by P.J. DE WET, 27 July 2012
I built a double garage and workshop with Duranco concrete blocks and found the blocks very user friendly and of extreme quality both with regards to sizes and high content of cement. The hole runs through the cenyer of the block allowing reinforcing bars ans concrete to be poured into the cavity, making the wall virtually indestructable and never cracking. Cost is not a factor for this suberb product.
P.J. DE WET