How to Install Extension Jambs

When installing vinyl or other windows and sometimes doors, you may need to add an extension jamb installation. This is particularly difficult in older homes that have thicker walls or newer homes when the extension jambs do not come pre-applied. So what is an extension jamb? It is simply adding a small piece of wood in order to make the window the same depth as your wall thickness. Using shims, this can become quite a difficult process. 

EZ-Hang takes this troublesome task and turns it into a relatively simple process. So if you install windows or doors and they are not the same depth as the wall, look at these instructions for a simple method of installing extension jambs:

Tools and Materials Needed: Extension Jamb Installation

 

  • 3/4″ thick boards for jamb material
  • Table saw
  • Miter Box
  • Trim gun or finish nails
  • Screws and screwgun
  • Insulation
  • Trim
  • EZ-Hang Brackets
extension jamb installation, step 1
Step 1: Measure the depth from your window to the inner edge of your finish wall material.
Step 2: Rip down the jamb material to your needed dimension and cut to length. It’s best to over-lap the top with the side pieces instead of miter them. This gives you an easy way to fasten them together.
Step 3: Now you’re ready to install the EZ-Hang brackets. Lay the cut pieces on a flat surface and attach them to the un-finished or the side towards the wall and the attachment flange facing the outer edge. Space them about every 2 to 2 -1/2 feet apart on each of the four jamb extensions.
Step 4: Lay the jambs on the floor in the order they will go on the window, making a “box” of sorts. Now screw or nail the jambs together. Notice the brackets are close to the corners.
Step 5: Set the “box” in the rough framing hole and simply fasten it to the wall. We recommend evenly spacing the jamb around the window for best appearance. EZ-Hang once again makes it extremely easy to adjust and make your reveals perfect!
Step 6: Add Door and Window Low Expansion Spray foam for insulation. NOTE–ONLY USE door And window foam or stuff with fiberglass insulation
Step 7: Finish by applying desired trim over the EZ-Hang brackets and jambs.
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How to Install Extension Jambs

When installing vinyl or other windows and sometime doors, you may need to add an extension jamb installation. This is particularly difficult in older homes that have thicker walls or newer homes when the extension jambs do not come pre-applied.

So what is an extension jamb? It is simply adding a small piece of wood in order to make the window the same depth as your wall thickness. I have done this for years using shims and I must tell you, WHAT A PAIN. Here is a secret to making this EZ!!!

EZ-Hang takes this troublesome task and turns it into a relatively simple process. So if you install windows or doors and they are not the same depth as the wall, look at these instructions for a simple method of installing extension jambs:

Tools and Materials Needed: Extension Jamb Installation

 

  • 3/4″ thick boards for jamb material
  • Table saw
  • Miter Box
  • Trim gun or finish nails
  • Screws and screwgun
  • Insulation
  • Trim
  • EZ-Hang Brackets
extension jamb installation, step 1
Step 1: Measure the depth from your window to the inner edge of your finish wall material.
Step 2: Rip down the jamb material to your needed dimension and cut to length. It’s best to over-lap the top with the side pieces instead of miter them. This gives you an easy way to fasten them together.
Step 3: Now you’re ready to install the EZ-Hang brackets. Lay the cut pieces on a flat surface and attach them to the un-finished or the side towards the wall and the attachment flange facing the outer edge. Space them about every 2 to 2 -1/2 feet apart on each of the four jamb extensions.
Step 4: Lay the jambs on the floor in the order they will go on the window, making a “box” of sorts. Now screw or nail the jambs together. Notice the brackets are close to the corners.
Step 5: Set the “box” in the rough framing hole and simply fasten it to the wall. We recommend evenly spacing the jamb around the window for best appearance. EZ-Hang once again makes it extremely easy to adjust and make your reveals perfect!
Step 6: Add Door and Window Low Expansion Spray foam for insulation. NOTE–ONLY USE door And window foam or stuff with fiberglass insulation
Step 7: Finish by applying desired trim over the EZ-Hang brackets and jambs.
Buy Now