STC Wall & Floor Configurations

Cellulose Insulation is an excellent sound proofing insulation product for homes and all types of buildings

Below are a few of the many different possible wall, floor and ceiling construction options. Each wall, floor or ceiling assembly has a different performance for Thermal (R value), Sound (STC) and Fire Resistance. You will find following a few sample construction assemblies, many other options are also possible. Please contact our technical desk for additional information on the thermal, sound or fire performance possibilities that can be designed using our products.

  • Exterior Walls
  • Floors
  • Interior Walls

Exterior Wall

EW1a – Exterior Wall Wood Stud

  • 2×4 wood studs spaced 16” or 24” o.c.
  • 3.5” thick Weathershield/Weathershield / ProCell TM cellulose insulation (wet-spray or dense pack)
  • 1 layer 5/8” Type X drywall
  • Exterior sheathing and siding
  • FRR – 1 hour
  • STC – n/a

Floors

 

F3b – Wood Floor Joists

  • Subfloor of 5/8” plywood, OSB or waferboard
  • Wood Joists or Wood I-Joists spaced no more than 24” o.c.
  • With cellulose insulation in cavity
    • 150 mm thick loose fill Weathershield / Weathershield / ProCell TM cellulose insulation
    • 90 mm thick wet-spray Weathershield / Weathershield / ProCell TM cellulose
    • Add 1 STC per 50 mm thickness increase in insulation depth up to max of joist depth
    • 1 layer 5/8” Type X drywall in cavity
    • FRR – n/a
    • STC – 31

 

F20f – Wood Floor Joists with concrete topping

  • 1.5” concrete topping
  • Subfloor of 5/8” plywood, OSB, or waferboard
  • Wood Joists or Wood I-Joists spaced 16” o.c.
  • With Weathershield / Weathershield / ProCell TM cellulose insulation filling the cavity with a density of 2.5 lb/ft3 that is supported by zinc-coated galvanized poultry fence fabric having 1” hexagonal openings and made using 20 gauge wire
  • Resilient Channel spaced 300mm o.c.
  • 1 layer 5/8” Type X drywall
  • FRR – 1 hour
  • STC – 65

Interior Walls

S6a – Steel wall studs

  • 1.5” x 3.5” steel studs spaced 24” o.c.
  • With 3.5” thick Weathershield / Weathershield / ProCell TM cellulose insulation
  • 2 layers 5/8” Type X drywall both sides
  • FRR (non-loadbearing) – 2hours
  • STC – 56

S11a – Steel Wall Studs

  • 1.5” x 5.5” loadbearing steel studs spaced 16” or 24” o.c.
  • With 3.5” thick Weathershield / Weathershield / ProCell TM cellulose insulation
  • Resilent channel spaced at 24” o.c.
  • 1 layer 5/8” Type X drywall on each side
  • FRR – n/a
  • STC – 50

S15c – Staggered Steel Stud Wall

  • 2 rows of 2×4 steel studs spaced 16” or 24” o.c. on 2×6 base plate
  • With 3.5” Weathershield / Weathershield / ProCell TM cellulose insulation
  • With 2 layers 5/8” Type X drywall on each side
  • FRR (Loadbearing) – 1 hour
  • STC – 68

W15a (Sample 1) – Double Wood Stud Wall

  • 2 rows 2×4 spaced 16” or 24” o.c. on separate 2×4 base plates that are spaced 1” apart.
  • With 3.5” Weathershield / Weathershield / ProCell TM insulation in each cavity
  • 2 layers 5/8” Type X drywall on each side
  • FRR (loadbearing) 1.5 hours
  • FRR (non-loadbearing) 2 hours
  • STC – 66

W3b – Wood Wall Studs

  • 2×4 wood studs spaced 24” o.c.
  • 3.5” Weathershield / Weathershield / ProCell TM cellulose insulation
  • Resilient channel spaced 16” or 24” o.c.
  • 1 layer 5/8” Type X drywall each side
  • FRR (loadbearing) – 45 min
  • FRR (non-loadbearing) – 1 hour
  • STC – 48

W7a – 2 row staggered wood stud wall

  • 2 row of 2×4 spaced `16” or 24” o.c. on 2×6 base plate
  • Fill cavity with Weathershield / Weathershield / ProCell TM cellulose insulation
  • 1 layer 5/8” Type X drywall each side
  • FRR (loadbearing) – 1 hour
  • FRR (non-loadbearing) – 1 hour
  • STC – 47

W10a – 2 row staggered wood stud wall

  • 2 rows of 2×4 wood studs spaced 16” or 24” o.c. on common 2×6 base plate
  • Fill cavity with Weathershield / Weathershield / ProCell TM cellulose insulation
  • Resilient channel on one side 16” or 24” o.c.
  • 2 layers 5/8” Type X drywall each side
  • FRR (loadbearing) – 1.5 hour
  • FRR (non-loadbearing) – 2 hour
  • STC – 62

S1a (wall 2) – Steel stud wall

  • 2×3 steel stud spaced 24” o.c.
  • Cavity filled with Weathershield / Weathershield / ProCell TM cellulose insulation
  • 1 layer 5/8” Type X drywall each side
  • FRR (non-loadbearing) – 45 min
  • STC – 43


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