Pella 812W0100 User Manual
Page 9
A. Insert backer rod into the space around the window
approximately 3/8" deep. This should provide at least a 3/8"
clearance between the backer rod and the exterior face of the
window.
Note: Backer rod adds shape and depth for the sealant line.
B. Apply a bead of high quality exterior grade sealant to the
entire perimeter of the window.
C. Shape, tool and clean excess sealant. When finished, the
sealant should be the shape of an hourglass.
Note: This method creates a more flexible sealant line
capable of expanding and contracting.
5A
5B
5
SEALING THE WINDOW TO THE EXTERIOR
WALL CLADDING (continued)
Additional cutting patterns:
Circle Head
Full Circle
Trapezoid
Octagon
Arch Head
Rectangle
Quarter Circle
Half Circle
Oval
Dog House
Right Triangle