Synthetic Roof Underlayments

Defending Roofs Against Water, Weather, and Time.

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 & Custom Options

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.

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.

Standard Technical Specifications

Parameter
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

why Us?

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.

Installation Guide

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.