Can anyone explain to me the reason Nudura (and maybe others for that matter) wants the installer to flash around the window opening (without the window installed) with two layers of overlapping membrane, THEN install the window and do it again (minus the sill membrane).  The only reason I could see for this is if termites tunneled through the foam that they could get to the window frame if there wasn't  anything to block them.  From what I understand, they don't like to eat through those membranes. 

I have not heard that. I only see the point of installing a peel and stick flashing over the window flange.

I know, it doesn't make much sense. I'm starting to think that some designer came up with these instructions, instead of someone with experience. They also want you to cut a piece of 3/8" plywood to put between the interior edge of the window and the interior edge of the wall. This is suppose to create a water dam that will prevent water from running into your window opening??? Like there should be any water there in the first place. Not to mention, how would one shim if this piece of plywood was in front of the window? Or how about sealing the sill area with spray foam? All of that would be a real pain if you were to follow their procedures.

Here's the link to their procedures, in case anyone was wondering: http://nudura.com/Libraries/Installation_Manual/9_0_Openings-NUDURA_Insulated_Concrete_Forms.sflb.ashx

Don't know about the flashing but the pl&st looks to be aded insurance for water intrusion.
If your using foam bucks regular wood can be used since it's not in contact with the concrete. Then cover with pl&st for added insurance against rot. Thats what I'm seeing!

Iron is more important for your home windows like when i was in class five then my father install iron windows system this system is very comfortable and run long time after years this system is still with out any problems. we buy houses cash

this detail is designed to capture water seeping along the ICF and through joints in the block being captured by this pocket and allowing t.he water to be absorbed by the concrete rather then seeping out around the window.This is the explanation I got from an engineer in the Ottawa area and he explained that this especially important when using an acrylic finnish on ICF.

Posted By jeepster on 08 Sep 2011 05:50 PM
Can anyone explain to me the reason Nudura (and maybe others for that matter) wants the installer to flash around the window opening (without the window installed) with two layers of overlapping membrane, THEN install the window and do it again (minus the sill membrane).  The only reason I could see for this is if termites tunneled through the foam that they could get to the window frame if there wasn't  anything to block them.  From what I understand, they don't like to eat through those membranes. 

typical flashing is under the frame at the bottom, and over the nail fin on sides and top. Leaving the bottom open allows for any water to draing to the exterior in case the side or top fails