Preventing a crack in a plasterboard ceiling.

Dave Plowman (News · 2020-10-26T14:12:49+00:00

As part of a re-furb in the cloakroom - new lighting and differentplumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of theoriginal roof design. So the joint in the pb at the bend at right anglesto the joists. And the old was cracked there - despite not being that old.What was a sloping roof above is now a roof terrace, and IIRC the joistsfor that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fitnoggins to support the ends. I don't intend having it skimmed, as thatwould require trades brought in. (The old was skimmed but cracked anyway.)

Oct 26, 2020 Last reply: 5 years ago 22 Replies

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Jimk 5 years ago

Is it air dry or quick set though? You haven't answered that have you?

Look forward to the British Gypsum link ...

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alan_m 5 years ago

Combined air-drying and setting compound, workable for around 60 minutes. Another coat can be applied after around 4 hours but if sanding is required between coats then it needs to be dry before another coat.

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[quote] Applied to reinforce flat joints in skim finishes to plasterboard backgrounds and ideal for placing over gaps and reinforcement to small areas of damaged plasterboard. [/quote]

Note: no mention of inside corners.

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[quote] Please note that Thistle ProTape is not a direct substitute for Gyproc Joint Tape. Where there is an increased risk of cracking, or where joints exceed 3mm, the joints are to be reinforced with Gyproc Joint Tape bedded in Thistle plaster. [/quote]

Note: Gyproc Joint Tape is their paper tape.

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Jimk 5 years ago

Oh well each to their own...

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