Exterior trim around a window serves two purposes.
Installing vinyl window trim.
Install the tops first then the sides and then the bottoms of the window surrounds.
In most cases the old frame dimensions will match a standard size vinyl window.
Most trim carpenters don t even use a tape to trim windows.
Along the tops install j channel trim with horizontal siding and base trim with vertical siding.
Double check these retrofit window installation measurements to ensure their accuracy so you don t end up with a window that doesn t fit.
Use these retrofit window installation measurements to order the windows from a lumberyard or home center.
Here s how they do it.
For a wood window unit drip cap flashing can be installed over the trim piece often called brick molding that comes.
When installing window molding start at the top.
Unscrew and remove the storm window from the outside of the window.
The type and location of the flashings will vary depending on the type of windows and doors.
It s all done by eye with a sharp pencil a miter saw and an 18 gauge nailer.
It is decorative providing a contrast to the area around the window and also it keeps water from.
For even more personality and charm add a decorative corner or crown molding above the door or window.
If you have vinyl or metal flanged windows for instance you can install drip cap flashing 4 the home depot over the window itself or over the top trim piece that you install.
Lineal trim can help unify and accent a home s exterior adding a design element that can be both subtle and distinctive.
Install door window trim.
Cut a 45 degree angle on one end of the trim and hold it so the short end of the angle.
Instruction on how to install exterior 2x4 trim around a new or old window.
In this video this old house host kevin o connor adds window trim to vinyl siding with the help of vinyl siding installer richard scalzi.
Before installing door and window trim first caulk around the openings to create a moisture and air proof seal.