object-affected harmful factors
If additional ceiling treatments are added to reduce sound transmission, then acoustic performance improves, but device complexity and construction cost increase
Solution Approach 1:
The patent combines multiple functions into integrated floor assembly layers. The acoustic insulation layers serve both as sound barriers and as part of the structural floor system, eliminating the need for separate ceiling treatments. This merging reduces device complexity while maintaining sound transmission control.
Solution Approach 2:
The patent designs floor assembly layers that perform multiple functions simultaneously. For example, the insulation layers provide both acoustic isolation and thermal insulation, while the finished flooring layers provide both aesthetic finish and additional sound absorption. This multi-functionality reduces the need for additional specialized treatments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces sound transmission while maintaining the aesthetic appearance of a solid CLT panel, eliminating the need for finishing the structural CLT panel sides and allowing for imperfections, thus meeting sound reduction requirements without visible layers or additional ceiling treatments.
Implementation Method 1
attaching a plurality of energy transmission control mounts to a ceiling side of one or more of the cross-laminated timber panels using fasteners
Data Source
AI summary
A method of reducing sound transmission in a building constructed using horizontal cross laminated timber (CLT) panels to provide a floor of the building and a floor assembly are described. In an implementation, the method includes: attaching a plurality of energy transmission control mounts to a ceiling side of one or more of the cross-laminated timber panels using fasteners; attaching a plurality of furring channels to the energy transmission control mounts; and attaching a cross laminated timber sheet to the plurality of furring channels to form an exposed ceiling layer.