Abstract: An acoustic door assembly having 1¾? thickness, a sound transmission class (STC) rating greater than 50, UL10C 20-minute fire rating, and constructed without sheet metal or lead. In an embodiment, the door assembly includes a frame housing a decoupled internal core sandwiched between two mass-loaded vinyl outer faces. The internal core includes a multi-layering of low-density layers for absorbing high-frequency noise, damping layers of mass-loaded vinyl for absorbing low-frequency noise, and a flame-retardant layer. The outer faces are a multi-layered assembly coupled to a frame of the door assembly and in contact communication to the internal core, the outer faces having layers of mass-loaded vinyl, plywood, high-density fiberboard, and a veneer.

Abstract: Systems and methods for providing a sink basin having a coupled drain assembly for interchangeably coupling a drain and a garbage disposal are described. In an aspect, a sink basin drain assembly includes, but is not limited to, a drain body defining an interior; a collar extending outwardly from the drain body and terminating at an exterior edge and tapering from the exterior edge to an aperture fluidically coupled with the interior, the exterior edge configured to couple with an inwardly extending interior lip on a bottom portion of a flanged drain housing, the collar including a collar seal configured to abut an upper surface of the; and a drain shield including a base and sidewalls extending upwardly from the base, the sidewalls configured to interface with the bottom portion of the flanged drain housing to push the lip against the collar seal.

Abstract: A laminated countertop assembly can include a first generally longitudinal slab with a first substrate, where the first substrate has lamination on a countertop side of the first substrate and lamination on an edge side of the first substrate that extends along a first portion of a length of the edge side of the first substrate. The first substrate can also include a first miter cut angled into the first substrate and slots extending into the first substrate for receiving biscuits. The laminated countertop assembly can also include a second generally longitudinal slab with a second substrate, where the second substrate has lamination on a countertop side of the second substrate and lamination on an edge side of the second substrate. The second substrate can also include a second miter cut at a corner of the second substrate and slots extending into the second substrate for receiving the biscuits.