Quick Definition

Interior walls are the walls inside a home or building. They can be Free StandingA wall that is not dependent on other structures or walls. or Load-BearingWalls that carry the weight of the structure. They may support roofs, floors and interior walls.. Interior walls form the partitions that create rooms or spaces inside of a building. They can also help support the overall structure.

Media

In Depth

Interior walls may be constructed from a variety of materials and are assembled using multiple construction methodologies. Some types of interior walls used in residential designs are:

  • Wooden Stud – Wooden stud is the most common framed wall system and is constructed on site or in a factory (i.e. modular). It is comprised of several components:
    • A single 2x Sole PlateSole plate (also sill or bottom plate) is the horizontal 2x material at the bottom of a wall system that is fastened to the foundation.A sole plate holds the vertical studs in alignment and attaches them to the foundation. is attached to the sub-floor or foundation. Wooden studs are attached to the sole plate by Toe-NailingAn angled nailing method used to join two pieces of lumber that meet perpendicularly to each other..
    • Wooden 2x studs attached to the sole plate are spaced 16” on center (standard framing) or 24” on center (Advanced Framing).
    • On top of the studs, a double or single 2x Top PlateHorizontal 2x material at the top of a wall system that is fastened to the foundation. It holds the vertical studs in alignment and creates space for drop ceiling members or second floor joists to rest. connects the studs together.
    • The cavity of an interior wooden stud wall is not typically insulated, except when sound conduction or thermal concerns are present. When sound or temperature is an issue, stud wall cavities are typically insulated with Batt InsulationStrips of insulation, usually fiberglass, that fit between studs or other framing., Blown InAn insulation product composed of loose fibers or fiber pellets that are blown into wall cavities or attics using special pneumatic equipment. ., or Spray Foam.
    • Gypsum BoardA type of drywall made from a non-combustible gypsum core, held in place by a paper backing. is typically used to face both interior wall faces, but wood, metal or other finishes may be used.
  • Metal Stud – Metal stud interior walls use an extruded steel channel shaped stud in place of wooden studs. Metal stud interior walls use Metal Self Tapping ScrewsScrews with special tips that allow them to be screwed directly into metal without the need for pre-drilling.. The other components of metal stud wall assembly are similar to wooden stud walls.
  • Plywood or OSB SIP (see the MIR Insight on SIPs video) – Structural Insulated Panels (SIPs) are a high-performance building system used in residential and light commercial construction. SIPs are made of an insulating EPS foam core sandwiched between two structural facings, such as plywood or oriented strand board (OSB). SIPs are prefabricated and typically custom-made specifically for the design of your home. SIPs are not typically used for interior walls since interior walls do not require insulation or extra OSB. However, when an interior wall must be load-bearing, plywood or OSB SIPs can be used. The other components of plywood or OSB SIPs wall assembly are similar to wooden stud walls.
  • Metal SIPs – Metal SIPs are comprised of an insulating EPS foam core sandwiched between two structural facings made of metal. Metal SIPs are not typically used for interior walls, due to most interior walls not requiring insulation or the metal panels. However, when an interior wall must be load-bearing, metal SIPs can be used. The other components of metal SIPs wall assembly are similar to wooden stud walls.

Our Application

Make It Right has used wooden stud, steel stud and OSB SIPs as interior walls in our homes. Most of our interior walls are wooden stud with gypsum board on either side of the wall. Our interior walls are framed using Advanced Framing using 24” on center spacing. On two designs, interior load-bearing walls are OSBOriented Strand Board is an engineered wood product formed by layering strands (flakes) of wood in specific orientations. Has a rough and variegated surface with the individual strips (2.5 x 15 cm / 1 x 6 inch) lying unevenly across each other. SIPStructural Insulated Panels.s to help support roof structures.

Lessons Learned

Make It Right primarily uses SIPs for the exterior walls of our homes. We find it easier to run wiring and plumbing through the interior stud walls whenever possible, as SIPs solid foam core makes wiring and plumbing through the panels more difficult.

By utilizing Advanced Framing Techniques we use 20% less material than standard framing practices.