Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 06-20-2010, 04:17 PM   #1
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Share |
Default

2nd floor overhang not insulated properly


I have a 2 story home with a 1 foot overhang for the 2nd floor. I was suprised to find a 3' piece of paper faced R-11 looped over itself and stuffed up in the joist space. There are a lot of air gaps.

My solution is to block off the joist cavity with 1 1/2" Rigid foam and caulk all the edges and then add a second piece against the subfloor, isolating the overhang area, stopping airflow and insulating. That will leave me with a 6" space left where I will use fiberglass batt inslation, or Roxul batts.

Pics:



Foam:


mjzraz is offline   Reply With Quote
Old 06-25-2010, 06:48 AM   #2
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Default

2nd floor overhang not insulated properly


Here is what I did. I will be adding batt insulation in the remaining 6" space and covering with building paper or housewrap and then the aluminum.


mjzraz is offline   Reply With Quote
Old 06-25-2010, 11:24 AM   #3
Totally screwed together
 
Join Date: Dec 2006
Location: Cypress, SoCal
Posts: 325
Default

2nd floor overhang not insulated properly


Nice detail work!
xxPaulCPxx is offline   Reply With Quote
Old 06-25-2010, 11:20 PM   #4
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

2nd floor overhang not insulated properly


http://www.buildingscience.com/docum...n-crawlspaces/

Be safe, Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 06-25-2010, 11:27 PM   #5
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,043
Default

2nd floor overhang not insulated properly


Spray foam is a better solution, then the job that you did. It will not even keep the space warm in the winter.
gregzoll is online now   Reply With Quote
Old 06-26-2010, 02:28 AM   #6
Totally screwed together
 
Join Date: Dec 2006
Location: Cypress, SoCal
Posts: 325
Default

2nd floor overhang not insulated properly


As opposed to poorly stuffed bats that he had in before?

Is that scent of troll I smell?
xxPaulCPxx is offline   Reply With Quote
Old 06-26-2010, 07:10 AM   #7
Mod
 
kwikfishron's Avatar
 
Join Date: Mar 2010
Location: Kansas (NCK)
Posts: 7,347
Default

2nd floor overhang not insulated properly


You should be “very concerned” with the exposed sheathing behind you vinyl siding.

If they missed it there then what else did they miss?
__________________
A Picture Is Worth A Thousand Words
Especially In The DIY Chatroom
kwikfishron is online now   Reply With Quote
Old 06-26-2010, 09:15 AM   #8
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,043
Default

2nd floor overhang not insulated properly


Quote:
Originally Posted by xxPaulCPxx View Post
As opposed to poorly stuffed bats that he had in before?

Is that scent of troll I smell?
Only if you have one living under a bridge in your backyard. If the bats where stuffed improperly, two ways that could of happened: 1) Sub paid by the house, and their hired labor ready guys do not know, nor care how to place installation. 2) Prev. home owner did not know how to place bats, and made an attempt to try to stop cold air inflitration.

Spray foam is the proper way to insulate the overhang, not foam board.
gregzoll is online now   Reply With Quote
Old 06-26-2010, 09:30 AM   #9
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Default

2nd floor overhang not insulated properly


Quote:
Originally Posted by GBR in WA View Post
Good read. That link seems to be more specific to the moisture issues in a crawlspace. I will have to explore that website more. Thanks.

Quote:
Originally Posted by gregzoll View Post
Spray foam is a better solution, then the job that you did. It will not even keep the space warm in the winter.
Better, I would agree, but DIY? My foam is tight against the framing and the subfloor. I cut each piece individually for a friction fit and tapped it into place with a block of wood and sealed it with exterior caulk. In the areas with ducts, I taped the joints with metal duct tape and used 1 can each of expanding foam to fill the cavity and surround the duct. I checked from the inside to make sure the vents were not stuck or the duct crushed or blocked. I cut my foam sheets to fit around the duct and sprayed the expanding foam to seal them in.

Before doing the work I could feel cold air blowing out of the joist cavities and where the ducts were, was where I stood outside to cool off while working. The insulation was dirty and haphazardly installed. Afterwards there is no air escaping.

