Installation Instructions

CertainTeed Vinyl Siding Installation Guide

Installing Trimboards around exterior doors

Flash the door according to the manufacturer’s speciﬁcations.

Once the opening is properly ﬂashed, begin by determining the

length of the trim along the sides of the door by measuring each

side. Start at the top of the door and drop down to the desired

termination point. Using these measurements, cut the second and

third sections of Restoration Millwork. Apply these pieces to the

left and right sides of the door, verifying that the top edge of each

section lines up with the top of the door.

To determine the length of the top piece of trim, begin at the left

side of the left piece of trim and measure to the right side of the

right piece of trim. This measurement should equal the width of

the door plus two times the actual width of the trimboards being

applied. Cut the ﬁnal piece of trim and apply it at the top of the

door, again verifying that the left and right edges of the cut section

line up with the left and right edges of the trimboards in place at

the sides of the door.

Once the top section of millwork is in place, apply ﬂashing in

compliance with local building codes.

Occasionally you will need to create a pocket to accommodate a

nailing ﬂange:

1. Measure the width of the nailing ﬂange of the window at the

opening where you plan to apply the trim.

2. Set the blade depth of your table saw approximately 1/8"

higher than the width of the window nailing ﬂange.

3. Set the table saw fence so you are cutting away only the

thickness of the saw blade from the trimboard.

4. Make one cut from the back side of the trimboard on your

table saw.

5. Check to be sure the trimboard will lay ﬂat against the wall and

that all joints are tight before fastening. If the boards do not

lay ﬂat against the wall or joints are not tight, repeat the above

instructions starting at step 3.