#7 Like the look, but tagline should be Fire Retardant Treated Wood.
I also like the combination of the "bubbles" and the flame on the "D." Not only does that work as water, but also as the pressure treatment process of "forcing" chemicals into the lumber during treatment.
#25 Very nice. Though the blue made sense, I think the marketplace expects red.
The main issue now is the font. The current logo is all caps, and I think as a construction "building block" type of product, the font works better if it contributes to the impression of solidity or a foundation.
#28 Design is great. Font is better, but I think a font with sharper edges is needed. The "Z" looks like a "2" and the rounded edge on the "L" and "A" soften it a bit too much.