How To Install Jamb Extensions

Remodeler Mike Sloggatt: I'g here to trim out this window, so the first thing I demand to do to get started is remove this foam.

I accept to add together extension jambs to the window to trim it out. I need the jambs considering this window was built for a ii×4 wall with drywall. This wall is plaster with ¾-inch sheathing on the exterior. I need to effigy out what the distance is between the window and the border of the plaster, and will check it in a number of places since the thickness of the plaster may differ. It looks similar ¾ inch is the correct size for the extension jambs.

I made a little mockup and then that I tin can run into exactly how this stool is going to sit in relation to the window. That will give me a proficient idea of where to commencement the extension jambs. I'll cut them outset before I starting time trimming out the window.

Measure from the summit of the stool to just about the top of the window. This is a long measurement and doesn't have to be that precise. The width of the window at the top is a really important measurement. Hook the tape in the groove on 1 side and bring it over to the other side. That's going to be 28 and 7/eight.

Extension jambs and measurements

I'one thousand going to start with the vertical jamb extensions. I personally similar to use an interior mucilage for that. I set the adhesive first for the left side. The jamb should be just slightly college than the stool. I pin the jamb in place. Next, I use a combination square to set the offset. This mode, I go a consistent reveal around the unabridged window. Exercise the same procedure on the other side of the window. Then do the head jamb using the aforementioned method.

Then I outset cutting and laying out the sill. I mocked up the trim for this lesser corner for the ¼-inch starting time for the jamb. I tack it in place with a brad, so ready a mockup of the stool. I like the miter to break at the exterior edge of the casing; information technology looks really sharp. If I marker the mockup of the stool hither on the wall and on the other side, and then I know exactly how long the stool needs to be. I can cut the casings, cutting the stool, and everything volition fit and come together.

I like to mark off the reveal commencement, so I can get very accurate measurements and only have to cut the casings once. I mark the reveal on each side of the window, at the top.

I need to measure for the casing at present. I claw the tape on the bottom of the extension jamb I but installed and bring it right upward to the line at the top. I've got 50 inches hither. Now cheque the other side—I've got the same measurement, fifty inches. Measuring from side to side is disquisitional. I've got 29 and 5/16. A lot of guys like to fire an inch to go a real accurate measurement, but I think that'southward dangerous. I'd probably cut the wrong mark. If annihilation, I'll fire ten inches. So, the measurement is 39 and five/16—and I tin tell it's x inches too long. I inch I tin't see.

Before I put on the casings, I take my foam gun and touch up the areas where the shims were, creating a skillful seal.

Cut the stool and apron

I'm going to mark upwards the stool now. To do that, I have the marks I made on the wall and annals them to the window. Mark the outside of the miter and also marking where you'll take to brand a relief cut to fit over the plaster. I mark the other cease of the stool the same fashion. Next I have to figure out how much to accept out—it should be ¾ inch, the size of the extension jamb. An easy way to do this is to slide the stool back and make a scribe line at the border of the plaster. That'southward how much y'all take to have off so that the stool clears the plaster.

I remove the stool from the window and, using the combination foursquare, extend the lines beyond the stool. So, when I take it exterior, I volition cut the correct lines. I'll exercise a self-return on the miter. I also measure ¾ inch in from the back edge of the stool and marking information technology. I'yard going to remove all the material behind that mark.

Once the stool is cutting, I dry-fit it. It looks practiced. I use some adhesive and tack information technology into place. Then I can make the apron underneath and finish it up. I cutting a couple of self-returns for the window stool. Merely put a little glue on them and clamp them into position. I want a good solid surface to smash to, so I put a filler in below the stool.

To mark out the apron, I like to have an fifty-fifty overhang or reveal. I put up a sample piece and measure out seven/8 inch to the nosing cove and make a mark on the wall. Do the aforementioned on the other side. Measure between the two lines; it'south non an authentic measurement, merely I've got 34 and ¼. I go exterior to cutting the apron with self-returns on it. I need to marker on the base of the frock where to cut the total cocky-return. I lay the piece flat on the circular saw. When I bring the bract down to cut it, I let the bract stop outset. If I selection it back upward earlier information technology stops, ane of the teeth will catch the piece and throw information technology. You'll lose the piece.

I like to put the self-returns on earlier I install the frock. You could clench it, merely I'll utilise a 23-gauge pinner instead.

I put a lilliputian glue forth the bottom of the stool to make the connection really expert. The lines I used to mensurate from are the lines I use to register the apron. Push it upward nice and tight against the stool, and go on it level.

Finishing the casing

The last thing I need to practise is finish the casing. I've got the two side casings that were precut and the tiptop casing. Just tack the two side casings into position. Use the combination foursquare to check the outset. I have to final fit that top miter; I'yard not certain if it'south going to exist real good or not. Make sure the casing is tight to the stool. Finally, I place the superlative piece. The miters await skilful. I'1000 just going to apply mucilage to the miters of the tiptop piece and set information technology in identify. Clamp information technology at each end and pivot information technology in place.

At that place's a footling dip in the plaster at the left meridian corner, and so I want to make sure the molding will remain in plane. I put a little shim under in that location temporarily until I get the casing set. Pin along the length of the peak casing, and pin the corners, besides.

Earlier I call information technology a mean solar day, I take the stops out and operate the window to make sure it functions properly.

Narrator: After he confirms the window operates correctly, he nails off the casing with a 15-judge cease nailer. The larger nails volition hold meliorate long-term.

Mike: We downsized this window deliberately so we'd have room for all the flashing on the outside, and likewise for the exterior trim to blend in with the house. We're washed. Nosotros'll leave it to the painter to patch the holes and finish it up.

More on door and window trim:

Paint-Grade Interior Trim – The sheer number of bachelor products can brand shopping for interior trim an overwhelming prospect, even for experienced builders. Here'southward a rundown on what's out at that place.

Master Form in Moldings – An illustrated guide to the profiles and proper proportions of casing, crown and baseboard.

Well-Proportioned Trim – Interior trim is such an important element of a room's blueprint that it deserves more than than the petty bit of idea information technology often gets. Proportion is a primal consideration — here's how to go started.

Craftsman-Manner Casing – The simple elegance of the Craftsman mode has fueled its popularity for more than 100 years. Finish carpenter Tucker Windover outlines his method for installing Craftsman-manner window casing.

Perfect Minter Joints Every Time – Veteran trim carpenter Jim Chestnut shares his time-tested process for installing miter joints. The fob is to assemble the trim with biscuits beginning, then boom the assembly in identify.

Source: https://www.finehomebuilding.com/project-guides/windows-doors/how-to-install-interior-extension-jambs-and-window-trim

Posted by: emersonscrims.blogspot.com

Share this post