Flat Roof Insulation

About Flat Roof Insulation

Atlas Molded Products' Flat Roof Insulation provides high long-term R-Values and saves labor installation time. Suitable for use with all roofing membrane materials, molded polystyrene roof insulation is compatible with loose-laid and attached single-ply membranes, conventional built-up roofing or modified bitumen systems.

Flat Roof Insulation is unfaced polustyrene and is suitable for use with loosely laid single-ply membranes. Flat Roof Insulation is also used with conventional BUR and mechanically or adhesively attached single-ply and modified bitumen membranes when field-applied cover boards are used. 

Foam-Control® PLUS+® Flat Roof Insulation

Foam-Control® PLUS+® is an architectural insulation product line with high compressive strength, stable R-value, and superior moisture resistance. Foam-Control PLUS+® is a premium grade insulation manufactured to provide architects, specifiers, distributors, and contractors all the features and benefits inherent in a high quality architectural insulation.

  • High compressive strength of 15, 25, 40 or 60 psi
  • High R-value that never changes and is stable over time
  • Closed cell insulation with superior moisture resistance
  • High drying potential to rapidly release absorbed moisture
  • Meets code requirements for direct-to-deck
  • No thermal barrier required (see ICC-ES ESR-1006 and UL ER11812-01)

Strength¹, psi


75º F

40º F

Plus+ 150 15 4.2 4.6
Plus+ 250 25 4.4 4.8
Plus+ 400 40 4.4 4.8
Plus+ 600 60 4.5 4.9
¹Compressive strength @10% deformation.
²R-Value and thicknesses to meet your needs.

Foam-Control® PLUS+® Flat Roof Insulation Outperforms XPS 
  • Foam-Control® PLUS+® provides more R-value at a lower cost
  • XPS use blowing agents that cause R-value loss over time
  • Foam-Control® PLUS+® available in 15, 25, 40, and 60 psi strengths at a lower cost
  • Foam-Control® PLUS+® has a superior drying potential
  • Foam-Control® PLUS+® is more vapor permeable to help avoid moisture problems

Foam-Control® Flat Roof Insulation

Foam-Control® Flat Roof Insulation is a cost-effective, durable and energy efficient solution for roof insulation. Foam-Control® Flat Roof Insulation is compatible with all major roofing materials and assemblies.

  • No long-term R-value loss or thermal drift
  • Design Flexibility
  • Moisture Resistant
  • Cost-Effective
  • No CFC, HCFC, HFC, or formaldehyde
  • No thermal barrier required (see ICC-ES ESR-1006 and UL ER11812-01)

Strength¹, psi


75º F

40º F

100 10 3.9 4.2
130 13 3.9 4.3
1 Compressive strength @ 10% deformation.
2 R-value units are °F·ft2·h/Btu.
3 Recommended for design in WARM climates.
4 Recommended for design in COLD climates.

Foam-Control® PLUS+® & Foam-Control® Flat Roof Insulation

Foam-Control® PLUS+® and Foam-Control® Flat Roof Insulation are recognized for use in direct-to-deck applications.  UL Evaluation Report ER11812-01 and UL Roof Deck Construction No. 458 recognize Foam-Control® PLUS+® 150 up to 6.7" and Foam‑Control® 100 up to 10” being installed directly over steel roof decks along with a Class A, B or C roof covering of 80 mils or less.

ICC-ES Evaluation Report ESR-1006 recognizes Foam-Control® PLUS+® 150 up to 6" and Foam-Control® 100 up to 9” to be applied directly over steel roof decks along with a Class A, B or C roof covering of 45 mils or less.

Manufacturing procedures for roof insulation that are identified in quality control manuals include: material tracing, in-plant testing of product, random sampling of product by outside independent laboratories and labeling of finished product for in-field identification.

Atlas Molded Products’ quality assurance program is the most comprehensive in the molded polystyrene roof insulation industry. It allows for complete code compliance, certification to critical physical properties and roof listings from UL, FM and others.

Atlas Molded Products' Flat roof insulation is recyclable and environmentally friendly. It contains no CFCs, HFCs, HCFCs or formaldehyde, and it comes with a 50-year thermal warranty.

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