Installing Window Trim and Door Trim

Download this page as a printable PDF

Tools and Supplies You'll Need

  1. Screws or Finish Nails - use screws or nails that are long enough to go through the Ledger and firmly attach to the wall behind it. If using screws, we recommend a narrow head screw (such as a #1 Robertson head trim head screw) to make touch-up easier and less noticeable. If the application is on the exterior or in a wet location we recommend exterior grade fasteners.
  2. Construction Adhesive/Glue - we recommend either PL® Premium Construction Adhesive, PL® Premium Advanced 3X Construction Adhesive (which has 3x faster bonding), or Great Stuff Pro
  3. Screw gun with the appropriate tip for the screws being used. (if applicable, and necessary)
  4. Hammer and nail set (if applicable)
  5. A saw for cutting the trim to fit – a circular saw, jig saw, band saw, table saw, or hand saw, it is your preference. Any woodcutting blade used with these saws work great and cut smooth and easy.
  6. Tape Measure
  7. Caulking gun for applying the Adhesive/Glue and Caulk.
  8. FauxPanels® color coordinated textured caulk (if applicable)
  9. Touch-up Kit (if applicable, and necessary)


The door and window trim can be installed indoors, or outdoors, on any reasonably flat surface that is clean and is in structurally sound condition. The trim should be installed prior to installing any FauxPanels® for a seamless look.

Before installing manufactured stone, wipe down or brush off the surface and trim.

1.) Begin the Window Trim installation by making sure the surface the trim will be attached to is clean. Wipe the surface with a rag. Use a wire brush on harder surfaces. Wipe clean the back of the panels as well.

Acclimatize the Trim to roughly the same temperature and humidity as the installation surface for about 24 hours. Avoid storing trim in direct sunlight or close to heat sources.

Plan out window trim placement and determine corner type.

2.) Plan the layout of your manufactured stone trim to best suit your needs. Decide how you would like to address the corners, either mitering the corner or butt joints.

Measure and mark window trim to ensure a proper cut.

3.) Measure, mark, and cut the window trim to fit. If a visible grout line is wanted, cut an extra 1/16” off of each mitered end of the trim to create space for the caulk to form a grout line.

Dry fit faux stone window trim for proper placement prior to gluing and nailing.

4.) Dry fit the trim to insure a proper fit.

Proper application of adhesive will give your window trim a strong hold.

5.) Apply two beads of the Construction Adhesive to the back of the window trim as shown.

A slight twist when placing your window trim will create strong contact to the wall.

6.) Apply the Trim to the wall. Use a slight twisting motion to help ensure good contact with the glue/adhesive and the wall.

Using finish nails or screws will help the window trim hold in place.

7.) Begin fastening the manufactured stone trim to the wall with screws or finish nails. Use these fasteners approximately every 16” or as needed. All screws or finish nails should be very slightly recessed below the surface of the Trim. Do not over tighten the screws. Use a nail set to recess finish nails. Use exterior grade fasteners if the Trim is being installed in high moisture areas.

Textured caulk in the window trim seam ensures a good seal and great look.

8.) Add the textured caulk to the seams where the manufactured stone pieces meet. This is very important to ensure a weather-tight seal. Use caulk to fill the screw or nail holes. (You may want to use the paint for the touch-up kit to help conceal the caulk that has filled the screw and nail holes.)

Remove excess caulk from the window trim with a damp rag.

9.) Before the texture caulk dries be sure to use a damp rag to wipe off any excess caulk, especially where it may have squeezed out from the joint between the two manufactured stone pieces. The Installation of the Trim is complete.

When installing panels, give the window trim a bead of caulk in the outer crease.

10.) Before installing the FauxPanels® up to the door or window trim, apply an ample bead of the Textured Caulk in the crease between the Trim and wall.

Window trim and faux panels make a perfect pair.

11.) Install the FauxPanels® as directed in the appropriate FauxPanel® instructions. Before the texture caulk dries be sure to use a damp rag to wipe off any excess caulk that may have squeezed out from between the joint between the FauxPanel® and the Trim.

Alternate Installation Method Using Glue Only (no screws or nails)

Follow the directions 1-4 as stated above.

Apply beads of glue to the window trim as directed.

5.) Apply a bead of the Great Stuff Pro Adhesive to the back of the window trim. Wear gloves when using the Great Stuff and follow the directions on the can.

A light twist of the window trim will allow better glue coverage and adhesions.

6.) Apply the Trim to the wall. Use a slight twisting motion to help ensure good contact with the glue/adhesive and the wall.

Hold the manufactured stone trim to the wall until the glue sets.

7.) Hold in place for a few minutes till the glue holds the manufactured stone trim in place.

Now go to step 8 above to continue installation.

Important Info...

Be sure to follow and obey all safety rules and recommendations set forth by tool manufacturers. Always follow any, and all, local, state, and federal building codes.

Always comply with any specified clearances set forth by the manufactures of stoves, fireplaces, furnaces, and any other heat sources, as well.