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sandyman720 08-13-2007 12:21 PM

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!

Clutchcargo 08-14-2007 06:28 AM

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.

SecretSquirrel 08-14-2007 06:32 AM

See this construction detail at the Grace Vycor site;

http://www.na.graceconstruction.com/...00.html&did=26

sandyman720 08-14-2007 06:50 AM

What about the sealant around the jams?

SecretSquirrel 08-14-2007 07:07 AM

Quote:

Originally Posted by sandyman720 (Post 57614)
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.

sandyman720 08-14-2007 07:58 AM

So put it on the tyvek around the windows?

SecretSquirrel 08-14-2007 08:17 AM

Quote:

Originally Posted by sandyman720 (Post 57619)
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

sandyman720 08-14-2007 09:37 AM

What is the best type of caulk to use for this? Clear Silicone that can be used with Vinyl?

SecretSquirrel 08-14-2007 10:23 AM

Quote:

Originally Posted by sandyman720 (Post 57632)
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

Clutchcargo 08-14-2007 10:42 AM

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.

SecretSquirrel 08-14-2007 11:35 AM

1 Attachment(s)
Quote:

Originally Posted by Clutchcargo (Post 57641)
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.

concretemasonry 08-14-2007 11:55 AM

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.

Clutchcargo 08-14-2007 12:34 PM

Quote:

Originally Posted by SecretSquirrel (Post 57650)
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 (Post 57652)
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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