Crawl space problem

[mmojbafan]

Hello everyone...
One of my client wants cover the whole earth of his basement a plastic sheet (some kind of vapor barier).

I know that it will stop the humidity to rise however I think it also block the humidity to scape. I have seen many crawl spaces that actual water stays on the plastic and has no place to go...

Which method would be the best?

Thank you

[Brad Brinke]

Is it a basement or a crawlspace and what area of the world are you in?

[mmojbafan]

It's a crawl space, walkable, not habitable...
We are in Montreal, Quebec, Canada

Thanx

[Robert Ernst]

The plastic in the crawl space is a great idea. Over lap the seams and tape them well. Bring the plastic up the wall some and use acoustic sealant to glue it to the concrete. Then have them use rigid insulation on the concrete. You now turn it into a semi conditioned space. It will now only need 1 sqft of venting for every 1500 sqft. If you were to close all vents I would have a humidistat with an alarm. If there is water on the plastic it's unusually caused by bigger issues.

[Joe Funderburk, CMI]

Originally Posted by mmojbafan

Hello everyone...
One of my client wants cover the whole earth of his basement a plastic sheet (some kind of vapor barier).

I know that it will stop the humidity to rise however I think it also block the humidity to scape. I have seen many crawl spaces that actual water stays on the plastic and has no place to go...

Which method would be the best?

Thank you

Please forgives to be incontinent for interior decoration.

[Barry Adair]

Originally Posted by jfunderburk

Please forgives to be incontinent for interior decoration.

the smoker you drink the player you get

[Joe Funderburk, CMI]

That's Chinglish Barry. Translated it means, if you don't understand the purpose for a vapor barrier, you probably shouldn't be doing home inspections.

[mmojbafan]

Thank you

[Barry Adair]

Originally Posted by jfunderburk

That's Chinglish Barry. Translated it means, if you don't understand the purpose for a vapor barrier, you probably shouldn't be doing home inspections.

glad my mentors showed a bit more patience otherwise i’d still be on the nipple and in diapers
although the prior is still enjoyable
the latter may be in my future
htbh

back to the OPs ?
this may help guide and explain further

[Jeffrey R. Jonas]

Originally Posted by badair

the smoker you drink the player you get

You can tune a piano but you can't tuna fish.

[Jeff Zehnder]

In the southern part of the US a full 100% vapor barrier in the crawlspace would be the correct answer...however as someone who has also lived in the somewhat frozen north
Foundations may be damaged by excessive moisture from frost so I would check further before covering 100% of the ground in a crawlspace in your area. Leaving a small amount of grade uncovered may act a sort of relief valve to prevent damage to brick/block in the event the foundation become to wet and cannot dry.
Ask more experts in your area who are familiar with crawlspace construction in cold climates.

[Roy D. Cooke, Sr]

Originally Posted by badair

glad my mentors showed a bit more patience otherwise i’d still be on the nipple and in diapers
although the prior is still enjoyable
the latter may be in my future
htbh

back to the OPs ?
this may help guide and explain further

Love both .....thanks .... Roy

[mmojbafan]

Thank you Jeff,

It's one of those things that everyone has different oppinions...

[Steven J. Wessler]

Massoud,
Don't let the bullies stop you from asking questions. You will always get the arrogant know-it-all's. There are alot of good people here, and its better to ask then guess.
Barry, I agree, my mentor showed a bit more patience and I still work with him and learn from him. There are those that are Great Teachers and those that can only wish.

[Bill Smith]

Originally Posted by swessler

Massoud,
Don't let the bullies stop you from asking questions. You will always get the arrogant know-it-all's. There are alot of good people here, and its better to ask then guess.
Barry, I agree, my mentor showed a bit more patience and I still work with him and learn from him. There are those that are Great Teachers and those that can only wish.

Good post.