A roll of wallpaper is generally made with 36 square feet of area. However, a roll, with waste due to cutting and matching, will probably only cover about 30 square feet of wall. Even so, wallpaper can come in various lengths, widths, and square footages. Be sure to check the package when purchasing to ensure enough is purchased.
When papering one wall, determine where the first piece of wallpaper should hang. Mark the center of the wall with a pencil mark. Now, using a roll, mark off widths towards one of the edges of the area to be covered. If the last width is greater than six inches, use the center mark as the guide for the left side of the first roll. If the resulting last width is greater than 6 inches then align your paper so that its center is also on that mark. This will ensure that the pattern is centered properly on the wall. It is more important for larger and more complex patterns.
If you have two windows in a wall that is being papered you also want to be careful about where you begin. Generally, you will want the first roll to be centered directly between the two windows or at least have the sides of two strips meet up in exactly the middle spot.
When papering an entire room, it is inevitable that there will be a point where the edge of two strips meet and they cannot be matched (because the dimension of the room are unlikely to be an exact multiple of the width of your wallpaper). This means you should look for an inconspicuous spot for these two edges to meet. You should not begin at this point, but at the opposite wall. Find a good center-point then work your way to the mismatched spot first one direction and then the other. The inconspicuous spot could be above an entryway where people are unlikely to look, over a window, at an alcove, or where a bookcase is built into the wall (or some other floor-to-ceiling interruption).
Before you begin, take your plumb bob and tack one end to your starting line. Drop the plumb bob down and snap a line. This edge will be where you begin hanging wallpaper.
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