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Part 1: Prepare a Rough Opening for a Nail-Fin Window over Housewrap

This article outlines the initial steps involved in preparing a rough opening for a nail-fin window installation when housewrap serves as the water-resistive barrier (WRB). The process begins with carefully cutting the window opening in the housewrap, using a specific technique known as the I-cut method. This method involves making horizontal cuts at the top and bottom of the intended opening, followed by a vertical cut down the middle. This approach ensures that the housewrap extends slightly into the rough opening but does not reach the innermost edge, allowing the window to be installed directly to the rough opening for a continuous barrier, rather than relying on the housewrap for structural support. A critical aspect of this preparation involves the creation of a positive-slope sill to effectively direct water away from the house. While flexible flashing tape is gaining popularity, the article focuses on the common practice of using straight tape with housewrap. A potential challenge with straight tape lies in adequately sealing the corners, which can leave small pinhole gaps. To address this, a specific technique is described: cutting a piece of tape into a bowtie shape with two triangular cuts on opposite sides. The center of this bowtie-shaped tape is then pressed securely into the corner to eliminate any gaps and ensure a watertight seal. Following the corner flashing, an additional layer of tape is applied over sloped cedar siding. This combination is crucial for establishing the positive slope necessary for proper water drainage. The cedar siding itself serves a dual purpose, as two more pieces are strategically placed to provide a stable and level base for the window to rest upon. This meticulous preparation of the rough opening and sill is fundamental to achieving a durable and weather-resistant window installation. The guide emphasizes the importance of these initial steps in preventing moisture intrusion and ensuring the long-term performance of the window assembly. #WindowInstallation #Housewrap #WaterResistiveBarrier #RoughOpening #FlashingTape #SillPreparation #MoistureProtection #HomeConstruction #BuildingEnvelope #WindowInstallation #Housewrap #WaterResistiveBarrier #RoughOpening #FlashingTape #SillPreparation #MoistureProtection #HomeConstruction #BuildingEnvelope
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