\section{7.4 Properties of Materials}

\subsection{7.4.1 Quiet Barrier}
A flexible, 2 lb per sq./ft., 1/4 in. thick, high density material with a smooth surface designed to reduce noise transmission between two spaces. Applications include reducing airborne noise transmission through walls, ceilings and floors.

\begin{itemize}
\item High performance soundproofing material for reducing airborne noise.
\item May be used behind drywall in wall and ceiling assemblies or sandwiched between existing and new drywall.
\item Use in flooring systems to increase sound transmission class.
\item Only 1/4 in. thick yet weighs 2 lb./sq. ft. for maximum noise blocking.
\item Used for both residential and commercial soundproofing applications. (http://soundprooffoam.com/)
\end{itemize}

\subsection{7.4.2 Impact Barrier-plus-temp}
Premium grade carpet underlayment designed to reduce the transfer of sound from impact.

\begin{itemize}
\item Extremely effective in reducing impact sound.
\item Very effective in reducing airborne sound transmission.
\item Extra padding for additional acoustic performance and comfort.
\item Extends the life of your carpet.
\item Reusable under normal conditions \& traditional installation methods.
\item Engineered for plush carpets.
\item Made with approximately 60\% recycled materials.
\item 1/2 in. thick easy to cut and install.
\end{itemize}
(ibid)

\subsection{7.4.3 Pyramid-Family}
High performance, sound absorbing foam panel designed to reduce echo within an environment. Enhances sound quality and aesthetics of a recording or listening environment.

\begin{itemize}
\item Excellent echo reduction.
\item 3D pyramid pattern adds architectural interest.
\item Variety of colors, see color options.
\item Light weight, open cell polyurethane foam.
\item Easy to cut and install, see installation method.
\item UL94 HF-1 flammability rating.
\end{itemize}
(ibid)

\subsection{7.4.4 Quiet Batt Fibercraft}
A premium high-performance acoustical / thermal insulation manufactured from 80\% recycled cotton fibers. Quiet batt offers superior noise reduction versus typical fiberglass, cellulose and foam insulations.

\begin{itemize}
\item No itch, easy to handle friction-fit: easy to install.
\item Superior sound absorbing performance.
\item 80\% + recycled fiber content.
\item Available in 3-1/2 in. \& 5-1/2 in. thickness.
\item No harmful chemicals or worker discomfort.
\item Meets ``Green'' building requirements. (https://soundprooffoam.com/)
\end{itemize}

\subsection{7.4.5 Carpet}
\begin{itemize}
\item Highly durable construction.
\item Attractive finished appearance.
\item Perfect for increasing speech privacy.
\item Outstanding sound absorption performance.
\end{itemize}
(ibid)

\subsection{7.4.6 Tufcore Ceiling Tiles}
High-performance composite ceiling panel. Especially well-suited to minimize sound transmission between adjacent spaces sharing a common plenum or attic space.

\begin{itemize}
\item Dual function performance absorbs and blocks sound transmission.
\item Available in a variety of finish options and edge details.
\item Minimize sound transmission between adjacent spaces sharing a common plenum or attic space.
\item Gypsum improves sound blocking.
\item Fiberglass cores improves sound absorbing.
\end{itemize}
(ibid)