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Re: Vinyl siding over LP panel
I would recommend (when talking to my clients) that the vinyl siding be removed, the windows be flashed with peel-n-stick flashing which is applied to the windows and the hardboard siding to protect the hardboard siding joint (with proper lapping), then another layer of peel-n-stick to the window and the building wrap (in the proper sequence and lapping), then reinstall the vinyl siding. Do this while explaining the reasoning behind it and what each layer is for.
In my report I would recommend the windows be properly flashed and that the vinyl siding be installed to the windows properly ('J' trim, etc.)
We all know they are not going to do the first thing, it will cost too much, but at least the client will know more about what it takes to seal windows than when they started talking to you. In the report you leave it up to the professional doing the work to do it right. Your client will have some brief and limited background knowledge of what is being done and how wrong it might be.
I hate to assume that the original windows are properly flashed. By flashing them to the original siding, you are reducing (not necessarily eliminating) the potential for leaks. The building wrap under the vinyl siding acts as the drainage plane, keeping much of the water off the original siding, the peel-n-stick flashing keeps much of the water off the original siding and out from behind the building wrap.
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