Drywalling Insulated Basement (additional Insulation Or No?) - Carpentry - DIY Chatroom Home Improvement Forum
Advertisement


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

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

Like Tree1Likes
  • 1 Post By Nealtw
Reply
 
Thread Tools
Display Modes
Old 01-30-2019, 01:54 AM   #1
Newbie
 
Join Date: Jan 2019
Posts: 26
Rewards Points: 2
Default

Drywalling insulated basement (additional insulation or no?)


I'm currently framing my basement which was already insulated by the builder per code (insulated with no frame). Now that I'm framing over the insulation, am I required to insulate again per code or can I just drywall over the frame with no new insulation? Thanks!
Klove1980 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-30-2019, 02:03 AM   #2
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 30,337
Rewards Points: 4,328
Default

Re: Drywalling insulated basement (additional insulation or no?)


Code would be minimum and you likely have what they say is good enough but more never hurt.
That Guy likes this.
Nealtw is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-30-2019, 07:37 AM   #3
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 8,766
Rewards Points: 7,660
Default

Re: Drywalling insulated basement (additional insulation or no?)


What type of insulation is currently installed? Here's a link to help identify it.

But all basements have their own moisture issues and once built that moisture needs to be dealt with. Since the foundation cannot dry to the soil outside it is common to allow it to dry to the inside, no vapor barrier. Once a VB is installed the foundation side will accumulate moisture until it equals the moisture in the soil outside. Allowing drying to the inside may only be a very small amount of moisture but that amount is unknown. If you have the white plastic covered insulation inspect behind it, that at least tells you what is happening today.

Any history of moisture or water down there?

Bud
__________________
I volunteer my help and opinions, but you are responsible for what YOU choose to do with that information.
Bud9051 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-30-2019, 08:02 AM   #4
Member
 
Join Date: Feb 2014
Posts: 4,912
Rewards Points: 4,978
Default

Re: Drywalling insulated basement (additional insulation or no?)


How much of your basement is exposed to the open air.?

After you drywall will insulation be needed.?
ron45 is offline   Reply With Quote
Old 01-30-2019, 12:19 PM   #5
Newbie
 
Join Date: Jan 2019
Posts: 26
Rewards Points: 2
Default


Quote:
Originally Posted by ron45 View Post
How much of your basement is exposed to the open air.?

After you drywall will insulation be needed.?
No. After I FRAME, will insulation be needed?
Klove1980 is offline   Reply With Quote
Old 01-30-2019, 12:46 PM   #6
Siding Specialists!
 
ScottsPainting's Avatar
 
Join Date: Jan 2019
Location: Omaha, NE
Posts: 59
Rewards Points: 118
Default

Re: Drywalling insulated basement (additional insulation or no?)


pics might help everyone give an accurate answer as to what you have currently.
ScottsPainting is offline   Reply With Quote
Old 01-30-2019, 01:00 PM   #7
Newbie
 
Join Date: Jan 2019
Posts: 26
Rewards Points: 2
Default


Quote:
Originally Posted by ScottsPainting View Post
pics might help everyone give an accurate answer as to what you have currently.
Good point. See attached.
Attached Thumbnails
Drywalling insulated basement (additional insulation or no?)-20190130_125618_1548871178102.jpg  
Klove1980 is offline   Reply With Quote
Old 02-09-2019, 08:22 PM   #8
Member
 
Join Date: Aug 2017
Location: NY
Posts: 1,738
Rewards Points: 3,468
Default

Re: Drywalling insulated basement (additional insulation or no?)


hmm maybe a moisture barrier? then DW?

not sure...
__________________
Quote:
Originally Posted by Bud9051
Of course they had already been around for over 200 million years but on a planet that could go for billions of years maybe captain Kirk would have had big teeth and a long tail.
That Guy is offline   Reply With Quote
Old 02-09-2019, 10:27 PM   #9
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 8,766
Rewards Points: 7,660
Default

Re: Drywalling insulated basement (additional insulation or no?)


Where are you located in terms of climate and coded?
When was the house built?
I asked before and no answer "Any history of moisture or water down there?"

As for the foil faced insulation it is most likely a vapor barrier, thus definitely don't add another.
As for meeting codes when built, that may have been the intent but it doesn't look thick enough for current codes, requirements have increased.

From the picture I can't tell if your wall meets the fire blocking requirements, check with your local building department.

Also, the fiberglass insulation stuffed into the rim cavities is an invitation for condensation. There is a recent thread here showing the results.

