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RU-200 Roof Underlayment

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WaterBlock® RU-200 is a premium roofing underlayment that delivers exceptional long term weather barrier performance compared to both traditional asphalt felt products and other synthetic underlayments.

WaterBlock® Premium Woven Housewrap is Here! Tech Data sheets are now available. Learn more

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

 

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.