Should I Add More Insulation To The Tunnel Of A Skylight? - Insulation - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Insulation

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

Reply
 
Thread Tools Search this Thread
Display Modes
Old 01-01-2015, 10:22 PM   #1
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default

Should I add more insulation to the tunnel of a skylight?


My skylight is forming condensation on the glass and it is dripping to the lowest corner and then making streaks on the drywall. I had the glass replaced since a carpenter said that was the problem. There is still condensation on the window that drips down and drips in my room. The roof ceiling around that lowest skylight side is all frosty and looks as if water iced it. If I put more insulation around the tunnel after the new glass was cauked and sealed in will this fix the problem? Do I need to insulate the roof ceiling around the skylight? I am hoping for any help, since it cost $500 just to replace the glass, which now apparently was not the problem.
nrwilson is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-02-2015, 12:39 AM   #2
Retired Moderator
 
Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 25,728
Rewards Points: 7,174
Default


Yes,Insulate it well---

I had a tall tunnel in a bathroom once---and installed an exhaust fan into it--that was severe--dumb design---

Sometimes--a sheet of clear plexiglass is installed to a tunnel ,at the ceiling--that acts like a storm window---and ends the condensation.
__________________
New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-02-2015, 10:59 AM   #3
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


Yes I had a piece of plexiglass there before the carpenter came and decided that I needed new glass and took it out. It still streaked down the drywall with it in then too. It was not sealed in there completely though because they just pulled it out easily. If I put it back in does it need to be sealed with caulk or what?
nrwilson is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-02-2015, 12:09 PM   #4
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 15,018
Rewards Points: 1,946
Blog Entries: 2
Default


The warm air rises. Any moisture in it will condense on the glass. It takes a really well insulated glass skylight to not have condensation.

What is the RH% in the house?

Insulation is always good. But, if you have a lot of moisture, creating layers is about the only way to fix it.

I've heard of some people have an exterior 'dome' they put over the skylight in the winter to create another layer so as to not have to deal with the plexiglass inside.
__________________
Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is online now   Reply With Quote
The Following User Says Thank You to ddawg16 For This Useful Post:
oh'mike (01-02-2015)
Old 01-02-2015, 04:58 PM   #5
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


So, how do I determine the relative humidity of the house, to see if it is a problem? The furnace has an aprilair and I run a dehumidifier in the basement during the fall to winter months. The tunnel is right in front of the main entrance that has a vented overhang that allows outside air to come in and hit the tunnel directly behind it. Does this have anything to do with increasing the condensation possibility?
nrwilson is offline   Reply With Quote
Old 01-02-2015, 09:50 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526
Default


Welcome to the forum!

Cold chute walls + warm house air = condensation. Either dehumidify or insulate the chute's walls/add house wrap, after air sealing in the attic.http://www.buildingscience.com/docum...bout-diffusion

Gary
PS. Yes, the lower glazing needs to be air-tight to work.
__________________
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?

Last edited by Gary in WA; 01-02-2015 at 09:51 PM. Reason: sp
Gary in WA is offline   Reply With Quote
Old 01-02-2015, 09:59 PM   #7
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


If I put the plexiglass back how far away from the skylight is the best distance to try to stop the condensation? Does it need to be caulked or sealed somehow to make it air tight?
Also do I need any insulation on the roof around the tunnel or something else? It is icing up there on the roof coming off the lowest side from the skylight. Is this because of or from the condensation?
nrwilson is offline   Reply With Quote
Old 01-02-2015, 10:01 PM   #8
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


Thanks for taking time to help a novice at attic repairs! Thanks for your input!
nrwilson is offline   Reply With Quote
The Following User Says Thank You to nrwilson For This Useful Post:
Gary in WA (01-02-2015)
Old 01-02-2015, 10:15 PM   #9
Registered User
 
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526
Default


I'd add the p-glass at ceiling level BUT the chase will still be cold- even with tons of insulation without heat from the room. With the heat is moisture, from people, pets, cooking, showers, washer/dryers, etc. that has to go somewhere. Any pinhole (1/32") is enough to give moisture there. Rigid foam board makes a good air seal for the attic side, if accessible; http://www.finehomebuilding.com/desi...ght-shaft.aspx May also need to be covered with ignition barrier...

No added insulation ON the roof. Gary
__________________
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Gary in WA is offline   Reply With Quote
Old 01-02-2015, 11:04 PM   #10
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


Wow what an education you just gave me with the two links you provided Gary! Thank you! Thank You!! 2 inch Rigid foam around the shaft since I am in zone 6 and the plexiglass on inside. Does anyone know of any qualified and reasonably priced people in Rock County in WI to complete this work?
nrwilson is offline   Reply With Quote
Old 01-03-2015, 01:58 AM   #11
Retired Moderator
 
Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 25,728
Rewards Points: 7,174
Default


You want an insulation contractor--
__________________
New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote
Old 01-03-2015, 08:20 PM   #12
Registered User
 
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526
Default


You're welcome! 98% of the time, I get no response..... glad we could help.

Gary
__________________
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Gary in WA is offline   Reply With Quote
Old 01-03-2015, 11:24 PM   #13
Newbie
 
Join Date: Jan 2015
Posts: 7
Rewards Points: 14
Default


Thanks again for all the pointers from everyone! I really appreciate them! It gave me a solid starting point and direction to go! Thank you!
nrwilson is offline   Reply With Quote
The Following User Says Thank You to nrwilson For This Useful Post:
oh'mike (01-04-2015)
Sponsored Links
Advertisement
 
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
Existing blow in insulation vs new insulation - Keep or redo? Jaxx Insulation 9 01-17-2014 08:26 AM
Several Insulation Quotes, Big Decisions to make knotquiteawake Insulation 2 05-04-2012 11:16 AM
Garage Insulation yamster Insulation 0 07-01-2011 01:30 PM
Rafter Vents and Insulation nofx1981 Roofing/Siding 15 03-10-2010 08:14 PM
Cold bathroom toeey1 Roofing/Siding 5 02-10-2010 07:29 PM




Top of Page | View New Posts