Re: Tyvek ground cloth

yes ... that is the same chart I was looking at ...

Type 10 – Is the stiff smooth paper-like stuff for printing/packaging applications so crunchy... so less than ideal...

Type 16 – perforated for high air permeability so seems a bad plan...

Type 14 – softer fabric-like series, and OF THE 14xx series the 1422A is the only one with the hydrostatic head rating...so that's where I was thinking of going...........

I had an e-mail exchange a while back with Dupont on the topic, but the agent I was working with could not really get his head around the ground-cloth application  ;-/

Jim




--- In [email protected], John Ladd <johnladd@...> wrote:
>
> On Sun, Jun 9, 2013 at 5:50 AM, jrwooden <jim@...> wrote:
> 
> > **
> >
> > ... according to the Tyvek website the 1422A has a hydrostatic head
> > rating, while 1422R & 1433R have no specification so ... likely they would
> > not be as waterproof?
> >
> > Good point - properties chart for the various grades of Tyvek is found at
> 
> From
> http://www2.dupont.com/Tyvek/en_US/products/tyvek_styles/tyvek_styles.html
> 
> [image: Inline image 1]
> 
> And
> 
> "Spunbonded Olefin with neither corona treatment nor antistatic agent
> (e.g., Style 1073B) has a hydrostatic head in excess of 50 in. (127 cm). If
> antistat is applied, the hydrostatic head will drop to 40-50 in. (102-127
> cm). Corona treated and antistated Spunbonded Olefin (e.g., Style 1073D)
> has a hydrostatic head that is less than 15 in. (38 cm)."
> 
> http://www2.dupont.com/Tyvek/en_US/products/product_properties.html#moisture
> 
> 1422R (kite tyvek) has both antistatic and corona treatment (per above
> chart) so hydrostatic head drops from 50 (building wrap tyvek) or less than
> 15 (kite tyvek - 1422R). Maybe 1422A which eliminates the corona treatment
> has the best combination of properties with hydrostatic head of 40 inches.
> Corona treatment (present in 1422R but not 1422A) seems mostly designed to
> allow printing.
>