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Posted by Al Bundy on July 10, 2007, 8:52 am
>> Anderson phone support was a joke. I won't go into it.
>>
>> Here's the jamb extensions:http://tinypic.com/view.php?pic=53u72fm
>>
>> Never used jamb extensions. Extensions ordered separate from window.
>> No paperwork with them. Anderson window instructions show a page
>> about installing them. Also some info on Anderson web site. All docs
>> show a solid flat side on all surfaces. Pic above shows a channel.
>> Does channel face the RO or the visable side?
>>
>> If facing the RO, what purpose does it have other than to weaken and
>> promote splitting when nailed?
>>
>> If facing the visible side all I can figure is to aid in nailing at
>> an angle...as well as to weaken and promote splitting when nailed?
>>
>> If you ask me it will look like crap if it's visable. The channel at
>> the sill will end up being a collection place for any
>> moisture/condensation. Window going in bathroom. Inside/outside temp
>> difference can be 90-100 degrees mid-winter. Let's not go off on a
>> tangent about ventalation fans, opening doors and all that.
>
> That channel - actually more of a culvert - is to facilitate nailing
> from the back side. The culvert - really more of an angled face with
> a relief cut - faces the framing, so it's hidden. That angled face -
> really more of a channel - facing the inside of the room, allows you
> to start the nail easily.
So you are saying either way is correct depending what poison you wanna
pick?
>
> Extension jambs can be attached to the window prior to window
> installation, but that presents problems with extension jamb depth if
> there is any discrepancy in wall thickness.
The depth seems to be very close since the wall is pretty std - 7/16
sheathing + 5-1/2 stud + 1/2 drywall= 6 7/16". Jamb ext marked for 6-
9/16. I was thinking belt sander from the inside where necessary. But of
course, ripping 1 or 2 16th's prior to install would be easier.
> If the extensions are
> attached after window installation, it's pretty tough to get a nail
> started in the narrow space between the framing and the side of the
> extension - particularly since the nail is at such an angle to what
> would normally be a flat face of an extension jamb.
Yea, I can see that one just looking at it.
>
> It's really not all that necessary in my mind as I typically pre-drill
> anyway and start the nails before I put the extensions in place.
Do you do nailing straight into the narrow extension face with 3-1/4
finish nails (figuring 2-1/4 ext depth then straight into window jamb end
face). Use trim screws on corners?
> I
> also usually don't use store-bought extension jambs.
First timer on these. Figured I'd try it with OEM ones for simplicity. So
much for that.
>
> R
>
Thanks for the reply.
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