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To work out how much wallpaper you need, divide your wall area by the area of one roll, which should be on the packaging.
Height of room x wall width = number of square metres
Square metres ÷ single roll area = how much you need
Add 10% for cutting waste (15% for large repeat-pattern papers). Most rolls are around 50cm x 10m in length, which equates to 5 square metres.
Check the wallpaper manufacturer's label to see if you will need wallpaper paste to hang the paper. If it is ready-pasted, you only require a wallpaper trough. In some cases you may not need either item as the wallpaper can be selfadhesive off the roll. The starting point is important to establish a balanced pattern. Start near a corner, or, for large pattern papers, centralise the pattern on a chimney breast or centre of a feature wall, for example.
Wallpaper can be applied to any sound, flat wall surface, but some manufacturers may specify lining the wall with lining paper first. Apply as wallpaper, but with no pattern to match!
You should not wallpaper over another wallpaper unless it is stuck down perfectly. Some wallpapers are peelable, allowing you to peel the top layer off, leaving the backing layer to act as a lining paper for the new wallpaper. Again, this is only an option if it is firmly stuck down. Any old, peeling wallpaper surface should be removed before repapering by using a wallpaper stripper.
If painting the ceiling and woodwork, do this first. It is easier to wipe paste off painted surfaces than paint off wallpaper surfaces.
Fill holes in walls with allpurpose filler. When dry, sand smooth, and sand the remaining wall surfaces to remove any rough areas.
An application of dilute PVA or size (dilute wallpaper paste) to the wall before papering seals the surface and allows you to manoeuvre lengths across the surface more easily.
Most common problems are encountered at corners, as most are not precisely 'square' and therefore the wallpaper may crease or be thrown off vertical if you try to round the corner with one length of paper. Follow the guidelines shown here to overcome this problem.
Windows should be treated like a collection of corners. In most cases, where window recesses are shallow, it is possible to bend paper lengths around corners without creasing it, but in this guide it also shows how to deal with corners while keeping patterns level.
Use overlap adhesive anywhere where paper overlaps.
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