richard,
Checking data on pvc, apparrently schedule 40 is often, but not always
white.
Best is to just ask for schedule 40 and forget the silly colors! They ain't
no use to us bats anyhow <GRIN>

On placement of the antenna flat on the roof, if there is any metal content
in the roof structure, this may mess up the antenna. I might suggest raising
it off the roof a few inches if you can figure out how. Of course you want
it at least minimally fastened down in case of wind.

since It won't be having to hold its self up, I don't see you need
reinforcement.

Tom WA6IVG

On Sun, Nov 08, 2015 at 09:46:41AM -0800, Richard B. McDonald wrote:
> Hi Tom!
> 
> thanks for this.  Right - "Schedule 40" PVC it shall be!  Incidentally, is
> it grey?  Someone said to use the "grey" PVC for its UV resistance; and
> another member of this list said to avoid the "black" PVC for its carbon
> content.
> 
> As far as placement of the loop, I am planning just to place it atop my
> shack's roof.  The roof is flat with a ~3% slant, and ~13' high.
> 
> 73,
> Richard KK6MRH
> 
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Tom Fowle
> Sent: Saturday, November 07, 2015 5:44 PM
> To: [log in to unmask]
> Subject: Re: Using PVC as a Frame for My 10M Full Wave Loop Antenna
> 
> richard,
> To clarify another post, you need to use "Schedule 40" pvc which is U.V.
> resistant.
> 
> I'd think each segment of your loop won't be much more than 2 meters long.
> I'd kind of doubt you'll need reinforcemment  for that relatively small
> setup, but you could also use a few extra rope supports depending on how
> you're going to support the loop.
> 
> There shouldn't be any; issue with running the wire inside the pipe, except
> kind of a tangle while assembling everything on the long wire.
> 
> How do you plan to support the loop?
> 
> Tom Fowle WA6IVG
> On Sat, Nov 07, 2015 at 05:14:52PM +0000, R Bernstein wrote:
> > Use uv-resistant PVC.  Reinforce it inside with wooden dowels or 
> > possibly 3=
> > /4 inch PVC.
> > 
> > 73, Rick W3GWU
> > ________________________________________
> > From: For blind ham radio operators [[log in to unmask]] on 
> > beha= lf of Richard B. McDonald [[log in to unmask]]
> > Sent: Saturday, November 7, 2015 9:11 AM
> > To: [log in to unmask]
> > Subject: Using PVC as a Frame for My 10M Full Wave Loop Antenna
> > 
> > Hi!
> > 
> > 
> > 
> > So, I am planning to make my RX only 10M (28.4 MHZ) full wave loop 
> > antenna into an octagon shape.  My wire is insulated 14 gauge stranded
> copper wire.
> > I intend to use ~1.0" diameter PVC pipe for a frame.  About PVC pipe, 
> > does it matter if I 1) put the wire inside the pipe or 2) tape it to 
> > the outside of the pipe?  I prefer putting the wire inside the pipe.  
> > However, are ther= e any RF interference issues with PVC?  Also, I 
> > wonder how PVC will hold-up t= o the elements - particularly UV light 
> > (sunlight)?
> > 
> > 
> > 
> > 73,
> > 
> > Richard KK6MRH