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In­stall the lower panel first as this will help sup­port the top panel dur­ing fix­ing. If the wall­ceil­ing junc­tion will be squarestopped then it may be prefer­able to fix the top sheet first as this will form a neat edge at the top of the wall.

Mea­sure and cut the sheet to fit around any win­dows or doors.

Ap­ply glue daubs to the studs 300mm apart. Do not place glue where the edge of the sheet will be lo­cated.

Place some small off-cuts of plas­ter­board at in­ter­vals along the wall-floor junc­tion and then rest the sheet on th­ese.

Press the sheet firmly into place at the lo­ca­tion of each glue daub.

Screw us­ing 25mm x 6g Gib Grab­ber plas­ter­board screws along the top edge of the sheet in the ta­pered area on each stud, start­ing in the cen­tre and work­ing to­ward the ends.

Con­tinue screw­ing the perime­ter of the sheet with fix­ings 300mm apart. Do not plas­ter­board screw around win­dows and doors where glue has been placed.

Cut the top sheet to fit around any win­dows or doors.

Lift the top sheet into po­si­tion and rest on top of the bot­tom sheet and at­tach as per the first sheet.

When fix­ing ver­ti­cally, start at a win­dow or door and cut the first sheet to fit so that any joins are fur­ther than 200mm from the cor­ner of the win­dow or door. Also en­sure that joins ex­tend a min­i­mum of 200mm be­yond the cor­ner of the edge of the win­dow or door.

Deal­ing with grooved jambs

For best prac­tice, ar­chi­traves should be used. How­ever, if the use of grooved jambs is unavoid­able re­mem­ber:

En­sure that best prac­tice has been used to in­stall win­dows and doors, ie the back edge of the groove and the front face of the tim­ber line up. The plas­ter­board should have 1mm to 1.5mm clear­ance in the groove.

Do not try to force the plas­ter­board into the groove.

Keep joins to a min­i­mum.

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