Screed boards and Rebar

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Author Message Robin E. Snyder Senior Member Username: robin Post Number: 203 Registered: 08-2004 Posted on Wednesday, August 27, 2008 - 01:13 pm:    When a contractor sets up screed boards with rebar, which penetrates the vapor barrier, what happens when the rebar is pulled - leaving a hole in the vapor barrier? What are alternative methods for setting up screed boards to eliminate this issue? Marc C Chavez Senior Member Username: mchavez Post Number: 324 Registered: 07-2002 Posted on Wednesday, August 27, 2008 - 01:19 pm:    laser screeds or don't worry about it. Those are just about your only choices - that I know of Marc C Chavez Senior Member Username: mchavez Post Number: 325 Registered: 07-2002 Posted on Wednesday, August 27, 2008 - 01:22 pm:    I forgot. A few contractors are placing little metal feet on the pegs that disengage once the concrete is poured thereby NOT puncturing the Vapor retarder and still allowing the use of regular screeds. little feet are often metal tube on small plate with a few tack welds Ronald L. Geren, AIA, CSI, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 665 Registered: 03-2003 Posted on Wednesday, August 27, 2008 - 01:29 pm:    See the article posted on Stego's website: "Don't Puncture the Vapor Retarder" Richard L Matteo, AIA, CSI, CCS Senior Member Username: rlmat Post Number: 299 Registered: 10-2003 Posted on Wednesday, August 27, 2008 - 02:18 pm:    This is what I generally say in my specs: "Do not use screed stakes in areas where vapor retarder is installed. Use screed pads to hold screed posts. Do not pierce vapor retarder." Philip R. Carpenter AIA Senior Member Username: philip_carpenter Post Number: 12 Registered: 08-2008 Posted on Wednesday, August 27, 2008 - 07:40 pm:    does anyone have a link to a specific product for the screed pads that screed stakes would be attached to? seems like a non-metallic product would be better as a left-behind than the metal feet type. we have quite an issue with vapor up thru the slab here in the northwest and are always having to push the contractors to see the issue Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 888 Registered: 02-2003 Posted on Thursday, August 28, 2008 - 08:34 am:    Try "G-3" device from Dayton Superior; also dee Concrete Accessories and C&H Concrete Specialties for variations of what is shown in article Ron noted in the link. Mark Gilligan SE, CSI Senior Member Username: mark_gilligan Post Number: 81 Registered: 10-2007 Posted on Friday, August 29, 2008 - 12:20 am:    My bias is to simply say that they cannot penetrate the vapor retarder. When you get into specific techniques you are unnecessarily getting into means and methods. Knowledge of these devices are useful if the contractor says he cannot comply with your requirements. Ron Beard CCS Senior Member Username: rm_beard_ccs Post Number: 280 Registered: 10-2002 Posted on Tuesday, September 02, 2008 - 04:35 pm:    WR Grace has two Tech Letters that might be of interest: Rebar chairs http://www.na.graceconstruction.com/custom/waterproofing/downloads/tech_letters/WP-015.pdf Prep and Repairs http://www.na.graceconstruction.com/custom/waterproofing/downloads/tech_letters/WP-033.pdf It is interesting to note that for horizontal applications they recommend concrete or brick blocks, pavers, or dobies as rebar supports.