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Old 08-13-2007, 12:21 PM   #1
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Installing Windows


I noticed that some manufactures do not recommend installing flashing tape on the bottom of the window over the nail flange.

Do you recommend?

Also some say that sealant should be applied along the edge of the rough opening over the tyvek. Is this necessary?

Thanks!

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Old 08-14-2007, 06:28 AM   #2
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A membrane goes over the rough sill before the window is installed and the nailing flange gets nailed through that. This will allow any water that may get trapped a way out.
Somebody correct me if I'm wrong but I think the only flange that gets covered with a membrane is the top of the window.

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Old 08-14-2007, 06:32 AM   #3
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See this construction detail at the Grace Vycor site;

http://www.na.graceconstruction.com/...00.html&did=26
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Old 08-14-2007, 06:50 AM   #4
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What about the sealant around the jams?
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Old 08-14-2007, 07:07 AM   #5
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Quote:
Originally Posted by sandyman720 View Post
What about the sealant around the jams?
Yes, put a bead of silicone sealant around the flange of the window or around the rough opening so the flange will come in contact with it.
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Old 08-14-2007, 07:58 AM   #6
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So put it on the tyvek around the windows?
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Old 08-14-2007, 08:17 AM   #7
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Quote:
Originally Posted by sandyman720 View Post
So put it on the tyvek around the windows?
See this Tyvek document. Look at page 6 and they illustrate the sealant going around the perimeter of the rough opening and there's also some flashing details. One point of contradiction though... Dupont says not to apply sealant across the bottom sill flange. Anderson window installation instructions says you do. I would refer to the recommendations of your window manufacturer for the specific instructions on this. Not knowing who's windows you are using I went on the Anderson guidelines.

http://www2.dupont.com/Tyvek_Constru...ing_K16280.pdf
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Old 08-14-2007, 09:37 AM   #8
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What is the best type of caulk to use for this? Clear Silicone that can be used with Vinyl?
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Old 08-14-2007, 10:23 AM   #9
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Quote:
Originally Posted by sandyman720 View Post
What is the best type of caulk to use for this? Clear Silicone that can be used with Vinyl?
http://www.dap.com/product_details.aspx?product_id=292
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Old 08-14-2007, 10:42 AM   #10
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I thought it made more sense to cover up the nailing flanges on the sides of the window. This Old House got it wrong on the Carlisle project.
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Old 08-14-2007, 11:35 AM   #11
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Quote:
Originally Posted by Clutchcargo View Post
This Old House got it wrong on the Carlisle project.
What did they do... leave them exposed?

Here's a picture of how not to flash. It's a beaut ain't it? Tyvek ripped, top of the window flashing all crumbled up, sheathing exposed. Boys, it's hard to find good help these days.
Attached Thumbnails
Installing Windows-winhownotto.jpg  

Last edited by SecretSquirrel; 08-14-2007 at 11:43 AM. Reason: Added Pic
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Old 08-14-2007, 11:55 AM   #12
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Clutchcargo -

Maybe the This Old House is one factor in the rediculous number of improperly installed windows (estimated at 60-70%). Unfortunately, you do not know they are improperly installed until it is a few years too late.

For those that are interested, there is a program to become a certified window installer. Some builders will only sub out to certified installers or they invest the time and money to get their own people trained and certified. The certification class is supported by the window manufacturers and is provided for a fee ($300-$400??? when i took it) by independent construction oriented firms.
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Old 08-14-2007, 12:34 PM   #13
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Quote:
Originally Posted by SecretSquirrel View Post
What did they do... leave them exposed?

Here's a picture of how not to flash. It's a beaut ain't it? Tyvek ripped, top of the window flashing all crumbled up, sheathing exposed. Boys, it's hard to find good help these days.
They covered the rough sill, then covered the left and right trimmers, installed the window, then put the last piece over the top flange. Maybe there was some other reason they did it that way. They were using the pre-fabricated panel construction. It looked like they didn't use a house wrap on that portion as well.

Quote:
Originally Posted by concretemasonry View Post
Clutchcargo -
Unfortunately, you do not know they are improperly installed until it is a few years too late.
As soon as the adhesive starts to let go, right?

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