Viability of adding a roof to an existing deck

I built a deck a few years ago and am considering adding a roof for some shade in the summer/rain protection. The deck is about 12x12, I set 3 concrete pillars 4 feet deep on each side and then used brackets to attach the rim joists. The floor joists are attached to the rim joists with hangers and then supported in the middle with deck blocks. It's not quite ground level but close to it.

My idea is to notch out 6x6's and then carriage bolt them into the rim joists so they are sitting directly over the footings to support the roof. I'm thinking a shed style aluminum roof.

Is this something I should even consider doing, or am I going to drop a roof on my head?

Thanks.

Submitted April 29, 2015 at 09:55PM by endlessmilk http://ift.tt/1DWpsqx