On 26/10/2020 14:12, Dave Plowman (News) wrote:


What would be the best way to avoid the new cracking? Suppose I could fit
noggins to support the ends. I don't intend having it skimmed, as that
would require trades brought in. (The old was skimmed but cracked anyway.)


A photo may help but stopping one side of a join moving with respect to
the other side with noggins or a strip of wood would help prevent cracking.

Also pre-filling any largish void in the join before taping helps.

Was there any tape beneath the skim plaster?

Plasterboard (USA drywall) jointing compound is very easy to sand but
try to get a decent finish when applying compound and avoid a LOT of
dust later.

Based on my experiences....

https://www.screwfix.com/p/ph2-drywa...2-2-pack/6623v
Plasterboard screws should not penetrate through the paper. The bits
above in a power tool stop the screw going too far in. Otherwise drive
the screw most of the way in with a power tool and then use a manual
screwdriver to finally tighten the screw so it's just below the surface
of the board.

To fill any screw holes apply the compound in one direction and
immediately wipe of any excess in another direction. It usually takes 2
or 3 applications to fully hide a screw head if not skimming. Let the
compound dry between applications.

A proper jointing knife helps a lot
https://www.screwfix.com/p/forge-ste...-6-152mm/7738c
these blades have a lot more flexible than a blade perhaps used for
stripping wallpaper etc. The flexible blade helps with feathering edges.
Note these high carbon steel blades can rust easily so after use and
cleaning dry immediately with a cloth or kitchen towel.




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