Lining or cross lining
Hanging lining paper serves two functions. Firstly, it provides a smooth even-textured surface, hiding any small blemishes which might show through paint or thin wallpaper. This is particularly useful if the walls have had lots of repairs and filling work. Secondly, it is designed specifically to be the perfect base on which to hang wallcoverings.
The rule to remember is as follows: for painting, hang vertically, for papering, hang horizontally.
The reason for hanging horizontally is to ensure that joints cannot line up in the two layers and to provide maximum bonding strength.
Hang as you would ordinary wallpaper.
Use a builders chalk line to mark a horizontal line on the wall, a little less than the width of the lining paper from the top.
Measuring and pasting the lining paper
Measure and paste the first length but fold it concertina fashion on the table. Allow to soak until pliable. (Remember to allow all pieces to soak for about the same amount of time.)
Hanging and smoothing the lining paper
The hanging process is similar to normal papering, but you will be working accross the wall.
Hold the paper in one hand and undo the first fold with the other.
Starting at one end of the wall, align the top edge of the paper with the mark on the wall.
Smooth the paper along its centre, and outwards, to expel any air.
Continue unfolding and smoothing one section at a time.
Trimming the lining paper
Finally, when the whole length is smoothed, trim the ends in the usual way, but trim to the corner, rather than a little beyond as you would for other papers.
Continue hanging lengths below this, butt joining them. It is essential that there is no overlap whatsoever at the joins as these will show though the wallpaper, spoiling the finish.
Small gaps at the joins are not a problem since the final wallpaper will bridge these and they are unlikely to show.
For the top and bottom lengths, the paper will also need to be trimmed at the angle of the ceiling or skirting. Mark with the back edge of your scissors, peel back the paper, trim and smooth back down.
Note that when trimming the lining paper into the corners there should be no overlap. Otherwise, once the finish paper is hung with an overlap, you will have 4 thicknesses of paper, which may be rather noticeable and unsightly.