DINOSAUR, It is all very simple to understand really. All this treated timber, or untreated timber, or bad builders has very little to do with the problem. The problem lies solely with the people that make the rules. The rules up to the seventies never encountered the leaky home problems that we have today. They had bad builders idiot designers, untreated wood, so lets concentrate on what changed. The spanish look was born, thats when the rules changed. We had air tight walls full of insulation like it was the artic circle. That in its self is a great mistake the pressure inside the wall is less than the pressure outside the wall, so that the wall will suck water up hill like drinking with a straw. They still dont know that, that is the problem they run round like headless chooks each blaming the other.If you want a ROLLSROYCE job dont try and do it with LADA parts. If you want a Spanish house build it with blocks the way the Spaniards do not like these clowns on a timber frame. macdunk
PS brick or weatherbrds or nothing