Graham Timmins Oct 24, 2008:

rilla eller ås Fascinating how we see things differently. In the UK we see the ås not the rilla and talk about ridges rather than channels ('groove' is too narrow, I think)! But in any case if you go to buy roofing sheets the choice is between 'corrugated' and 'flat' so I suggest reword the whole sentence - which you will probably need to anyway since 'normal' takplåt as such is little known in the UK. Nobody would ever in a million years ask you whether you wanted your roofing sheets with or without grooves!