Shading Greenhouse

It doesnt seem that expensive Walnut. I have an 8x6 greenhouse so how much of the alu stuff do you think I would need?

 

Of the 2.1mtr wide stuff one side of your roof would need 3mtrs if your doing both sides obviously 6mtrs I find the 50% reflective ideal,I removed the bubble wrap this week and put the shade on some of these sunny days have sent the temperature too high.

 

Cheers Walnut. I intend to grow peppers and toms througout the summer in my greenhouse so will I still need to shade the greenhouse?