Product Data Sheet Safety Data Sheet Show all documents
Sarnatherm® Roof Board A-III

Sarnatherm® Roof Board A-III

Sarnatherm Roof Board A‐III is a high‐density polyisocyanurate roof board

Sarnatherm® Roof Board A-III is a lightweight, high‐density polyisocyanurate roof board with coated glass facers. Sarnatherm® Roof Board A-III is suitable for use in new construction and recover roof applications with Sarnafil® or Sikaplan® roof membranes. The coated glass facers provide strong, smooth surfaces suitable for mechanically attached or adhered applications.

  • Lightweight for easy hoisting, staging and maneuvering
  • High impact and flexural strength
  • Easy scoring, cutting and snapping
  • Improved coverage rates in adhered systems
  • Manufactured using CFC‐, HCFC‐ and HFC‐free foam blowing technology
  • Virtually no Global Warming Potential (GWP)
  • Zero Ozone Depletion Potential (ODP)
  • Recognized as resistant or highly resistant to mold growth
Product Data Sheet Safety Data Sheet Show all documents

Usage

Used as a lightweight roof board in conventional roof assemblies    AREAS OF APPLICATION
  • New Roofs
  • Recover Roofs
  • Mechanically Attached Systems
  • Adhered Systems
 

Advantages

  • Lightweight for easy hoisting, staging and maneuvering
  • High impact and flexural strength
  • Easy scoring, cutting and snapping
  • Improved coverage rates in adhered systems
  • Manufactured using CFC‐, HCFC‐ and HFC‐free foam blowing technology
  • Virtually no Global Warming Potential (GWP)
  • Zero Ozone Depletion Potential (ODP)
  • Recognized as resistant or highly resistant to mold growth

Packaging

  • 4 ft x 4 ft (1.2 m x 1.2 m), 8 lbs (3.6 kg)
  • 4 ft x 8 ft (1.2 m x 2.4 m), 16 lbs (7.2 kg)
  • 0.5" (12.7 mm) thickness, 42 boards per pallet

Colour

Off‐white core with off white/light tan facers

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • ASTM C1289, Type II, Class 4, Grade 1
  • FM 4450 / 4470
  • FM 4473 hail rating SH‐1
  • UL Classified 790
  • UL Certified for Canada

 
Product Information

Chemical Base

Polyisocyanurate foam core with coated glass facers

Recycled Content

7.4% Pre-consumer

Shelf Life

N/A

Storage Conditions

Factory‐applied packaging is intended only for protection during transit. When stored outdoors or on the job site, the insulation should be stacked on pallets at least 4" (102 mm) above ground level and completely covered with a weatherproof covering such as a tarpaulin. The temporary factory‐applied packaging should be slit or removed to prevent accumulation of condensation. Refer to PIMA Technical Bulletin #109: Storage and Handling Recommendations for Polyiso Roof Insulation.
Technical Information

Compressive Strength

80 psi (551 kPa) minimum

(ASTM D-1621)

Flexural Strength

> 2000 psf (> 95 kPa)

(ASTM D-1623)

Dimensional Stability

< 0.5%

(ASTM D-2126)

Reaction to Fire

Flame Spread1: 40 – 60*

Smoke Development1: 50 – 170*

(ASTM E-84)

*Numerical ratings are not intended to reflect performance under actual fire conditions. Flame spread index of ≤75 and smoke development ≤450 meet code requirements for foam plastic roof insulation. Codes exempt foam plastic insulation when used in FM 4450 or UL 1256.

Thermal resistance

2.5

(ASTM C-518)

Permeability to Water Vapor

1.5 perm (85 ng/(pa s m))

(ASTM E-96)

Water Absorption

<3%

(ASTM C-209)

Microbiological Resistance

Resistant

(UL 2824)

Service Temperature

-100 – 250°F (-73 – 121°C)

Application

Application steps

APPLICATION INSTRUCTIONS

Sarnatherm® Roof Board A-III is installed by a Sika Authorized Applicator. Sarnatherm® Roof Board A-III may be installed by mechanical attachment to the roof deck with approved fasteners and insulation plates or by attachment with Sarnacol board adhesive depending on project requirements and specifications. Roof boards that have become wet or damaged should be removed and replaced with solid, dry roof boards. Contact Sika Corporation – Roofing Technical Department regarding alternative methods of attachment.

 

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