Lesson 4 Levelling a Ceiling Dave Winchester 2010

Levelling a Ceiling Learning Outcomes Recognise a Datum Line Describe how to level a ceiling Identify a levelling cradle, and its uses Dave Winchester 2010

Question Discuss among your group and write down your answers for the following questions What is the point of levelling a ceiling ? On what kind of work would it be beneficial to perform this particular task? You have five minutes for this task Answers To provide a true level surface for running in - situ moulds on Every time you are running a mould an in-situ mould Dave Winchester 2010

Dave Winchester 2010

Levelling a Ceiling A Datum line is a level line Snap a level datum line around the room about 225 mm from the ceiling. If the room contains a beam, snap the line below the soffit of the beam. Select a point on the ceiling about 150 mm in from the wall that looks as if it is the lowest point of the ceiling. Dave Winchester 2010

Levelling a Ceiling At this point, place a dot with a lath or piece of plasterboard bed on. Hold a square onto the floated wall and the dot. Tap the dot in or pull it out until the square sits squarely on the wall and the dot Dave Winchester 2010

Dave Winchester 2010

Levelling a Ceiling Having positioned the first dot, a mark is made on the square in line with the datum point. Further dots can be positioned on the ceiling and lined up with the marks on the square and the wall Screeds can now be formed between the outside dots and the intermediate dots. Dave Winchester 2010

Levelling a Ceiling The ceiling can then be floated and ruled in to a true, flat surface Devil and consolidate the floated surface and put on a finishing coat when the material has set. Dave Winchester 2010

Dave Winchester 2010

Levelling a Ceiling Concrete beams or plasterboard beams are floated to increase the fire rating (especially with plasterboard beams that are encasing a steel structure), also to improve the straight lines of the beams themselves. Dave Winchester 2010

Levelling a Ceiling The floating of a beam is not too dissimilar to floating a ceiling. The beads can be squared in from a floated ceiling (as described earlier) by holding the square flat onto the ceiling and marking the square, where it touches the bead, at one end of the beam. Dave Winchester 2010

Levelling a Ceiling As long as the ceiling is true and flat, the square can be held along the length of the bead at regular spacing, so that there is equal distance between the angle bead and the ceiling. Dave Winchester 2010

Ceiling at different heights Question You have been sent on a job, the job involves levelling a ceiling which has two beam running across , you notice that the ceiling is at different height between the beams How can this be achieved without using a datum line or a laser level? Beam Beam Ceiling at different heights Dave Winchester 2010

Levelling a Ceiling Levelling Cradle Spirit Level A Levelling Cradle is used when the ceiling has to be levelled around a beam. Levelling Cradle Beam Spirit Level Dave Winchester 2010

Levelling a Ceiling Bonding Compound Chalk Line Spirit Level Beam Beam Chalk Line Spirit Level Plasterboard Dots Levelling Cradle Dave Winchester 2010

Recap What is a datum line Answer A Datum line is a level line How do you level a ceiling By using a series of dots and screeds set from a datum line What is a levelling cradle A Levelling Cradle is used when the ceiling has to be levelled around a beam.   Dave Winchester 2010