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Re: Vinyl siding over LP panel
I'm not recommending the windows be moved, only that the peel-n-stick flashing be applies to the windows and to the original siding to serve as a secondary seal (flashing) in addition to whatever was installed originally.
By sealing the windows to the original siding, you are reducing the potential for water to migrate through the window/original siding joint.
By installing the peel-n-stick to the original siding behind the building wrap, you are reducing the potential of moisture using the building wrap as a drainage plane from migrating behind the edges of the building wrap and getting to the original siding.
By installing the second layer of peel-n-stick over the building wrap, you are further reducing any moisture or flowing water which is on the surface of the building wrap from migrating behind the edges of the building wrap.
You end up with two layers of peel-n-stick flashing from the window to the original siding/building wrap spanning the joint around the window, reducing the potential for moisture and water migrating beyond the edges of the building wrap.
It's called 'adding layers of resistance' with the purpose of 'reducing the potential for' leaks - nothing can make that joint waterproof, you are just trying to increase its resistance to leaks around the windows and doors. Then, the main thing you have to deal with is leakage withing the window or door frame itself. Many failures occur within the window assembly itself, those are more difficult to stop. This is only trying to address the failures which occur where the window or door assembly is installed to the structure, around the perimeter of the window or door assembly.
The ASTM E-1105 water penetration test only tests the window assembly itself - for a true ASTM E-1105 test.
However, most testing in the field is done testing the perimeter joint of the installed assembly to also test the waterproofing around the window.
Knowing what a true ASTM E-1105 test tells you is one thing - that the window passes or fails the test.
Knowing that the installed assembly including its perimeter waterproofing actually tells you a lot more.
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