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Cons 127

building construction 3 - Lecture 7

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  1. 1. PLASTERING AND DRY LINING Building Construction III Spring 2012 Dr.Hikmat Hammad Lecture 7
  2. 2. Dry lining • It is covering the wall surfaces by plasterboard, strawboard, fiberboard, plywood or similar sheet materials. • This method reduces the construction time, simplifies the work and improve the quality of the finishing. • By dry lining insulation and fire resistance values of a wall can be improved by incorporating suitable materials. • A lot of defects which might happen in plastering can be eliminated by dry lining.
  3. 3. • Most common method is using plasterboard as lining material. • Plasterboard consist of an aerated gypsum core sandwiched between two strong paper liners. • Most plasterboards have one surface ivory and the other gray colored paper. • Only gray color surface is suitable for the application of board plasters. • The other surface is ready for direct decoration.
  4. 4. • There are different sized plasterboards available: • Wallboard: it has several standard sizes but the most popular size is 240*120 cm. thickness 9.5 or 12.7 mm. there are both sides ivory colored or one side ivory other side gray color types. • Plank: it has a size 240*60 cm with thickness 19 mm. surface finish is same as wallboard. It is mainly intended for fire protection of structural elements, and lining for doors and partition walls where sound insulation and fire protection is rather important.
  5. 5. • Lath: it has a size 120*40.6 cm with thickness 9.5 mm and 12.7 mm. with shorter length and narrow width it is used in places of difficult access such as ceilings. • Baseboard: it has a size 120*91.4 cm with thickness 9.5 mm. and it is alternative to lath in ceiling lining works.
  6. 6. Method of applications • Lining walls with plasterboard is made in three ways: – Fixing on timber battens – Fixing on metal channels – Plasterboard bonding
  7. 7. Fixing on timber battens • In this method timber battens of 40*20 mm are fixed vertically on wall with 40-5- cm spacing suitable to the type of plasterboard. • Plasterboards are fixed on the battens by galvanized steel nails with suitable lengths according to the board used at 15 cm spacing. • The joints between the boards and external and internal corners are specially treated with joining tape and filler.
  8. 8. Fixing on metal channels • In this method plasterboards are fixed to galvanized steel or aluminum channels by self-tapping screws at about 30 cm centers. • Metal channels can be fixed on surface of brick or block walls by plaster dabs or nails or they can be the elements of stud partition walls
  9. 9. Plasterboard bonding • Bitumen imp fiberboards pads are fixed to the background with adhesive. After the pads are aligned and firmly secured bonding or board finishing gypsum plaster are trowelled on between them. • The boards are firmly placed over the dabs. It is supported until the plaster sets. • The joints are again treated to make the two sides level.

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building construction 3 - Lecture 7

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