On 14/08/2011 22:56, polygonum wrote:
On Sun, 14 Aug 2011 22:42:30 +0100, Roger Mills
wrote:

On 14/08/2011 20:31, ARWadsworth wrote:
I have just dot and dabbed a bathroom wall.

It turns out that the piece of plasterboard above the window (the bit
in the
recess) is the wrong way around.

Does it really matter or should I swap it in the morning?



I once asked a plasterer about this, and he said that one side is more
absorbent than the other - and gives less time to work the plaster -
but the difference is small, and doesn't really matter. ISTR that he
also said that you use one side for skimming and the other side for
Artex.

Ask the manufacturers. They say, use the white side for plastering and
decorating of all kinds.

Differences a

The actual paper - absorbency, smoothness, etc.
Voids under the paper (I think they make it white side down so any air
bubbles will be under the grey side).
How the paper wraps - it is double-thickness near the edges on the grey
side.

But as half the plasterers who are asked seem to get it wrong, I'd
imagine a lot of plasterboard has been fitted and plastered the wrong
way round. And in non-critical situations it probably makes very little
real difference.

Its partly historical - the makers used to specify one side for skimming
and the other for decorating. These days they specify light side for
both. Many builders etc do not respond well to learning new tricks!


--
Cheers,

John.

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