Find the square measure of the walls by adding together the length and breadth of room, double it, and then multiply by the height, thus:-
Room 15 ft. x 12 ft., 10 ft. high. 15 + 12 = 27 ft., 27 x 2 = 54 x 10 = square measure. Find square measure of the paper, which is 12 yds. long and
1 3/4 ft. wide, and then divide square measure of the room by the square measure of the wall-paper-
In which case it would be necessary to buy 9 pieces. If the pattern were very large, another piece might be required to allow for the waste involved by the matching of the pattern.
Wall -papers may be bought at greatly reduced prices during the months of December and January, before the new season's designs come in.
It should be remembered that paper harbours dust, dirt, infection, and occasionally insects. This fact renders it essential, for the preservation of health, that all old papers should be stripped off the walls before a new one is put on; thorough soaking renders this easier. Where varnished papers have to be removed a solution of strong soda and water is helpful, but the walls should afterwards be washed with vinegar and water to counteract this alkali, as otherwise the new paper may become stained and discoloured. All holes should be filled up with plaster of Paris, and the walls well rubbed with sand-paper to make them quite smooth before the papering is commenced. If new paint is desirable this should also be applied at this stage.
This is not a long operation unless the pattern presents difficulties. The pieces are 12 yards long and 21 inches wide; so that it is not difficult to calculate how many will be required. On each side of the roll a margin is left of plain paper; this should be removed, and the paper cut into the required lengths. Then brush thoroughly with the paste; double the length in half with the paste side inwards, and place it on the wall, beginning at the top, and working it downwards with a hair broom or duster from side to side, avoiding creases and wrinkles.
Mix 2 lbs. of flour with cold water to the thickness of cream; cook it over the fire till the flour-cells burst and it becomes clear; add 3 oz. of powdered alum, which keeps it good and prevents the paste from becoming lumpy on the paper. Decomposing paste is not only obnoxious, but exceedingly hurtful: the addition of a little oil of cloves is recommended to prevent smell.
VARNISHED PAPERS are cleaned in the same way as varnished paint. See Chapter XIV (Wood).
TO CLEAN UNVARNISHED PAPER, 1. A large clean duster should be tied over the head of a long-handled hair broom, and the walls swept all over from the top downwards, taking a clean duster as often as necessary.
2. Mix and knead flour and water to a stiff dough.
3. Rub the paper downwards in sections with the dough, taking a fresh piece as soon as it becomes soiled. Care must be used not to rub hard or horizontally.