Bud
__________________
I volunteer my help and opinions, but you are responsible for what YOU choose to do with that information.
Bud9051 is offline   Reply With Quote
Old 02-10-2019, 12:04 AM   #10
Newbie
 
Join Date: Jan 2019
Posts: 26
Rewards Points: 2
Default


Quote:
Originally Posted by Bud9051 View Post
Where are you located in terms of climate and coded?
When was the house built?
I asked before and no answer "Any history of moisture or water down there?"

As for the foil faced insulation it is most likely a vapor barrier, thus definitely don't add another.
As for meeting codes when built, that may have been the intent but it doesn't look thick enough for current codes, requirements have increased.

From the picture I can't tell if your wall meets the fire blocking requirements, check with your local building department.

Also, the fiberglass insulation stuffed into the rim cavities is an invitation for condensation. There is a recent thread here showing the results.

Bud
Sorry I missed this. As far as as when the house waa built, it's a brand new house. Built Nov 2018. Not a lot of history for obvious reasons - new house. It's in Maryland. Thanks for your input.
Klove1980 is offline   Reply With Quote
Old 02-10-2019, 01:37 AM   #11
retired framer
 
Join Date: Jun 2017
Location: Fraser Valley BC Canada
Posts: 30,337
Rewards Points: 4,328
Default

Re: Drywalling insulated basement (additional insulation or no?)


Quote:
Originally Posted by Klove1980 View Post
Sorry I missed this. As far as as when the house waa built, it's a brand new house. Built Nov 2018. Not a lot of history for obvious reasons - new house. It's in Maryland. Thanks for your input.
The rim joist needs some kind of VB to stop warm air from the basement from getting the cold side of the insulation.
Just lately we had a thread here where there was mold behind the fiberglass as well as ice.
https://www.diychatroom.com/f103/fro...joists-652461/


This is what we find here but the foam board is another option.

Last edited by Nealtw; 02-10-2019 at 01:51 AM.
Nealtw is online now   Reply With Quote
Old 02-10-2019, 07:13 AM   #12
Member
 
Join Date: Nov 2015
Location: Maine
Posts: 8,766
Rewards Points: 7,660
Default

Re: Drywalling insulated basement (additional insulation or no?)


Being new with no history leaves the question of moisture open. How is the grade outside, sloping well away from the house, flat, or one sided. Often with new they grade it to look nice but the soil next to the foundation hasn't settled and after it does the rain pools and finds a way in, even when there is a coating of moisture proofing on the exterior.

Your zone I would suspect r-10 continuous or r-13 if cavities only. Being new what is there should meet codes. Framing and electrical may still need to be inspected as part of your permit.

Bud
__________________
I volunteer my help and opinions, but you are responsible for what YOU choose to do with that information.
Bud9051 is offline   Reply With Quote
Old 02-11-2019, 03:50 PM   #13
Newbie
 
Join Date: May 2013
Posts: 2
Rewards Points: 10
Default


I’m doing the same thing you are. It’s a little late now, but you should have ripped out that insulation and did XPS foam. Then XPS cut to size in the rim joists with great stuff around the edges to air seal it then Rockwool in front of it. You absolutely do not want to add any more insulation otherwise you’ll have moisture and condensation issues. Read Building Science articles on the subject and it’ll give good insght.
Attached Thumbnails
Drywalling insulated basement (additional insulation or no?)-94390b71-b5b1-4b0a-ae26-f004dac51ef3_1549918165195.jpg   Drywalling insulated basement (additional insulation or no?)-1155c127-6040-4e75-b23b-873c4a84ac5a_1549918186592.jpg   Drywalling insulated basement (additional insulation or no?)-d40ed825-1694-45af-a5a4-29e2605c5f37_1549918205053.jpg  
Holdmybeer is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
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
Insulation in basement ceiling for soundproofing -- will basement be too cold? jmai14 HVAC 3 11-16-2013 11:04 AM
Insulate rim joist & basement walls- if exterior walls have no insulation? cbrc5eric Insulation 5 02-01-2012 08:47 AM
Basement Ext Wall - Will Rigid Insulation allow my wall to dry inward? COLORADOMTNMAN Insulation 10 01-15-2012 11:09 PM
Yes, Another Basement Insulation Question Beepster Insulation 7 11-30-2011 07:30 PM
basement insulation and vapour barrier coolnes Remodeling 11 02-01-2009 09:56 AM




Top of Page | View New Posts