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Old 01-08-2010, 06:15 PM   #1
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Under slab vapor barrier building procedure



Do I have the pieces numbered in the correct order in which to lay them down ?
For example a roof with a pvc exiting a roof takes a seal on the top side so I was thinking to layer in the same manner to block the moisture from the under side. The #1 black 4 mil is sitting on top of #2 so you can see the size Im cutting the pieces but #1 would actually go on before/under #2. Or does the procedure really make a difference ?
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Old 01-08-2010, 07:34 PM   #2
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tape the edges and the order won't matter.
the poly under a slab is not to stop water from going down, it stops the ground water from coming up, so forget about the roof situation.
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Old 01-08-2010, 07:49 PM   #3
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Thanks jlhaslip I understand that the intrusion is from the underside. I guess I was too concerned about the steps of how they are installed.
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Old 01-08-2010, 11:23 PM   #4
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http://www.100khouse.com/2009/06/24/...b-air-sealing/

http://www.stellarcontractors.com/as...loose_sand.pdf

Be safe, Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 01-09-2010, 01:48 AM   #5
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Reading the loose sand article raises the question of 'how many basement slabs in houses have forklifts?'.
It appears the loose sand article deals with data from commercial projects. ie: warehouses with forklifts causing the cracks.

or did I miss something?
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Old 01-09-2010, 07:28 AM   #6
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Thanks for all the help. I had not planned on using sand in this application but can understand the controversy. As far as sealing the pipes go then it looks as though I might be on the right track.
Thanks again
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Old 01-09-2010, 02:37 PM   #7
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Sorry, I clicked on the wrong one......... http://findarticles.com/p/articles/m.../ai_n25376326/

Thank you for catching that, jlhaslip.

Be safe, Gary
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