do you leave a gap when overboarding?

[xxxpaulzzz]

hopefully overboarding several ceilings if i can find a friend next week. i have come across this on a web site:

"Start in a corner of the room and with your helper and the Deadman ready, lift the first board up against the joists and slide it firmly into the corner. Use your Deadman to hold it in place and start to nail it to the joists using galvanised plasterboard nails. Leave a 3mm gap between this and all subsequent boards."

i thought the boards were meant to be as close as possible?

 

[Alastairreid]

Board up tight and use drywall screws every 150-200mm apart.

 

[peaps]

leave a couple of mm to allow for movement. boards screwed tight can/will crack at the joints..

 

[cantaloup63]

delete

 

[PrenticeBoyofDerry]

This link will help
Plasterboard ceiling
Use dry wall screws not nails.

 

[Alastairreid]

leave a couple of mm to allow for movement. boards screwed tight can/will crack at the joints..

What movement? if the boards moved around the finishing would crack.

 

[Alastairreid]

3mm gap to cut
edges of
plasterboard
(bound edges
lightly butted

 

[peaps]

3mm gap to cut
edges of
plasterboard
(bound edges
lightly butted

in my world butted means touching. new timbers move, kids jump up and down and if butted up the joints will crack.

 

[xxxpaulzzz]

This link will help
Plasterboard ceiling
Use dry wall screws not nails.

3mm gap to cut
edges of
plasterboard
(bound edges
lightly butted)

so if its one cut edge against a bound edge what gap if any do you leave?