Best Shade Cloth for Domes?

[Happy Salmon]

Looking for some advice on what type of shade cloth is best for covering our 43' dome. We've narrowed it down to 2 options, either 87% Grey, or 70% sandstone. Inside our dome will be the bar, DJ booth, Speakers, Carpeting and Furniture. We want a light airy feel but at the same time want plenty of protection from the sun and heat. So I guess my questions is this: Is 70% shade cloth sufficient to keep the space and ourselves cool, or would we be better suited getting the 87%? I have heard arguments for both, but would really like to hear the opinions of burning man vets!
Thanks in Advance!!

Links for both options:
87% Grey: http://www.catalogclearance.com/products/greyshadecloth__knittedshadecloth.html
70% Sandstone: http://www.sears.com/shc/s/p_10153_12605_SPM1493551301P?sid=IDx20101019x00001a&ci_src=14110944&ci_sku=SPM1493551301

[some seeing eye]

I don't know what your V is and I assume you can climb your dome to install and deinstall. Aluminet is a stretchy shade cloth that is about $.28 a square foot, much cheaper than what you cite. It runs in about 7' widths as manufactured. If you are ordering it, do ASAP. Suppliers like Gothic Arch Greenhouses are slammed near BM.

[Happy Salmon]

Sorry, it's a 4V, and yes we can climb on it. The goal is to cut pieces in a way that doesn't require sewing. We found the 4V dome is really made up of 2 types of triangles, AF:DD:FA and DD:DD:DD (see desert domes assembly diagram) Each of these is just under 12' tall, so we would need a material that is 12' wide. I'll look into large rolls of aluminet and see what I come up with. Thanks for your suggestion!

[Token]

Aluminet and most other shade cloth come in 12' width.

BTW, you dont need to wrap the whole thing. Just figure out the sun azimuth, sunrise, sunset and wrap half of the dome.

US Naval Observatory has all the info you need to figure it all out.

As for the % listed shading, anything over 40% is useful, over 70% is diminishing returns. If you think you need more than 70%, go with plywood.

[some seeing eye]

Aluminet: You can wrap it in strips, overlapping say 6". No need to cut triangles. Because it stretches, it sort of catches on the rough part of the joints, or you can use nylon tie wraps as needed. It's a common dome covering at BM.