What is Dotting and Dabbing?
It is a means of securing a flat smooth wall with which you can paint/paper without plastering if need be, sounds like your cup of tea?
It is simple enough; Firstly make sure that you have sound walls and that there are no bits of mortar sticking out, if so remove them with a hammer (watch your eyes!). A common size plasterboard is the 2400 x 1200 x 12.5mm, beware! These boards are heavy so get someone to help you lift them. Cut a strip of plasterboard from a scrap piece of board and cut in into 3 inch (75mm) pieces, now place these on the ground 300mm apart, stand a board vertically on them and judge the distance left in order for the board to touch the ceiling, if the ceiling is over 2400mm i.e. 2700 then you will have to cut a piece to fit the top section, if not keep putting pieces of board under it until the board almost touches the ceiling. Holding the board against the wall use another small piece of board to run a chalk line down the right-hand edge from top to bottom, then prop it against the wall (a clout nail tapped into the wall usually holds it in place). Now grab another board and place it at the side of the first making sure that the board is aligned with the it, place another nail in, continue this until the boards cover one wall, then remove them in the order they were put up i.e. the last board first. Mix a 50 litre gorilla tub of 'plasterboard adhesive' to a consistency of thick cream, using a gauging trowel start to add dots of adhesive to the wall, place them at 300mm centres and make sure the joints are a full solid dot including the skirting line! Once the 'entire' wall is on start placing the boards gently onto the dots of adhesive. You should now have a complete wall with boards sitting on the adhesive, all it needs now is flattening out! Grab a 2 metre length of straight skirting and tap the boards gently until the ceiling line, skirting line and angles are straight, check the wall both vertically, horizontally and diagonally, if there is a section that dips in use a steel coat hanger bent at the end, shove this through the board and feed it in then pull the board outwards until the dip has gone.
Place 'fibatape' over the joints and using a joint cement (available at B&Q Warehouse etc) spatula the joint cement into the joints and allow it to firm up, apply some more to bring it level and allow this to firm up, now apply the final coat that will leave it 'just' proud of the surface, leave this to dry at least overnight. Using a sanding pad, sand the joints smooth and flat then once your happy with it apply a coat of sealer, this will help in the removal of paper and stops the plasterboard from getting damaged whilst removing it.
Once the sealer has dried you can then paint or paper it in the usual manner.
How to Dot and Dab
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28 February 2010
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