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Advantage-30 Synthetic Roof Underlayment

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WaterBlock Advantage-30 is designed and manufactured to provide a superior roofing underlayment compared to both asphalt felt products and other synthetic underlayments.

Installation Guides

The WaterBlock Installation Guides will guide you step by step how to install your Window & Door flashing.

  1. General Installation Guide
  2. Create Custom Installation
  3. Recessed Install Guide

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Installation Step 1

Download the printable version (PDF) of these instructions by clicking here

Install per diagram following steps A, B, C, D installing either WaterBlock (NOF) Nail on Flashing 9", 12" or 18", or WaterBlock 25 or 40 mil (WFM) Waterproof Flashing Membrane 9", 12" or 18".

Do not adhere or fasten along bottom edge.  LEAVE LOOSE until weather resistaive barrier has been installed or slipped up underneath the flashing in weatherboard fashion.