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Polyspan / Silkspan

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Will Moore:
I have built and am currently finishing an Ares.
Which is a lighter covering;  Silkspan or Polyspan?

Ty Marcucci:
Poly  span is lighter, but there are three silk span weights. Poly span takes less dope, based on my experience with it.

Howard Rush:
I have more opinion than experience, but here's my put:  Ares has a lot of ribs.  Silkspan is easy to sand through; polyspan isn't.  One would trowel a lot of dope on silkspan-covered ribs out of sand-through fear.  On polyspan there's merely a temporarily annoying fuzzy or two.  So I think you'd save dope weight with polyspan. 

Mike Quinn:
Hi

Are there different grades of Polyspan.  If so, which is recommended and whats its weight per square ft?

Cheers

Mike

Jim Svitko:
I do not know of polyspan being available in different weights/grades.  I have a package of Thermal Span, same as polyspan, but with no grain.  It is as strong chord wise as span wise.  The data on the package says 0.9 oz/sq yd.

I think Thermal Span is superior to regular polyspan and I would use that if you can still find it.

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