How to Plaster - Techniques - How to dot & dab plasterboard.
Dot & Dab is the name given to the process of fixing plasterboard to a solid wall by way of plaster board adhesive.
Dot & Dab or dry lining as it is also called has become the construction industry and building controllers preferred method of lining wall prior to finish skim.
Dot & Dab or dry lining has improved sound and heat insulation properties over traditional plastering methods, is faster and cheaper.
For the novice plasterer it means that walls that once were the preserve of time served plasterers can now be tackled to a high standard by successful students of The DIY School.
The process involves cutting your plasterboard to fit the given space.
Dots & Dabs should be applied to the space that the cut board is to cover.
The dots should create a continuous boundary around the perimeter of the board to inhibit insects from accessing and colonising the void behind the board.
Particular attention should be paid to the area where the skirting board is to be fixed to ensure that a firm base is provided for the fixing of the skirting board.
Edges of the board must also be well supported to prevent bending of the board joints during and after plastering.
The more dots that are used the more solid the wall will become. On a typical sheet of 6’ by 4’ plasterboard one should at least have a continuous line of adhesive both vertically and horizontally across the board.
Uneven walls can be straightened by first surveying the wall with a combination of levels and string to identify low and high points of the wall. Low points will require deeper dots and dabs, low points will require shallower dots and dabs.
This technique is often used when using AquaBoard to straighten up a walll against which a shower cubicle is fitted and subsequently tiled.
Once the dots and dabs have been applied, offer the board up to the all. Allow the adhesive to grab but do not press home.
Use a combination of levels and straight edges to now check that the board has no undulations both horizontally and vertically. Also use a level to check that the board is vertical. Using a known straight edge, the manufactured edge of a piece of plasterboard is ideal and can be cut to any size that is needed. Tap the board in a place where it will correct any deviations from the desired line. Do not tap with your level as it will become damaged.
Once the board is level, tap it firmly home for final positioning.
Now take the next piece and follow the same process. However the second and all subsequent pieces must not only be flat and vertical in their own right but must also be flush with each adjacent board to provide a flat wall that neither dives in or out along its length.
Remember that when working across window reveals that either side of the reveal needs to be applied relative to the opposite side of the window.
Plasterboard adhesive dries quickly enough that it can be skimmed on to within a couple of hours. This is subject to the depth of adhesive used.