EIFS Preparations for Rough Openings Specification
A complete overview of EIFS Preparations for Rough Openings Specification
In this post we are going to take a look at EIFS Preparations for Rough Openings Specification. Rough openings are normally thought of as door and windows openings, but what also falls into this spec are expansion joints and the top of parapet walls. Dryvit’s Aqua Flash is applied to the jam. The material is applied to cover the entire jam, and down on the OSB substrate at least two inches. It is important to apply a coat of liquid moisture barrier over the substrate. If you are working with OSB as your substrate the substrate will be coated with Backstop NT Smooth, and all the joints will be coated with Grid Tape and Backstop NT Textured. When applying the Aqua Flash starting at the bottom and working your way up is the technique. The corners will have a small strip applied to cover the area where the Aqua Flash meets. The entire area must be covered with the Aqua Flash cloth and overlapped two inches. The Aqua Flash liquid is applied to the jam and the cloth is embedded in the wet liquid. Then another coat of the liquid is applied over the cloth and if necessary a third coat is applied. When the Aqua Flash is completely dry the substrate (OSB) is coated with another coat of Backstop NT smooth. So to sum it up, the joints in the OSB are covered with Grid Tape and Backstop Textured. Ten when that is dry the substrate is coated with Backstop NT Smooth. Then the Aqua Flash is applied to the rough opening. After the Aqua Flash is dry another coat of Backstop NT Smooth is applied.
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Here is the spec from the Dryvit™ website