Foam Board + Composite Siding + No Window Flashing

Thread Tools Search this Thread Display Modes
Old 08-12-2008, 03:44 PM   #1
Registered User
KWP's Avatar
Trade: Remodelling
Join Date: Aug 2008
Posts: 1
Rewards Points: 10

Foam Board + Composite Siding + No Window Flashing

This house had double hung aluminum clad wood windows from the 80s. There were moisture problems discovered under some of them during remodeling and it was obvious the sill where the wood meets the aluminum was badly warped from heat or whatever and the weatherstrips were disintegrating, so vinyl replacements were put in on the worst ones.

We then realize that it's not just the window that leaks but the exterior trim. Pulled it off and there was no flashing, just the nail fins nailed to the studs with trim on top.

It is some type of late 80s wood composite siding with foam insulation board directly behind it. The siding actually held up pretty good. There were wood spacers where I guess the foam should have gone up to behind the fins.

Anyway if they opt for new siding what would be recommended here with regards to this foam board stuff? Pull it off? Or just put Tyvek over the top of it?

Secondly, what to do with these replacement windows when the new siding goes on? Are they useless? Obviously the affected sill plate and cripple studs will be replaced because the front of them is rotted.
Attached Thumbnails
Foam Board + Composite Siding + No Window Flashing-wb6tcm.jpg   Foam Board + Composite Siding + No Window Flashing-2dabv2v.jpg   Foam Board + Composite Siding + No Window Flashing-b9j4ol.jpg  
KWP is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. 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!




Old 08-13-2008, 12:01 PM   #2
Registered User
Grumpy's Avatar
Trade: Roofing and Gutter Specialist
Join Date: Oct 2003
Location: Chicago
Posts: 8,573
Rewards Points: 2,000

Re: Foam Board + Composite Siding + No Window Flashing

I always want to pull off old siding.

Add in the fact that the siding was installed over foam board, I would definetly want to pull it off. Add in the fact that all that wood rot exists and I see no other way to properly do the job rather than pulling off the old siding.

Pull it off new weather barrier, new insulation (maybe) and then new siding. make sure everything is properly flashed. This methoid will last the longest althoguh most sidng guys will disagree and say it's perfectly fine to go over what's there with a 1/4" foam board. Sure it'll look good that day but as that composite continues to rot behind the vinyl, what will you do when it starts falling off the home?


Chicago Gutters Chicago Roofing
Grumpy is offline  
Old 08-15-2008, 09:15 PM   #3
softtop95ta's Avatar
Trade: residential contractor
Join Date: Dec 2007
Posts: 140
Rewards Points: 75

Re: Foam Board + Composite Siding + No Window Flashing

Well grumpy's right !!

BUT AT LEAST THE BATHROOM HAS A GFI!!!!!!!!!!!!!!!!!!!!!!
To announce that there must be no criticism of the president or that we are to stand by the president right or wrong is not only unpatriotic and servile but is morally treasonable to the American public....... Teddy Roosevelt
softtop95ta is offline  
Old 09-13-2008, 09:53 PM   #4
Registered User
clapboard's Avatar
Trade: exterior retrofitting
Join Date: Sep 2008
Posts: 9
Rewards Points: 10

Re: Foam Board + Composite Siding + No Window Flashing

Wow, never that! The aluminum windows should have been removed. Obvious shoemaker job. The "Leaks" may have been condensed moisture from within the most moist place in the home, the bathroom. Fix it right!
clapboard is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Transitioning drywall with cement board Lone Wrencher Drywall 22 10-29-2013 08:59 PM
estimating guide for windows? Grumpy Windows, Siding and Doors 20 11-26-2010 07:18 PM
Foam Board vs. OSB JimmyZimmier Framing 17 11-06-2010 04:54 PM
Residential Window and Siding Installer Springfield Massachusetts Patrick Help Wanted or Looking For Work 1 04-18-2008 06:10 AM
Window & Siding Installer Wanted Western Massachesetts Patrick Help Wanted or Looking For Work 1 02-11-2008 10:09 AM

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

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for

At 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 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?