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Mstrlucky74 03-27-2013 04:50 AM

Window sill/returns
 
Just installed (2) nice windows and dont't want to sheetrock the sill or sides and top return. What type of wood is most commonly used for this? Does anyone have any pics of some nice setups/installs of this so we can get a visual? Thanks

mj12 03-27-2013 05:42 AM

cheapp pine, then it is painted.

oh'mike 03-27-2013 06:07 AM

Jamb extenders---that is the name----I use clear pine or poplar----many windows have a groove to allow for the installation---take a picture of the window and wall so we can offer some suggestions.

Do you have a table saw?

Mstrlucky74 03-27-2013 06:18 AM

Quote:

Originally Posted by oh'mike (Post 1146792)
Jamb extenders---that is the name----I use clear pine or poplar----many windows have a groove to allow for the installation---take a picture of the window and wall so we can offer some suggestions.

Do you have a table saw?


Yes have a table saw and someone who is(use to be a carpenter...:(..lol)

I will get a pic to you tonight. Thanks.

oh'mike 03-27-2013 06:35 AM

Adding a jamb extender to a wood window is rather simple---vinyl ones need a bit of creativity---

Frequently the window is not set straight to the wall board---so measure the depth at each corner and cut tapered jamb extenders if needed----

I keep a 6" adjustable tri-square in my pouch and use that as a depth gauge----

Mstrlucky74 03-27-2013 07:04 AM

Quote:

Originally Posted by oh'mike (Post 1146809)
Adding a jamb extender to a wood window is rather simple---vinyl ones need a bit of creativity---

Frequently the window is not set straight to the wall board---so measure the depth at each corner and cut tapered jamb extenders if needed----

I keep a 6" adjustable tri-square in my pouch and use that as a depth gauge----

Right now all the sheetrock is up on my walls except around the new windows there is just r/o wood frame....

joecaption 03-27-2013 08:55 AM

Make sure the foam has been added on all sides to fill any gaps before trimming.
Are you going to at least have a window stoor, or are you going to do what called a picture frame? If your going with a stool you first have to install the stool before the jamb extentions. (That piece at the bottom of a window on the inside is called a stool not a sill, the sill is outside)
I've found the ladys like a wider stool so they have a place to set there fofo stuff.
Make sure the stool is going to be stick out on each side past whatever casing your going to use.
Once the stool goes in you install the apron under the stool to support it, it's slightly shorter then the stoop on each end, 1/2" works.

The top extention goes in first, then the sides, reason being the sides will hold the top piece tight to the header.

When installing the casing I'm sure everyone has there own way, but what's worked for me is to mark the exposure line on the ends of the jamb extention and use a 12" scrap piece of the casing and set it on the lines at the top of the window and mark the outside where it's going to sit and make a faint line on the top area. This way you will have to faint lines that you can now use to measure how long the pieces need to be.
The top piece gets installed first.
Reason being it's very important that 45 deg corner is tight.
When you go to set the side pieces you first make sure the top is 100% flush.
Sometimes in older houses you have to sand off some of the material on the back side of the 45 deg. cut to get them tight.
Use some Tite Bond II in the joint.
It gets nailed down from the top and into the sides, then start working on the face nails down the sides starting at the top.
But that top corner has to be nailed enough that it will not move as your trying to line the casing up to the exposure lines.
Casing is almost never 100% straight so you have to flex it into place.

If you find the casing is not laying flat on the wall and the extention you can sand the outside edge of the extention up to the exposure line.
If this is an old plastered wall or sheetrock over old lumber there's going to be some gaps on the outside edges of the casing to the wall. Caulking will take care of that when your done.

Hope that all makes since. Once you get working on it you'll figure it out.

Make sure all your cuts on the jamb extention go toward the window not the casing.

jagans 03-27-2013 09:48 AM

A couple of additions:

Your jamb extensions must be level (Top) and plumb (sides) so you are going to install the top piece level, then temporarily install the sides plumb with a couple of finishing nails that you leave sticking out for removal. Shim side extensions plum as needed. Now you can measure the total width of your sill. This is going to be the inside dimension between side jamb extensions, plus 3/8 for 2x casing reveal (3/16"), plus casing width x 2, plus 1.5 inches for sill ears.

You then notch your sill to fit, and install level. Then cut down and install your side jamb extensions, then you case, top first with 3/16 reveal, then sides, then case under sill. Sill ears should extend 3/4 inch beyond casing.

Beepster 03-27-2013 10:11 AM

A question to add to this post:

why can't you build the top, sides, and bottom as a box in your garage and slide into place, shimming around the front so that it meets the window frame perfectly? Obviously build exactly so that you have the same exposure of the window frame all around.

My jamb extenders are for basement windows built into the block foundation. My jamb extenders are going to be 10-12". How do you shim all the way to the window?

B

Mstrlucky74 03-27-2013 10:19 AM

Quote:

Originally Posted by oh'mike (Post 1146809)
Adding a jamb extender to a wood window is rather simple---vinyl ones need a bit of creativity---

Frequently the window is not set straight to the wall board---so measure the depth at each corner and cut tapered jamb extenders if needed----

I keep a 6" adjustable tri-square in my pouch and use that as a depth gauge----

Just goggled it.....but why and what determines if I will need a jamb extender? Thanks.

joecaption 03-27-2013 10:23 AM

How else you going to cover up the R/O and window tape?
An extention is what you install from the window frame to the face of the wall.

Duckweather 03-27-2013 10:32 AM

Quote:

Originally Posted by Beepster (Post 1146965)
A question to add to this post:

My jamb extenders are for basement windows built into the block foundation. My jamb extenders are going to be 10-12". How do you shim all the way to the window?

B

I use a bundle of shim, (junk), cedar shingles. rip a bunch about 1" wide. Insert the thick end of one first, trim it if it's too thick, put the second one in on top of it thin end first. Slide, (pull on), the first one while holding the second and they get wider to fill the space. Sometimes you may need more than one set if the gap is wider, but always use in pairs so they stay parallel. If you happen to have a rough opening that is not square with the wall then you can use two one way and one the other to match the unparallel space.

Mstrlucky74 03-27-2013 11:02 AM

Quote:

Originally Posted by joecaption (Post 1146974)
How else you going to cover up the R/O and window tape?
An extention is what you install from the window frame to the face of the wall.


Ah.....got it.:thumbsup:ty

jagans 03-27-2013 11:15 AM

Beepster, your situation is (I think) different from the original poster, as you are dealing with masonry. You would be much better off with a new post, but your idea of building a box is not a bad one, if you just want to picture frame the opening. Are these just the small jalousie type casement basement windows, or full double hung windows?

Beepster 03-27-2013 11:25 AM

I know, I hate hijacking threads, but I would like a thread to cover slight variations on the original topic.

It is your basic wood casement window for an egress window in a basement bedroom. The block opening is rough framed in with pressure treated 2 x 12" (?). I just wanted to build a box, slide it in, shim it out, fasten it down, and frame the wall with basic window/door casing trim.

B


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