What do you if your wall is thicker then your door or window. Well if you are ordering new ones and are aware of this before placing your order, most often it is best to have the extension jambs factory applied on windows or order the correct jamb width for doors. Here is the typical jamb width on typical wall sizes.
- 4-9/16" - This would be the jamb width for a new 2x4 wall with 1/2" exterior sheathing and 1/2" drywall.
- 6-9/16" - This would be the jamb width for a new 2x6 wall with 1/2" exterior sheathing and 1/2" drywall.
Most door jambs can be ordered to these typical sizes. If you have an older home these dimensions may not apply. Verify the total thickness of the wall. In older homes a full width 2x4 was used, and sometimes with 1" thick exterior sheathing boards. Today thickness is called out in nominal thickness. A 2x4 today is 1-1/2" thick by 3-1/2" wide.
So, now you have a door or window set up to be used in a nominal thickness 2x4 wall. The problem is the wall you have is built from 2x6's. You will need to apply your own extension jamb. Do this by measuring the distance from the window or door unit to the inside finished thickness of the wall. This board or strip is usually made from 3/4" thick wood. It should match the trim that will be installed. Rip the thickness with a table saw.
Once it is ripped. Cut the jambs to fit the perimeter of the window. The easiest way is to nail or screw the jambs together making what will look like a box. Instead of inserting this box against the window frame and shimming. Now is the time to use the EZ-Hang™ brackets. Simply screw the brackets to the back of the extension jambs, insert the extension jambs into the window space and screw the extension jambs to the wall through the brackets. This method is much simpler and much easier to make adjustments.