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Old 06-28-2012, 02:19 AM   #1
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new construction window over old layer of siding


I plan on installing a new construction window with nailing flange. I have vinyl siding. Under the vinyl siding there is a layer of fanfold and the old siding. I know i will be removing vinyl siding to install window, but my question is do i install window over the fanfold and old siding, or would it be better to remove the old siding far enough for the flange to meet the sheeting. I will be using self adhesive flashing over the flanges once installed.

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Old 06-28-2012, 05:44 AM   #2
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new construction window over old layer of siding


the flanges go directly on the siding. Then the flashing tape which gets covered at the top with the weather barrier (tyveK) from above. Caulk the underside of the flanges at the top and sides but not the bottom. this remains open to allow any water that does get into the cavity to drain out. Remember to add sill pan and flashing under the window also.

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Old 06-28-2012, 08:07 AM   #3
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new construction window over old layer of siding


Is using a new construction window the right solution here? Doesn't sound like it.
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Old 06-28-2012, 10:19 AM   #4
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new construction window over old layer of siding


Flanges need to be nailed in contact with the sheathing, not the siding, and not over the fan fold. The fan fold can be cut back enough to fit the flange, once nailed up just reinstall it and tape the seam. Make sure to caulk behind the flange as Bob suggested and the way he suggest to do it.
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Old 06-28-2012, 10:37 AM   #5
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new construction window over old layer of siding


Just for clarity. You say you plan on installing a new construction window with flange? Is there an existing window there? If so , you will be doing a lot more work then what these guys are saying, although their information does seem to be correct. If there is an existing window, and you do have a new construction flanged window, you will be pulling the old frame which would require quite a bit of work to get it out.. Just my thoughts.
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Old 06-28-2012, 10:50 AM   #6
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new construction window over old layer of siding


Since when do people nail widows over siding. Never.heard of such a ridiculous thing like that before.
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Old 06-28-2012, 12:22 PM   #7
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new construction window over old layer of siding


What type of siding is under the vinyl siding?

What type of brick mould is on the existing windows?
Could you post some pics?
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Old 06-28-2012, 02:57 PM   #8
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The flange nails to the sheathing only...remove all layers/sidings/etc. Nail and flash per installation instructions. Leaving anything between the flange and the sheathing is a potential for flashing failure.
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Old 06-28-2012, 04:04 PM   #9
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new construction window over old layer of siding


The window could certainly be installed directly to T-111 or any other flush profile siding assuming that siding is in sound condition and proper flashing details are followed before the vinyl is re-installed.

If the original siding is shiplap or shingles it's also an option to cut out the siding and pack out the sheathing flush to the original siding depending on the frame reveal desired, inside or out.

Point is there are options to the install other than going back to the original sheathing as long as the flange is secured to a solid flat surface, which fanfold is not.
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Last edited by kwikfishron; 06-28-2012 at 07:37 PM.
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Old 06-28-2012, 04:12 PM   #10
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new construction window over old layer of siding


Quote:
Originally Posted by kwikfishron View Post
The window could certainly be installed directly to T-111
You'll have trouble properly sealing the head flashing with the vertical seams in T-111.
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Old 06-28-2012, 04:37 PM   #11
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Quote:
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You'll have trouble properly sealing the head flashing with the vertical seams in T-111.
If the Vinyl siding was over T-111 Iíd be using a weather barrier off a roll and not fanfold so thatís not an issue.

Nobody has any idea exactly what OP has other than VS with fanfold so there certainly can be more than one option.

The only purpose of my post was to say there are cases where a flange window can be installed directly to original siding when vinyl or any other new siding is being installed over the original.
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Old 06-28-2012, 07:44 PM   #12
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new construction window over old layer of siding


Quote:
Originally Posted by AGWhitehouse View Post
The flange nails to the sheathing only...remove all layers/sidings/etc. Nail and flash per installation instructions. Leaving anything between the flange and the sheathing is a potential for flashing failure.

this is not always the case,depends where your drainage plane is which could be some distance away from the sheathing
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Old 06-29-2012, 12:50 AM   #13
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new construction window over old layer of siding


Thanks to all for your responses. The window is going in a bathroom that i have gutted to the studs and will be making the opening larger than the previous window. I wanted to use the new construction window with flanges because i have seen previous posts stating they can be sealed more properly with flashing and so that is what I have ordered. Anywayz I like the idea from AGWhitehouse, seems like a better seal can be had by removing the old siding.
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Old 06-29-2012, 07:31 AM   #14
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new construction window over old layer of siding


Quote:
Originally Posted by Bob Mariani View Post
the flanges go directly on the siding. Then the flashing tape which gets covered at the top with the weather barrier (tyveK) from above. Caulk the underside of the flanges at the top and sides but not the bottom. this remains open to allow any water that does get into the cavity to drain out. Remember to add sill pan and flashing under the window also.
Bob
You mean on the sheathing not the siding- if figured it was a typo.

BTW I am camping at the state park on Lake Zoar in a few weeks.
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Old 06-29-2012, 09:14 AM   #15
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new construction window over old layer of siding


We nail the flange in contact with the sheathing, to seat down the nailing flange it needs to remove the old siding

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