Bryan Posted October 28, 2009 Report Share Posted October 28, 2009 In Indiana a majority of the state is still under the 2003 IRC with Indiana amendments. With that, and if I am reading the code correctly, the use of a weather resistant membrane is not required under most exterior finishes. However, a weather resistant membrane or water repellent sheeting is required under masonry veneer. On a large number of the new homes in our area they are using foam insulation board for the exterior sheeting (water repellent sheeting). Therefore, how does one go about properly detailing wall penetrations and windows? I typically see 4 inch butyl flashing tape used around the window; however, it is just adhered to the foam board. I am of the opinion that the tape will fail much sooner than later and then you have a leaky window, door or wall penetration. Additionally, this same theory can be said about all horizontal sheathing joints that have been taped. I have seen somewhere; however can't remember where, where the sheathing board should have a "Z" type flashing at all horizontal joints. This could be as simple as a piece of house wrap tucked under the upper board and draped to the exterior side of the sheet beneath. Should this same principle be utilized at all windows, doors and wall penetrations? Bryan Quote Link to comment Share on other sites More sharing options...
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