Unless you have any major concerns regarding cracks etc with your property try not to worry about it, if you do have concerns get your own independant survey done first , dont let anyone frighten you into any work on your house. :wink:
Just standard 4" nails will do , your wall plate should be bedded on a cement mortar. The nails act as a tempory fixing for the instalation of trusses rafters etc to stop the plate from moving while installing these. you will then of course need to use special wall plate straps available from b...
have a look for telescopic air vents in your builders merchants once you have seen them you will have a good idea on how to fit them they are the standard modern norm for new builds etc .
