Paste the wall. Use a brush for the corners and a wide medium pile roller for fast application, then simply apply the dry wallpaper and cut excess. __Roll Coverage__ You should always achieve 3 drops per roll (even with pattern matching) at normal ceiling heights 2.4m (8ft). 3 drops at .5m is 1.5m (5ft) wide of wall per roll. It is possible to achieve 4 drops per roll if there is no matching (plains or stripes) and minimal waste. That’s 2m (6ft8in) wide of wall per roll.