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-   -   Crawl space and insulation.. (http://www.diychatroom.com/f19/crawl-space-insulation-172439/)

valcarmo72 02-19-2013 08:31 PM

Crawl space and insulation..
 
I have a crawl space that is approx 15x20. Currently the insulation is exposed in the above beams and is starting to hang down. Looks like cotton candy..for lack of better terms...and I wanted to replace it. I was wondering if there was a way to keep that from happening. The space is not heated of course and the is plenty of ventilation. I was thinking a thick plastic staples up to the beams to hold it there and possibly sealing off the above cavities...and proper textbook way to insulate in between the beams and keeping it from having sagging fibers...thanks in advance for the help.....

kaschmid3 02-19-2013 10:22 PM

They make little metal rods(sorry forget actual name) that are wider than bay that u arch up into the bay to hold up the insulation

valcarmo72 02-19-2013 10:27 PM

Those are already in place. That how the insulation is being held up. The insulation doesn't have waves in it its just the fibers are stringy now and I almost looks like someone was pulling cotton candy. Sorry only way to describe it...I read 3mil plastic sheeting to keep out moisture..maybe the fluctuation in humidity is doing it. What really wanna know is what is the best way to insulate a crawl space using fiberglass for the joists....the rods hold it in place but what else....Thx again

jklingel 02-20-2013 01:21 AM

ouch. tear that crap out and replace it with Roxul and rigid foam on the bottoms of the floor joists. tape the edges/ends of the foam and install a 6 or 8 mil visqueen vapor barrier on the floor. search here; lots of threads on insulating crawl spaces.

itsreallyconc 02-20-2013 06:04 AM

thinking of tiger teeth ? you could always staple mesh fabric to hold the f/g in place,,, 6mil's popular 'cause apron/vest stores sell it cheap & those stores are EVERYWHERE :yes: IF you want a decent vapor barrier that will stand up to crawling/duckwalking/scootching w/o ripping/tearing/shifting, find something substantial,,,we use stego (no financial interest),,, might be overkill but no client has yet complained when we demonstrate its superiority over 6mil stuff :thumbsup:

valcarmo72 02-20-2013 07:46 AM

Just saw the Roxul video on their website...defintanelty switch out the fiber for this stuff when its gets warmer. Mold and Mildew resistent. What better can you ask for in a crawl space...thx for the help

jklingel 02-20-2013 01:05 PM

stego wrap is 10x what 6 mil visqueen is; very tough stuff. it costs much more than visqueen, and for a reason. i'd use it in a heartbeat.

itsreallyconc 02-20-2013 05:37 PM

just found out we're got a condo crawl space to fix so will do that after the fl trip :thumbsup: 6mil's in there now + f/g,,, we were the highest $ but the 2 other bidders said they'd use the 6mil again :furious: will grab up some stego & tiger teeth then be outta there in 1 day :thumbup: after all, SOMEONE's gotta pay my greens fees, right ?:laughing:

Dave Sal 02-23-2013 08:40 PM

Here is a link about venting crawlspaces. Might make you reconsider your plan.

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


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