How to Properly Flash a Window 

From a glazier to a framer, we’ll done! Exactly how I do flashing and install.

Nice job guys! That's a proper way to install a window and I've been installing new construction and replacement windows for over 40 years! Nice tight seal!

The corner tape should go in first, then the tape covering the sill on top if it. I understand that there is still tape going over that, but it's best practice to cover all your tape edges unless they are adhering to the wall or framing

How lucky is Shane getting taught off of you guys

Corner tape should be installed prior to flashing the sill

Can't fail with this video. I always wondered why it was so drafty near the windows. 😊

Shane, you’re supposed to laugh at the bosses’ jokes, buddy 😅

always , always , always ! , thanks , that will stick with me now !😮 , excellent footage on How To

How do you caulk/foam/insulate the window on the inside after you have it set like in this video?

Thanks for showing me that little batwing trick in the corner. I'm going to remember that one.

Thanks I have seen so many not do this step.

Thanks for sharing such a simple and effective way. I watched some other videos and they tape the entire opening then caulk and install window then retake with sill open. 🤷🏻‍♂️🤦‍♂️ such a waste of money for the same air and water tight results.

I like that awesome is looking creatively at balancing costs time quality and endurance. I think many windows we see on utube are over flashed- of course if you are spending 1,000mplus on some houses/sites (you know who I’m talking about) spending $60 on materials let insuppose makes sense .

How is the sill sealed to the framing? You’re not taping the bottom nailfin. Are you caulking the back of the bottom nailfin when you do the others? Thanks for the info!

So a couple bought my grandparents home and they want to seal the windows. The house is over 100 years old and I have been helping them restore it, that will be key when we get around to that

Wow! Am I over flashing zip wall systems? this is exactrly how I flash regular typar homes, but on zip systems I was taught to flash the entire opening. Top, sides, and bottom, and bring the tape from the outside all the way flush to the inside. Tons of zip tape(which isn't cheap).

Always always always!!! Great video!

Nice, low-cost, quick-to-install flashing detail. I presume you use sealant/backer rod for interior air sealing? If so, what sealant do you use? Do you slope your sills 5 degrees or don't you find that necessary?

Got start with the corner. Piece and them lay the bottom tape.

I'm trying to learn how to do this so I have a couple questions if you don't mind answering them. You first put the flashing tape on the sill and up the sides, then you followed with flex tape on those bottom corners. Why not put the flex tape in those corners then put the tape over that on the sill/sides? Seems like that would be the better way to shed water if it got in and ran down the sides. My second question is why not tape all the way up the sides and the top of the opening? Wouldn't that be a good idea to prevent any air that gets behind the window from making its way into the house? I know that some people don't put sealant on the bottom flange of the window so that any water that gets in can escape (not sure if you did that here or not) but if you did and the window has a great seal to the sheathing then I guess I can see why you wouldn't need to run tape all the way up the sides and across the top.

does anyone know if the bottom of the window should also be flashed? I just had some windows put on and the framers put zip tape on all 4 sides on the outside flanges

I really want some of this but in the uk its 400 quid, gutted because I can't find anything similar to fix a leaking summer house

For the corners I would first place the 6” down in each then the roll all along.

We bought a house and didn't realize that it wasn't wrapped or flashed until the floor near a window seemed wet. Is there a way to remedy this without removing tearing vinyl siding?

Wait you got Shane to smile ha ha .

Very nice

Do you caulk the bottom nail flange?

Great video! Why do you put the zip tape on the inside of the window for the bottom section? Why not the outside like you did for the top and sides?

Missed a couple screws on the side bud!

What would you do here if you didn’t have the stretch tape available for the bottom corners?

Thank you

I don’t know, I like to do my windows like you do a skylight. Not just pee and stick on the framing waiting for caulking to fail. Then water gets led inside (but at least the framing is protected?) leaving the insulation and interior sheathing waiting for doom. All tyvek, blueskin, zip tape, tuck tape etc etc people wrap the framing and not seal the windows….

Do you also tape the top corners or no?

Why don’t we use pressure treated wood for our sills??

What about aluminum flashing on top of the window?

I don't flash windows anymore. Since my neighbor complained. 😂😂😅😅

Thank you! What screws did you use for installing the window? Also, I saw you measure the diagonals from corner to corner, how could you change that if it were off?

Great video! Quick question. You mentioned in one of your reply’s you seal the window along the bottom in the inside as to direct water out the front where nail flange is. What product do you seal it with? And is the the same product you used along the top and side nail flange prior to installing? Appreciate all the insight and time you guys spend on these videos! Cheers.

How come you cut the initial zip tape instead of just stretching that piece over the corners?

Great Video. As a new soon to be home owner(new build). I want to know about some standards. I see you used the stretch to overlay the corners (which were cut with zip tape), to prevent water intrusion. 1)Is it better or safer to just use the stretch period instead of overlaying, as this would provide better integrity? 2)Also, I see you did not put zip tape around the perimeter of frame before you installed the window, is this minimum standard ? Is it overkill if you did or just a peace of mind thing??? 3)Also , is there a minumum overlap of tape on bottom of sill required.??

The flashing on the bottom is not supposed to be fully installed until the stucco lather comes and ties in the house rap underneath the bottom flashing. 😢

But did you caulk the bottom of the nailing flange?? I know you definitely caulk sides and top with continuous solid bead… also if it’s a no flange window would you caulk the bottom?? I thought it was a no caulk on bottom to allow for drainage, but so many conflicting videos by so called experts…

What brand windows do you prefer to use?

Isn't that lower left screw a little close to the corner?. I also didn't see any screws on the head of the window?. Jumped the gun there my friend.

I always wondered why not tape the bottom of the window. You calk all around. If the window is sealed ,air tite then where would potential water come from.?

How often do you roll the tape ?

Do you install any kind of z flashing over the top of the window here?

Not done correctly..... Corner should been first....

You did not fasten the head flange, any reason why?

How would you do this if your house is wrapped, say tyvec. Same way?

At 1:18 you damaged the integrity of the zip board by cutting your flex tape on it… Also at 2:30 do not caulk the bottom flange of the window

No metal flashing?

Do you caulk behind the bottom flange too?

fastener? what kind?

The stretch tape pieces should have been first, then the standard tape

and then the siding guy comes behind you and puts a hole straight through that

Are you caulking the back of the bottom flange?

That tape on the bottom flange bothers me. I think the bottom should be left open in a few places, to allow water to drain if it somehow gets in there. That's why sloped sills are often incorporated into modern windows.

Please share the 'strechy' corner product name/manufacturer

Come on Shane don't just stand there!

Pay attention SHANE

Did I miss something? Was there any adhesive or caullking used? Edit. They did caulk. I am having windows installed right now

Remember the Zip system counts Entirely on the tape been installed properly and in Dry weather conditions , clean Sheathing . I put the odds on that happening at about 20% in todays market. Stick with your Tyveck if you want a good vapor barrier and to increase your odds on having a good job. I put House wrap odds at about 78% to get installed properly .

And the paper goes over the bottom flashing? That would be like starting your shingles at the top of the roof. This is not correct not even close. Unless of course at Green plywood is supposed to be waterproof?

Gussets should go on first

U didn’t even tape the top inside the window

You did what do my window?

Wrong, tape the corners first

Kinda sounds like Mark Wahlberg.

Should be nailed hence the name ‘ nailing flange’

Pop a piece of clapboard on the sill so it has some pitch, then get you some tyvek flex wrap an seal that hog up.