Rockwool w/ Coco Mat; Thickness?

I usually run straight rockwool and by the time roots come out of the blocks there is enough shade that they grow everywhere in my tray. However I want to put a mat in the tray and see if this results in better root growth. I will use 4x4 paragro blocks and wonder what thickness would work well?

TBH 1/4 inch is plenty, your roots already go crazy in the tray so this will just help hold a little more moisture for them. Thicker is fine but 1/4" will be plenty. 1/2 inch works well too.

If you make a panda film cover to keep light out and moisture in, you will be surprised how much root growth happens under there.

That sounds good to me, the hps cant get thru a few leaves so a thin mat should be enough to keep it dark and moist for more root area. Thank you.

Pata said:

That sounds good to me, the hps cant get thru a few leaves so a thin mat should be enough to keep it dark and moist for more root area. Thank you.

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Well I have run uncovered and covered, the covered is the way to go for sure but you can grow fine without it. If you try it you won't go back to uncovered.