Reliabilt-window-mull-kit-instructions

: Lay the windows side-by-side on a flat surface. Use a utility knife to trim any excess vinyl "welds" or protruding edges from the corners where the windows will meet to ensure a flush fit.

: You can find series-specific PDFs (e.g., Series 105 or 150) on the ReliaBilt Installation Support page . reliabilt-window-mull-kit-instructions

: Align the windows and press the mullion strip (the H-shaped or snap-on piece from your kit) into the channel. You may need a rubber mallet to gently tap the strip into place until it snaps securely. : Lay the windows side-by-side on a flat surface

: Apply additional silicone sealant to the top and bottom of the mull joint, filling any voids. If your kit includes a drip cap or mull bridge , install and seal these over the top and bottom exterior joints. Helpful Resources : Align the windows and press the mullion

: Run a continuous bead of 100% silicone sealant along the entire length of the channel where the windows will connect. This step is critical for preventing air and water leaks.