EIFS Horizontal Joint- Substrate Change Specification
An overview of the EIFS Horizontal Joint- Substrate Change Specification
In this post we are going to take a look at the EIFS Horizontal Joint- Substrate Change Specification. In the field doing repairs we see cracking where there was no expansion joint between substrate changes. To prevent future cracking it is important to follow this specification when dealing with a substrate change. The first thing that needs to be done is the transition area will be covered with Grid Tape and coated with Backstop NT Textured. Over the Backstop Aqua Flash will be applied. A drainage strip is adhered over the Aqua Flash and when the foam is applied it will be notched out for the drainage track. An expansion joint of about 3/4″ will be made making sure to back wrap both sides of the expansion joint. When applying the base coat it is very important that the mesh is covered with the EIFS base coat all the way back to the substrate in the expansion joint without clogging the drainage track with base coat. Obviously if the drainage track is filled with excess base coat it will not work. The expansion joint is primed for caulking and closed cell Backer Rod is placed in the expansion joint and a bead of EIFS approved caulk is applied.
[iframe http://www.dryvit.com/fileshare/doc/us/detail/ds110_28.pdf 635px 785px]