Vinyl Windows with T-111 Siding

Vinyl Windows with T-111 Siding Questions and Answers

Vinyl Windows with T-111 Siding questions

Vinyl Windows with T-111 Siding

Robert asked

I want to build a shed using vinyl windows with T-111 siding.   There is no other sheathing under the siding so how should I frame the window openings so the windows don’t leak and how do I cover up the nailing flange on the windows

 Vinyl Windows with T-111 Siding answers


There are several methods of installing vinyl windows with T-111 siding.  One of the simplest and most maintenance free methods is to utilize vinyl brick mold to seal and

vinyl brick molding image

Vinyl brick mold

vinyl window without J-channel

vinyl window without J-channel

cover the nail flange.  I recommend using  vinyl windows that do not have built in J-channel.  If it does have a built in J-channel extra care must be exercised to ensure a good seal between the J-channel and the vinyl brick molding.


  • Frame window opening to the rough opening size recommended by the window manufacturer
  • Install T-111 siding with window openings cut out to the same size as framing
  • Wrap jamb with plastic vapor barrier that covers framing and extends about 3 or 4 inches onto the t-111
  • Apply a liberal bead of caulk on the window wrap all the way around the window opening
  • Set the window in the opening ensuring that the caulking seals the window flange to the wrap on all sides and nail the window in place
  • Apply a continuous bead of caulk on the face of the nailing flange centered over the nails/nail slots and another bead on the adjacent side of the window jamb
  • Cover the nailing flange by installing vinyl brick molding around all four sides of the vinyl window in a “picture frame” configuration
  • Use PVC glue or adhesive caulking on the corner miters to prevent water infiltration
  • Caulk the exterior of the brick mold to seal it to the siding/window wrap with special emphasis on the top
  • For increased weather protection install a metal or vinyl drip cap over the window

This method will make the window installation watertight, mostly maintenance free and allow for replacement of the window if needed without having to disrupt the siding.   Routine maintenance such as caulking and painting will extend the life of the shed indefinitely.




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About Tony Wood

Tony is a life time resident of North Carolina with over 40 years experience in multiple facets of the industrial, commercial and residential construction industry. For the past 33 years he has owned and operated Wood's Home Maintenance Service, providing services primarily in Johnston, Wake and Sampson Counties of North Carolina. ______________ ______________________________________________________ The information contained in this Blog is opinion derived, from hands on experience of over 40 years in the construction industry and by extensive research by the author. All postulations are referenced to the geographic location in which this experience was gained.
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One Response to Vinyl Windows with T-111 Siding

  1. Sierra Blackman says:

    Vinyl windows are a great looking way to add value to your home. They seem like they are pretty easy to maintain, which is a really nice feature. I also liked how you described how to install them while also keeping them water tight. This seems like it would be really important to prevent moisture causing damage to your home.

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