rotted

Hello any advise on how to repair those pillar's and prevent future damage ? they are solid oak but are rotting from the bottom up. I was thinking of putting some acrow's then cutting the pillars where the rot is and dig up a hole and fill with concrete and use something like this ? there's...

hi, Bought a house with an extension, there is s strong musky smell from one of the rooms I can’t access this from the loft so have had a look at the roof from the outside. Where the extension meets the house there is a large gap in the tiles. The wood board under neath is rotted. Is this an...