Properly Insulating A Crawlspace - Building & Construction - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 02-01-2010, 11:59 AM   #1
newer than a newbie...
 
Join Date: Mar 2007
Posts: 134
Rewards Points: 83
Default

properly insulating a crawlspace


Hi All.

I am planning on insulating my crawl-space, and from reading previous posts, it is a crawlspace (basement area) where it's relatively dry, an extension of my basement and I can store things there. The size is 4' high and the length of the crawlspace is about 20' x 15'

It has never been insulated though and it has bare concrete walls. So, I live in Toronto, Canada, and we paid money for a energy inspection and the report stated that the crawlspace insulated will help in warming up the room above it which is the family room.

This is my plan (as suggested by home depot - yeah..not sure if that's the right advice)

Frame the wall with 2x4s, 16" appart, drill the bases to the ground...and insulate with the batts of R12 insulation. Then, after the insulation is done, cover everything up with Vapour barrier...

So, in essence, right against the concrete wall the studs, then the insulation and cover the inside part of the basement with the vapour barrier.

Is this the right way to go? I got a bit of a lecture from the home depot guy that said that I should put a vapour barrier right against the concrete, but I knew that wasn't quite right...I always thought the vapour barrier goes on the extreme inside of the living space...to keep the moisture out...

Anyways, any opinions/advice would be appreciated...

Thanks

Advertisement

mcvane is offline   Reply With Quote
Old 02-01-2010, 12:35 PM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

properly insulating a crawlspace


Normal wood is not supposed to be up against concrete/block
Best bet is rigid foam up against the block
You could go with thinner R3, then build your wall

Or some people just use 2" thick R10 rigid without a wall
Depends upon the area, what you need, if critters can get in there to chew on the insulation
My last house had 1" insulation installed aroudnthe perimter
But the floor of the house was also insulated

Is the floor dirt...concrete ?

Advertisement

Scuba_Dave is offline   Reply With Quote
Old 02-01-2010, 01:18 PM   #3
newer than a newbie...
 
Join Date: Mar 2007
Posts: 134
Rewards Points: 83
Default

properly insulating a crawlspace


...The floor is totally concrete...no gaps or crevices in the corner or anywhere. Built pretty well it appears.

Maybe I should put that black tarp type material against the floor/wall where I drill in the holes for the wood?

Or maybe i need 2 sets of vapour barrier: One against the concrete, put the 2x4 studs and insulation in between and then have another layer of vapour barrier on the inside?

Maybe it's overkill?
mcvane is offline   Reply With Quote
Old 02-01-2010, 01:54 PM   #4
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

properly insulating a crawlspace


Is there a vapor barrier on the outside of the block - the tar like stuff ?
Scuba_Dave is offline   Reply With Quote
Old 02-01-2010, 02:08 PM   #5
newer than a newbie...
 
Join Date: Mar 2007
Posts: 134
Rewards Points: 83
Default

properly insulating a crawlspace


I assume there is a vapour barrier on the exterior wall.

The reason I can say this is that in the crawlspace which is 4 feet in height, there is a part where wood beams have been installed by the builders and I see an overlap of the tar type black sheets on top of the concrete where the wood was screwed/nailed into place.

I think this house was well built, but we moved in about 2 years ago.

I hope that makes sense?
mcvane is offline   Reply With Quote
Old 02-01-2010, 09:56 PM   #6
Registered User
 
Join Date: Mar 2009
Posts: 9,993
Rewards Points: 2,052
Default

properly insulating a crawlspace


http://www.buildingscience.com/docum...Insulation.pdf

http://www.buildingscience.com/docum...gs?full_view=1

"Or some people just use 2" thick R10 rigid without a wall
Depends upon the area, what you need, if critters can get in there to chew on the insulation" ------------- You need to cover foam board in your case: http://www.icc-es.org/reports/pdf_files/NES/Ner699.pdf



Be safe, Gary

Advertisement

__________________
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
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
Crawlspace Moisture - Serious Problem PaoloM General DIY Discussions 11 12-15-2009 02:35 PM
Insulating an unheated crawlspace indignatz Building & Construction 7 10-28-2009 07:29 PM
Insulating a finished attic properly? kokanee123 Roofing/Siding 13 09-18-2009 10:48 PM
crawlspace exposed to outside and damp djbauda Building & Construction 5 07-30-2007 08:49 AM
Insulating duct run in vented crawlspace Magus HVAC 2 11-29-2006 04:09 PM




Top of Page | View New Posts