cost? ~$50 give or take
Step 1: What you need...
so i had an idea, i went to harbor freight and found a 10x12 mesh tarp for about $25. they sell these other places too just check by the normal tarps. it claims to block around %70 of the suns rays...
i drilled a hole near the end of all 4 of them at one end, and put an eye bolt in it for anchoring points.
parts i used
snap on straps for 1" emt conduit - buck or two a bag of 4
medium sized turnbuckles for tensioning the tarp tight - dollar somthin each
carabeaners - $1? each
4 eye bolts - dollar somthin each
some extra 5/16 nuts and washers for the eyebolts - $2
container of spax 1 1/4 screws - $5? i like these because they require no predrill and have nice deep threads for grabbing crappy wood like my deck is made of.