3-Piece Method to Flash Window Sill

[@kenp3L]

You referenced "Certified Installers" several times. Do you refuse to sell these product to others?

[@WeatherizationPartners]

Not at all. This method of installation is what we tend to teach to crews that wish to become Certified. Anyone can use the method.

[@Anthony-fi9ml]

So why not just do 1 piece?

[@WeatherizationPartners]

You can do that method too. Some builders prefer a 3-piece method to save on cost. Here's a link for other flashing methods: www.dupont.com/products-and-services/construction-materials/building-envelope-systems/articles/how-to-install.html?src=partner_install

[@vicpinto1970]

Because it's cheaper this way. A roll of FLexWrap is not cheap.

[@Anthony-fi9ml]

@@vicpinto1970 I am not in the construction industry. I installed my windows on my new build myself. So I was thinking more so of quality and not cost, but understood.

[@jeffhoch4272]

Not just cost but installation is easier with this method. Working with these self-adhesive flashings can be tricky since they are self-adhesive.

[@cramgod6713]

Wrong way to install the flashing tape

[@WeatherizationPartners]

Cram, thanks for your question. This is an acceptable method to flash the window per DuPont Guidelines. This is a method we teach Certified Installers. Other guidelines available here: www.dupont.com/building/how-to-install.html

[@cadman10000]

This is really outdated. "X" cutting or "I" cutting the house wrap and then folding the flaps inside is no longer acceptable.

[@WeatherizationPartners]

Thank you for your interest in our video. The I-cut is actually an approved method and widely-accepted standard for preparing openings for an integral flanged window. This method, along with other alternate methods, are illustrated in DuPont’s current installation guidelines (www.dupont.com/building/how-to-install.html) and vary based on the type of window. A 3-piece sill method is approved for DuPont Tyvek Certified Installers.

[@richtravis6313]

No slope, back dam. wow lapping and seams, multiple materials where’s the shimming and please don’t insulate the sill with foam