Retro Flashing Commercial Windows - Carpentry - Contractor Talk

Retro Flashing Commercial Windows

 
Thread Tools Search this Thread Display Modes
Old 04-02-2020, 01:05 PM   #1
Registered User
 
Ohio419's Avatar
 
Trade: Remodeling
Join Date: Apr 2020
Location: Toledo Ohio
Posts: 3
Rewards Points: 6

Retro Flashing Commercial Windows


I could really use some help on this one so any input will be appreciated. I'm working for a General Contractor on a commercial project. He's a good guy, pays well, but not the most knowledgeable. He's asked me to install vertical wood siding. The windows and doors have been installed. They're open back aluminum frames. They all extend proud of the wall face by 3/4". It seems like someone had the idea that the frame could be used as a flange. Rainscreen will be Cor-a-Vent Sturdi Batten which adds 7/16". There's no flashing. Some of the Tyvek is tucked in, some is just cut. I can see gaps as large as 1" in the rough opening. Other openings are tight. Lots of spray foam insulation in place. The building interior is finished. I have experience with Dupont's Flexwrap but there's no way to get it into the jamb ( some spots yes, but most no). Removing the windows isn't an option. I'm thinking bending up some aluminum is the only option?
Attached Thumbnails
Retro Flashing Commercial Windows-window-all.jpg   Retro Flashing Commercial Windows-window-close.jpg  
Ohio419 is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 04-02-2020, 01:20 PM   #2
diplomat
 
Golden view's Avatar
 
Trade: Yeah, well, that's just, like, your opinion, man
Join Date: Feb 2012
Location: PDX
Posts: 5,194
Rewards Points: 1,322

Re: Retro Flashing Commercial Windows


Peel and stick very carefully applied to the 3/4" aluminum, with heat and roller if needed to be sure there is a very good bond. What's the trim detail? Can it be rabbeted over the aluminum fast at least 1/2" and caulked to the aluminum? That plus Z flashing above the trim and you have 3 levels of mediocre protection.

Advertisement

__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
The Following User Says Thank You to Golden view For This Useful Post:
asevereid (Yesterday)
Old 04-02-2020, 01:41 PM   #3
Registered User
 
Ohio419's Avatar
 
Trade: Remodeling
Join Date: Apr 2020
Location: Toledo Ohio
Posts: 3
Rewards Points: 6

Re: Retro Flashing Commercial Windows


Thanks for the reply! I like it and appreciate the help.
Ohio419 is offline  
Sponsored Links
Advertisement
 
Old 04-02-2020, 02:19 PM   #4
Pro
 
VinylHanger's Avatar
 
Trade: I'll do that for 500 bucks.
Join Date: Jul 2011
Location: Oregon
Posts: 10,357
Rewards Points: 12,304

Re: Retro Flashing Commercial Windows


I's do what Golden view said. I would also fill the gap with caulk first. Before filling, I would run a strip of sticky flash onto the vapor barrier and as tight to the frame as possible. This gives you a good place to run an exterior bead before sealing them up with the trim.


You are just going to be able to try and mitigate water intrusion as much as possible, not stop it. You want to keep it to the outside as much as possible.

Using 2x trim material will give you enough thickness to rabbit out a cap to set over the rim. On the tops of the frames themselves use an aluminum flashing and on top of the trim do the same with sticky flash taped over both.

Also, make sure you use a good caulk, like QuadMax at every joint and change in trim direction, as well to fill the gaps. I wouldn't use any water based caulk in this instance. This isn't the place to save money.

Also, I would make sure that your contract says you aren't responsible for water intrusion or failure due to previously and improperly installed windows.

How does the window supplier want you to flash and seal them. I would call them and see what they say first.
__________________
Your emergency does not constitute a problem with my Constitution.
VinylHanger is offline  
The Following User Says Thank You to VinylHanger For This Useful Post:
Golden view (04-03-2020)
Old 04-02-2020, 02:19 PM   #5
diplomat
 
Golden view's Avatar
 
Trade: Yeah, well, that's just, like, your opinion, man
Join Date: Feb 2012
Location: PDX
Posts: 5,194
Rewards Points: 1,322

Re: Retro Flashing Commercial Windows


Let others weigh in too. Often someone has a better idea than me.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
Old 04-03-2020, 07:01 AM   #6
Registered User
 
Ohio419's Avatar
 
Trade: Remodeling
Join Date: Apr 2020
Location: Toledo Ohio
Posts: 3
Rewards Points: 6

Re: Retro Flashing Commercial Windows


I think I understand. I did a quick head detail. Not to scale but close. So you're saying two layers of flashing right? Basically a double drip cap?
Attached Thumbnails
Retro Flashing Commercial Windows-flashing-detail.jpg  
Ohio419 is offline  
Old 04-03-2020, 08:14 AM   #7
Pro
 
Randy Bush's Avatar
 
Trade: Exterior Remodeling
Join Date: Mar 2011
Location: Great Falls, MT
Posts: 5,779
Rewards Points: 2,258

Re: Retro Flashing Commercial Windows


Given some of the gaps are up to an inch I would not fill that with caulk. Rather use a foam backer rod or possibly spray window foam to fill . Also flash under the wrap at the top.
Randy Bush is offline  
The Following User Says Thank You to Randy Bush For This Useful Post:
Golden view (04-03-2020)
Old 04-03-2020, 08:56 AM   #8
diplomat
 
Golden view's Avatar
 
Trade: Yeah, well, that's just, like, your opinion, man
Join Date: Feb 2012
Location: PDX
Posts: 5,194
Rewards Points: 1,322

Re: Retro Flashing Commercial Windows


Quote:
Originally Posted by Randy Bush View Post
Given some of the gaps are up to an inch I would not fill that with caulk. Rather use a foam backer rod or possibly spray window foam to fill . Also flash under the wrap at the top.
With backer rod some of the caulks work fine with huge gaps.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
The Following User Says Thank You to Golden view For This Useful Post:
Randy Bush (04-03-2020)
Old 04-03-2020, 11:46 AM   #9
Pro
 
VinylHanger's Avatar
 
Trade: I'll do that for 500 bucks.
Join Date: Jul 2011
Location: Oregon
Posts: 10,357
Rewards Points: 12,304

Re: Retro Flashing Commercial Windows


I wouldn't put the venting under the trim, just the siding.

What is the venting? Or is that your rainscreen?

I'd use backer rod as well. Just figured it was obvious if the guy is a contractor.

Sent from my SM-N975U using Tapatalk
__________________
Your emergency does not constitute a problem with my Constitution.
VinylHanger is offline  
Old 04-03-2020, 12:39 PM   #10
diplomat
 
Golden view's Avatar
 
Trade: Yeah, well, that's just, like, your opinion, man
Join Date: Feb 2012
Location: PDX
Posts: 5,194
Rewards Points: 1,322

Re: Retro Flashing Commercial Windows


Your detail seems OK but I was describing having the rabbeted trim tight to the aluminum and caulked to it. Though, it's true that that doesn't allow water out.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
Old 04-03-2020, 02:14 PM   #11
Pro
 
Randy Bush's Avatar
 
Trade: Exterior Remodeling
Join Date: Mar 2011
Location: Great Falls, MT
Posts: 5,779
Rewards Points: 2,258

Re: Retro Flashing Commercial Windows


I would really consider not using a wood product for trim board. I would Boral or a PVC trim board.

Advertisement

Randy Bush is offline  
The Following User Says Thank You to Randy Bush For This Useful Post:
Golden view (04-03-2020)



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?