When painting and papering a room for the first time, make a note of the quantities used. Next time the room has to be redecorated there will be no need to repeat the laborious task of estimating the quantities.
Finding the vertical for wallpapering
When wallpapering a room, a vertical should be established with a plumb line every time a corner is turned. Start with the wall containing the main window. Use a plumb line to check whether the frame of the window is vertical or not. If it is. Then the first length of wallpaper should be aligned exactly with it.
If. however, the frame is out of square, a guide line will be needed. Measure the width of the wallpaper. Subtracting at least 12mm (more if the frame is far out of square) to allow for trimming. Mark this measurement with a pencil on the wall at a point adjacent to the window frame.
Hang a plumb line from a nail near the ceiling, making sure that the line hangs over the pencil mark. Carefully mark a dotted line down the length of the plumb line. Remove the plumb line and use a straight-edge to join the dotted line up. Use this guide line to hang the first length of paper.
Planning the pasting of wallpaper
When using a cellulose-based paste on a medium or lightweight wallpaper, be sure to allow enough time for the paste to soak into the paper properly before hanging it. Aim to have a pasted piece soaking while pasting or hanging another sheet. Paste one complete length of paper first and put it to one side. Paste another length, put this to one side and hang the first length. Continue alternating between lengths in this way until the entire wall is covered.
Trimming allowances on plain wallpaper
When cutting plain wallpaper. Always allow an extra 50mm 2in on each length for trimming at ceiling and skirting levels.