Insulated Cathedral Ceilings Are Divine

Attractive? Yes. Desirable? Yes. Energy-efficient? Hmmm. The spaciousness that gives cathedral and vaulted ceilings their character can lead to energy loss and inefficiency. To stop energy costs from going through the roof, cathedral and vaulted ceilings require high-performance insulation in a limited amount of space.

For divine – and long-lasting – cathedral or vaulted ceilings, be sure to include STYROFOAM™ Brand Extruded Polystyrene and Dow polyisocyanurate insulation products in your plans. And don’t forget to enhance installation with Dow sealant, adhesive and accessory products. Dow’s extensive offering of solutions is designed to minimize heat loss and moisture problems associated with cathedral and vaulted ceilings while improving energy efficiency.

U.S.

Project Specifications Recommended Dow Solution
  • Insulate exposed beams
  • Install insulation on top of exposed tongue and groove roof decking
  • Reduce heat loss
  • Control moisture problems
  • Square edges on all four sides
  • 3/4"-4" thicknesses
  • Two board size options
  • 25 psi
STYROFOAM™ Brand Square Edge Insulation
  • Slotted board edges accommodate nailing strip for ease of attachment
  • 2' x 8' boards
  • 1-1/2", 2.0" thicknesses
  • 15 psi
STYROFOAM™ Brand WALLMATE™ Insulation
Enhanced Installation
  • Insulate exposed gypsum board inside
  • Install insulation between gypsum board and wood framing
  • Reduce heat loss
  • Control moisture problems
  • Dow’s strongest XPS sheathing
  • Reinforced plastic film facers on both sides
  • Square edge
  • 1/2" thickness
  • 15 psi
STYROFOAM™ Brand DURAMATE™ Plus Insulation
  • Film facers on both sides
  • Square edge and tongue and groove options
  • 1/2" – 1" thicknesses
  • 15 psi
STYROFOAM™ Brand Residential Sheathing
STYROFOAM™ Brand Square Edge Insulation
  • Interlocking fit
  • 3/4"-2" thicknesses
  • Three board size options
  • 25 psi
STYROFOAM™ Brand Tongue and Groove Insulation
  • Three-ply poly/aluminum facers for exceptional strength and durability
  • 1/2"-1" thicknesses
  • Two board size options
  • 25 psi
Super TUFF-R™ Insulation
  • Glass-fiber-reinforced polyisocyanurate foam core for fire resistance
  • Aluminum foil facers
  • 1/2"-2" thicknesses
  • Three board size options
  • 25 psi
THERMAX™ Sheathing
  • Radiant barrier-quality aluminum foil facers
  • 1/2"-1" thicknesses
  • Two board size options
  • 25 psi
TUFF-R™ Insulation
Enhanced Installation
  • Protect against air infiltration throughout attic/ceiling
  • Seal out moisture, dust, smoke, outside noise and insects
  • Enhance insulation performance
  • Portable two-component polyurethane foam sealant
  • Chemically cured, high-yield polyurethane foam
  • One-step application
FROTH-PAK™ Foam Sealant
  • Seamless, monolithic barrier for protection against water and air
  • Insulation and air barrier in one
  • FM and UL approved system
  • Professional spray foam installation
  • Continuous insulation coverage
  • Expands to seal and insulation cavities, cracks and crevices, when properly applied
  • Will not compress, settle, shrink or sag
  • Adds strength and rigidity to the wall assembly(2)
STYROFOAM™ Brand SPF Insulation – RS

(1) Consult the label and Material Safety Data Sheet carefully before use.
(2) National Association of Home Builders, Testing and Adoption of Spray Polyurethane Insulation for Wood Frame Building Construction, May 25, 1992

Installation Instructions
Cathedral/Vaulted Ceilings - Installing STYROFOAM Square Edge, RS, Tongue & Groove, DURAMATE™ Plus, TUFF-R™, Super TUFF-R, or THERMAX
Cathedral/Vaulted Ceiling (Exposed Beams) – Installing STYROFOAM Square Edge and STYROFOAM WALLMATE
 

Canada

Project Specifications Recommended Dow Solution
  • Insulate exposed beams
  • Install insulation on top of exposed tongue and groove roof decking
  • Reduce heat loss
  • Control moisture problems
  • Choice of board thickness options
  • Butt edge and shiplap edge options
  • 2' x 8' (600 mm x 2400 mm) boards
STYROFOAM™ Brand CLADMATE™ Insulation
  • Convenient larger 4' x 9' (1200 mm x 2700 mm) boards
  • Shiplap edge
STYROFOAM™ Brand CLADMATE™ XL Insulation
  • 2' x 8' (600 mm x 2400 mm) boards
  • 1"-4" thicknesses
  • Butt edge and shiplap edge options
  • 30 psi (210 kPa)
STYROFOAM™ Brand SM Insulation
  • Slotted board edges accommodate nailing strip for ease of attachment
  • 2' x 8' (600 mm x 2400 mm) boards
  • 1.5"-2.4" (38 mm-60 mm) thicknesses
  • 16 psi (110 kPa)
STYROFOAM™ Brand WALLMATE™ Insulation
Enhanced Installation
  • Insulate exposed gypsum board inside
  • Install insulation between gypsum board and wood framing
  • Reduce heat loss
  • Control moisture problems
  • Choice of board thickness options
  • Butt edge and shiplap edge options
  • 2' x 8' (600 mm x 2400 mm) boards
STYROFOAM™ Brand CLADMATE™ Insulation
  • Convenient larger 4' x 9' (1200 mm x 2700 mm) boards
  • Shiplap edge
STYROFOAM™ Brand CLADMATE™ XL Insulation
  • 2' x 8' (600 mm x 2400 mm) boards
  • 1"-4" thicknesses
  • Butt edge and shiplap edge options
  • 30 psi (210 kPa)
STYROFOAM™ Brand SM Insulation
  • Slotted board edges accommodate nailing strip for ease of attachment
  • 2' x 8' (600 mm x 2400 mm) boards
  • 1.5"-2.4" (38 mm-60 mm) thicknesses
  • 16 psi (110 kPa)
STYROFOAM™ Brand WALLMATE™ Insulation
Enhanced Installation
  • Protect against air infiltration throughout attic/ceiling
  • Seal out moisture, dust, smoke, outside noise and insects
  • Enhance insulation performance
  • Portable two-component polyurethane foam sealant
  • Chemically cured, high-yield polyurethane foam
  • One-step application
FROTH-PAK™ Foam Sealant
 (1) Consult the label and Material Safety Data Sheet carefully before use.

Installation Instructions
Installing SM/CLADMATE/WALLMATE in Cathedral/Vaulted Ceiling (Gypsum Board Exposed Inside Ceiling w/STYROFOAM Between Gypsum and Wood Framing)
Installing SM/CLADMATE/WALLMATE in Cathedral/Vaulted Ceiling (Exposed Beams Inside Ceiling w/STYROFOAM on top of Exposed Tongue & Groove Decking)
 

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