Never assume that corners of a room are square or completely vertical.
They are often out of line as can be doors and windows. Use a plumb
line to carefully measure the first length. Do not measure at a corner
or next to a door or window. If there are more windows in the room, start
next to the largest one.
It is always advisable to work away from the source
of light, to help diminish any slight overlaps casting shadows and making the
seams obvious from the doorway. It does not matter whether you start from the
left or right hand side of the window. Hold the plumb line and pencil on the
wall at the top and bottom of the system. Use a length of straight wood, long
ruler or spirit level to join the marks. Repeat the process at intervals around
the room. It is sometimes helpful to continue the line you intend using from the
floor to the ceiling, to give a good guide for the first length of paper hanging.
Measure the width of a roll and place the plumb line a roll length from the window
and mark the vertical line. This will give a good guide for the position of the
first length.
If using a patterned paper and there is a central feature to the room (such as a
fireplace), you may want to line up a length directly over the focal point. It
is important to start on that wall at the centre and work outwards towards the
corners of the room. Follow the pattern around the remainder of the room using
the above guidelines, working away from the window, but keeping the pattern in
line with the completed wall.