The R value of the foam insulation board is 7.5, I am using a roxul batt in the remaining space which has a R-23 and there is zero air flow and my ducts are sealed. So won't R-30 with zero air flow keep my space warm in the winter?

Roxul: http://www.roxul.com/files/RX-NA-EN/...20Sheet_US.pdf

Quote:
Originally Posted by kwikfishron View Post
You should be “very concerned” with the exposed sheathing behind you vinyl siding.

If they missed it there then what else did they miss?
That's the story of my life with this house. partial list of minimium code or lousy work:
No window and door flashing
no building paper/WRB
Floor joist cut completely through for drain pipe and not braced
2nd floor joist cut for plumbing and "cosmetically braced" (the braces didn't actually touch adjacent joists - wtf?)
Wiring and plumbing penetrations in lower 1/3 of joists
2x8 spanning 14'
3/8 ply on 24" center roof sheathing
mjzraz is offline   Reply With Quote
Old 06-26-2010, 10:00 AM   #10
Newbie
 
Join Date: May 2010
Posts: 26
Exclamation

2nd floor overhang not insulated properly


Looks like your building paper is running vertically, should be running horizontally with positive overlaps (shingled like a roof)
mark2007 is offline   Reply With Quote
Old 06-26-2010, 10:12 AM   #11
Mod
 
kwikfishron's Avatar
 
Join Date: Mar 2010
Location: Kansas (NCK)
Posts: 7,347
Default

2nd floor overhang not insulated properly


Doesn’t even look like building paper to me. I‘ve never seen that stuff before.

Looks like you don’t want to put a cig. out on it.
__________________
A Picture Is Worth A Thousand Words
Especially In The DIY Chatroom
kwikfishron is online now   Reply With Quote
Old 06-26-2010, 10:19 AM   #12
Newbie
 
Join Date: May 2010
Posts: 26
Exclamation

2nd floor overhang not insulated properly


holy just saw the writing on the building wrap. Definetly not the right place for that stuff
mark2007 is offline   Reply With Quote
Old 06-26-2010, 10:41 AM   #13
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Default

2nd floor overhang not insulated properly


It's a fiberboard sheathing from Georgia Pacific.

Not sure if it's the same stuff, but here is their current product:
http://www.gp.com/build/product.aspx?pid=6055

This house is from the early 80's. There is plywood on the corners - I assume for structural support since the fiberboard won't even hold siding nails.

I would like to replace it where I am replacing a sliding glass door and a window. Not sure if 5/16 osb or 1/2" plywood (4 ply CDX) is better...
mjzraz is offline   Reply With Quote
Old 06-26-2010, 11:35 AM   #14
Mod
 
kwikfishron's Avatar
 
Join Date: Mar 2010
Location: Kansas (NCK)
Posts: 7,347
Default

2nd floor overhang not insulated properly


CDX is all I’ll use but 7/16” OSB is cheaper and ok in dry climates.

Which you must be in.

A 20+ year old house with Vinyl Siding and no building paper that isn’t rotted to the core amazes me.
__________________
A Picture Is Worth A Thousand Words
Especially In The DIY Chatroom
kwikfishron is online now   Reply With Quote
Old 06-26-2010, 11:48 AM   #15
Member
 
Join Date: Jun 2008
Location: Maryland
Posts: 59
Default

2nd floor overhang not insulated properly


the siding is aluminum if that matters. I am on the east coast, MD. I think I am convincing myself to go CDX. There is some rot, but it's from the aluminum slider frame and no flashing/sill pan and possibly the old deck ledger contributed as it was not flashed...

I'm using dupont flexwrap for the sills and 30# felt with a self adhesive (undecided on brand) to flash the sides of the new door and one new window. Here's the damage:


repair in progress:

mjzraz is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Tub shower not operating properly Zinger Plumbing 3 02-21-2010 09:51 AM
Insulated Vinyl Siding vs Regular Vinyl Siding DIY828 Remodeling 25 08-06-2009 12:32 PM
Door not closing properly kirridam Electrical 8 12-27-2008 04:26 PM
Pulling wire through insulated walls daxinarian Electrical 11 07-17-2008 01:11 PM
Upgrading can lights to insulated? juliejules4 Electrical 2 12-03-2006 04:25 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.