Type of fabric for a Tarp?

[TMJess]

I am looking at two different fabrics in which I would like to make a cat-cut tarp. I suppose that I would have to treat either of these options to make them more waterproof/resistant.

Option 1: just says 100% POLY (it feels similar to the ripstop-Nylon without the ripstop)

Option 2: 100 % Nylon (Rip-Stop Nylon)

both seem similar in weight (neither package clearly states weight). I would assume that I would need to treat both for rain protection.

I guess I just need help from the fabric gurus! Thoughts or suggestions?

[Dblcorona]

Personally, I would order this. http://www.backwoodsdaydreamer.com/a...s/show/1820961
Silnylon is silicone impregnated nylon for water proofness. It's light, already coated so you only need to seal the ridgeline hem.

[jeroldharter]

Personally, I would order this. http://www.backwoodsdaydreamer.com/a...s/show/1820961
Silnylon is silicone impregnated nylon for water proofness. It's light, already coated so you only need to seal the ridgeline hem.

Ditto. I don't sew, buy Silnylon is great material for a tarp. The 1.1 oz stuff is very strong and lightweight. Completely waterproof. That look like a good price too.

[TMJess]

thank you both for the response, but this stuff is under $1 per yrd and even if i treated it I would be under 1/2 the price of the sil (I agree better option). hard to pass on this at the price.

i guess i should re-phrase my question. if you had to pick from these two which would be the better option?

[wwk10]

Under $1/yd?
I'm drooling.

[Dblcorona]

Then I would go with the ripstop and do a diy silicone treatment for it.

[PDA]

Interesting experiment. The nylon will stretch some, and will stretch when wet, so difficult to maintain a taut pitch. The Poly is probably polyester, which is much more dimensionally stable. This might mean that instead of "giving" in a gust of wind (as the nylon would do) it could rip instead. AT those prices I would be tempted to do both and compare. Are you intending to waterproof using silicone or polyurethane?

[TMJess]

I think i will waterproof with Silicone

[justradar]

let us know how it turns out

[wildcrafter]

for that price buy both make 2 and test which is better. anyone ever try to diy sil polyester?