Browse Forums Landscape & Garden Design there is only 20% difference in concrete strength between 20 mpa and 25 mpa, so check with your engineer first if it fits his calculation tolerances. There are ways to… 6 18632 i imagine you also have another contract with an architect? and yeah, whatever other's said about special conditions and appendices 16 16671 welcome to learning that colours vary in different lighting conditions. 1 3049 |