Synthetic Roof Underlayments - Shish SmartBuild

Defending Roofs Against Water, Weather, and Time.

  • Durable, water-resistant layer beneath roofing materials
  • Enhances roof life by preventing moisture infiltration
  • Lightweight, easy to install, and tear-resistant

SmartBuild™ Synthetic Roof Underlayments are a complete family of high-performance roofing base sheets engineered with multi-layer polyolefin construction, designed to deliver superior waterproofing, UV protection, tear strength, and installation safety across residential and commercial roofing systems.

Manufactured by Shish Industries Limited — an Intertek Certified Roofing Manufacturer and Miami-Dade County Registered Facility — SmartBuild™ underlayments are trusted across North America under both the SmartBuild™ brand and private label programs.

✅ ASTM D226, ASTM D4869, ASTM E108 Class A compliant
✅ Miami-Dade County Registered
✅ Private Label Customization Available

At SmartBuild™,
we manufacture reliability, performance, and confidence into every roll.

Key Features

Waterproof Secondary Roofing Barrier

Shields roofing decks from water infiltration under shingles, metal, or tile.

Slip-Resistant Surface

Textured upper surface provides safer footing for installers.

UV-Resistant Construction

Built-in stabilizers for extended sunlight exposure without degradation.

High Tear and Nail Puncture Resistance

Woven core reinforcement withstands job site rigors.

Lightweight and Flexible

Easier handling, faster installation, fewer seams.

Class A Fire Resistance

ASTM E108 certified across Silver, Gold, Platinum, and Daimond.

Roof Underlayment Product Range

SmartBuild™ Silver

Entry-grade synthetic underlayment for residential shingle and basic metal roofing systems.

  • Basis Weight: 90 GSM
  • UV Resistance: 30–60 days
  • Fire Rating: Class A
  • Lightweight and economical

SmartBuild™ Gold

Mid-grade synthetic underlayment providing enhanced durability and slip resistance.

  • Basis Weight: 110 GSM
  • UV Resistance: 90–120 days
  • Fire Rating: Class A
  • For general residential and light commercial roofing.

SmartBuild™ Platinum

High-strength underlayment offering extended UV protection and mechanical performance.

  • Basis Weight: 140 GSM
  • UV Resistance: Up to 150 days
  • Fire Rating: Class A
  • Suitable for high-end residential and commercial applications.

SmartBuild™ Daimond

Heavy-duty synthetic underlayment designed for maximum roofing protection and extended service life.

  • Basis Weight: 160 GSM
  • UV Resistance: 180 days
  • Fire Rating: Class A
  • Ideal for steep slope metal, tile, and high-value roofing systems.

Technical Specifications

Property
Silver
Gold
Platinum
Daimond
Thickness
~6.5 mil
~7 mil
~12 mil
~14 mil
Basis Weight
~2.65 oz/yd² ±5% (~90 GSM)
~3.25 oz/yd² ±5% (~110 GSM)
~4.13 oz/yd² ±5% (~140 GSM)
~4.72 oz/yd² ±5% (~160 GSM)
Roll Size
4 ft × 250 ft
4 ft × 250 ft
4 ft × 250 ft
4 ft × 250 ft
Coverage per Roll
~937 sq. ft (nominal)
~937 sq. ft (nominal)
~937 sq. ft (nominal)
~937 sq. ft (nominal)
Surface Type
Non-woven, slip-resistant grey
Non-woven, slip-resistant grey
Slip-resistant non-woven grey
Non-woven, slip-resistant grey
Vapor Permeability
Zero – non-perforated
Zero – non-perforated
Zero – non-perforated
Zero – non-perforated
UV Exposure Rating
Up to 90 days
Up to 180 days
Up to 180 days
Up to 365 days
Fire Rating
ASTM E108 Class A
ASTM E108 Class A
ASTM E108 Class A
ASTM E108 Class A
Toxicity
VOC-free, non-toxic
Non-toxic, VOC-free
VOC-free, non-toxic
VOC-free, non-toxic

Installation Guide

Installation Steps

  • Install grey printed side facing upward.
  • Use approved cap nails, staples, or roofing fasteners.
  • Overlap horizontal seams by 4 inches and vertical seams by 6 inches.
  • Start installation from the eaves upward to ridge.
  • Clean and dry roof deck prior to application.
  • Install final roof covering within 90 days of underlayment exposure.

Installer Safety:

  • Follow all OSHA-compliant fall protection and rooftop safety practices.
  • Wear proper roofing footwear with slip resistance.
  • Avoid installation during wet, icy, or high-wind conditions.

Why SmartBuild™ Underlayments?

Manufacturer Direct Control

From extrusion to lamination to roll winding — full production in-house.

Installer-Focused Engineering

Safer grip, efficient overlaps, consistent quality across rolls.

Code Ready

Built to meet ASTM, ICC-ES, Energy Codes, and Miami-Dade County standards.

Proven Durability Across USA

Installed and tested in extreme coastal, desert, mountain, and humid climates.