Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-18-2007, 11:55 AM   #1
Newbie
 
Join Date: Mar 2007
Posts: 1
Rewards Points: 10
Default

Question about attic moisture


Hi,
The wife and I put a bid on a new house and we just went through it
with the engineer. This house is a split level, and while checking the
attic crawlspace above the master bedroom, he noticed that the plywood
on the roof looked a little damp and there was mold growing on the
wood. The insulation is blown in and whoever did this never installed
any kind of vapor barrier. Now my questions are:

1) How hard would it be to install a vapor barrier? I know everything
has to be sucked out, then the barrier has to be installed, then new
insulation has to be blown in. This sounds pretty tricky since the
only access is the attic crawlspace and I don't believe the joists
would handle a lot of weight.

2) I don't believe I saw any soffits on the outside of the house.
Would adding soffits and making sure there was adequate airflow in the
attic correct the problem?

I know we're going to be busy taking care of a lot of things when we
move in, so I'm not going to have much time to take care of this
stuff; and I want to get this taken care of ASAP.

Does anyone know approximately how much this would cost to have it
professionally done? We might be able to get this cost taken off of
the offer. Thanks for any help!

Mastershredder is offline   Reply With Quote
Old 03-18-2007, 12:28 PM   #2
Member
 
Darylh's Avatar
 
Join Date: Jan 2006
Location: Nanoose Bay Vancouver Island BC
Posts: 460
Rewards Points: 250
Default

Question about attic moisture


1) How hard would it be to install a vapor barrier? I know everything
has to be sucked out, then the barrier has to be installed, then new
insulation has to be blown in. This sounds pretty tricky since the
only access is the attic crawlspace and I don't believe the joists
would handle a lot of weight.
Vapour barrier can not be put in after the fact ( ceiling finish aready installed).Vapour barrier is installed on the warm side before the ceiling or exterior walls are boarded.
2) I don't believe I saw any soffits on the outside of the house.
Would adding soffits and making sure there was adequate airflow in the
attic correct the problem?
You for sure want to put in soffett vents, there should also be roof vents in as well. You have to have ventalation up there and you are going to want to remove the mold.

Darylh is offline   Reply With Quote
Old 03-18-2007, 01:46 PM   #3
Lic. Builder/GC/Remodeler
 
AtlanticWBConst.'s Avatar
 
Join Date: May 2006
Location: New England
Posts: 7,556
Rewards Points: 2,000
Default

Question about attic moisture


Quote:
Originally Posted by Mastershredder View Post
.....he noticed that the plywood
on the roof looked a little damp and there was mold growing on the
wood. The insulation is blown in and whoever did this never installed
any kind of vapor barrier.
If the plywood is damp = You have a leak on your roof. If it has mold, then it has been leaking for some time now....
How old is the roof? Was the roof visually inspected by someone getting up there and walking around? The proper repair with this is to address the roof leak, not a vapor barrier. See next point...

Quote:
Originally Posted by Mastershredder View Post
.....
1) How hard would it be to install a vapor barrier? I know everything
has to be sucked out, then the barrier has to be installed, then new
insulation has to be blown in. This sounds pretty tricky since the
only access is the attic crawlspace and I don't believe the joists
would handle a lot of weight.
You do not want to install a vapor barrier up there, if there is one up there already. As stated by Darylh, you should already have one facing the warm area. If that is the case, then you DO NOT want to add another one...
See this link regarding attic insulation:

http://www.powerhousetv.com/stellent...577.hcsp#P-4_0

Quote:
Originally Posted by Mastershredder View Post
.....
2) I don't believe I saw any soffits on the outside of the house.
Would adding soffits and making sure there was adequate airflow in the
attic correct the problem?
Does the roof have a ridge vent installed?

If you don't have soffits, then you must not have any overhanging eaves on your roof line.
By the sounds of it...it would be difficult to 'add' soffits without re-framing the roof line.....

If you do infact have a small eave/soffit, you can install small circular or rectabgular vents.
See the link below:

http://www.cornerhardware.com/howto/ht076.html

Last edited by AtlanticWBConst.; 03-19-2007 at 08:45 PM. Reason: Spelling
AtlanticWBConst. is offline   Reply With Quote
Old 03-19-2007, 05:32 PM   #4
Commercial Roofing
 
AaronB's Avatar
 
Join Date: Jan 2005
Location: Illinois
Posts: 927
Rewards Points: 500
Default

Question about attic moisture


I am almost 100% positive that you dont have a vapor barrier, since most products used for this purpose are not true vapor barriers, but vapor retarders.

If the mold and dampness is over largee sections of the roof deck, and it is not leaking when it rains, you may well have a water vapor problem. Key is to determine if it caused from household water vapor or roofing problems.

If you do not have a vapor retarder on the warm side of the insulation (you should be able to tell from the attic space when you remove the insulation), you could remove the existing insulation, and have a 2# closed cell spray polyurethane foam insulation system installed, which isa vapor barrier and air stop at 3" in depth. 5" will give you the R 30 required.

Hope this helps.
__________________
www.roseroofing.net/ Free inspection within 12 miles
Seamless Polyurea Roofing Membranes for Metal Roofing, Roof Leak Repair, Seamless Commercial Spray Foam Insulation, Seamless Commercial Roofing, SPF Roofing, Industrial Insulation, Our trucks are red but our roofing is GREEN!
AaronB 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
Accessable attic & Junction boxes (NEC question) IvoryRing Electrical 7 04-10-2013 10:30 AM
Attic Smell from A/C - I'm at wit's end! cidsamuth HVAC 17 09-06-2008 01:59 PM
I have a question on changing trusses, I am framing an attic room. wackerjr Building & Construction 17 01-22-2008 08:36 AM
Proper Attic Insulation reikiray Roofing/Siding 5 08-04-2007 11:59 AM
Running Romex in the attic mdalli Electrical 7 07-06-2006 06:35 PM




Top of Page | View New Posts

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