Product Data Sheet Safety Data Sheet Show all documents
Sarnatherm® ISO tapered

Sarnatherm® ISO tapered

Sarnatherm ISO is a rigid closed cell polyisocyanurate insulation board

Sarnatherm® ISO tapered is a sloped rigid closed cell polyisocyanurate insulation board with fiber reinforced felt facers. Sarnatherm Tapered is designed to achieve positive drainage, prevent ponding water, and is suitable for use in new construction and re‐roofing with Sarnafil® or Sikaplan® membranes.

  • Factory tapered panels
  • Manufactured with no CFCs or HCFCs
  • Virtually no GWP (global warming potential)
  • Zero ODP (ozone depletion potential)
  • Compatible with Sarnafil and Sikaplan membranes
Product Data Sheet Safety Data Sheet Show all documents

Usage

Wherever insulation is required within a conventional roof assembly to achieve sloped drainage requirements.    Areas of Application
  • New Roofs
  • Recover Roofs
  • Mechanically Attached Systems
  • Adhered Systems
 

Advantages

  • Factory tapered panels
  • Manufactured with no CFCs or HCFCs
  • Virtually no GWP (global warming potential)
  • Zero ODP (ozone depletion potential)
  • Compatible with Sarnafil and Sikaplan membranes

Packaging

  • 4 ft x 4 ft (1.2 m x 1.2 m)
  • 1/16" (2 mm), 1/8" (3 mm), 3/16" (5 mm), 1/4" (6 mm), 3/8" (10 mm), 1/2" (12 mm) per foot slopes available.

Color

Off‐white core with black facers

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • ASTM C 1289 Type II, Class 1, Grade 2 (20 psi)
  • ASTM C 1289 Type II, Class 1, Grade 3 (25 psi)
  • UL 1256, 790, 263
  • FM 4450, 4470
  • Miami‐Dade County
  • State of Florida
 
Product Information

Chemical Base

Polyisocyanurate foam core with fiber reinforced felt facers

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.

Thickness

Average LTTR Value*ThicknessSlope
4.30.5 – 1.0" (12 – 25 mm)1/8" per ft (1 %)
7.11.0 – 1.5" (25 – 38 mm)1/8" per ft (1 %)
10.01.5 – 2.0" (39 – 50 mm)1/8" per ft (1 %)
12.92.0 – 2.5" (50 – 63 mm)1/8" per ft (1 %)
5.70.5 – 1.5" (12 – 38 mm)1/4" per ft (2 %)
11.41.5 – 2.5" (38 – 63 mm)1/4" per ft (2 %)
8.60.5 – 2.5" (12 – 63 mm)1/2" per ft (4 %)

*LTTR (long term thermal resistance) values are based on ASTM C 1289. Test samples were third‐party selected and tested by an accredited material testing laboratory. The LTTR results were reviewed by FM Global and certified by the PIMA Quality Mark Program.
System information

System Structure

Sarnatherm Tapered is installed by a Sika Authorized Applicator. Sarnatherm Tapered may be installed by mechanical attachment to the roof deck with Sarnafasteners and Sarnaplates, by attachment with Sarnacol board adhesive, or by hot asphalt depending on project requirements and specifications. Roof insulation which has become wet or damaged should be removed and replaced with solid, dry insulation. Contact Sika Corporation – Roofing Technical Department regarding alternative methods of attachment.

 

Technical Information

Compressive Strength

20 psi (138 kPa)

25 psi (172 kPa)

(ASTM D-1621)

Dimensional Stability

< 2 %

(ASTM D-2126)

Reaction to Fire

Flame Spread: 25 – 60*

Smoke Development: 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.

Permeability to Water Vapor

< 1.5 perm (85.5 ng/(Pa∙s∙m2))

(ASTM E-96)

Water Absorption

< 1.5 %

(ASTM C-209)

Service Temperature

‐100 - 250°F (‐73 - 121°C)

Application

Application steps

APPLICATION INSTRUCTIONS

Sarnatherm Tapered is installed by a Sika Authorized Applicator. Sarnatherm Tapered may be installed by mechanical attachment to the roof deck with Sarnafasteners and Sarnaplates, by attachment with Sarnacol board adhesive, or by hot asphalt depending on project requirements and specifications. Roof insulation which has become wet or damaged should be removed and replaced with solid, dry insulation. Contact Sika Corporation – Roofing Technical Department regarding alternative methods of attachment.

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