Plastering over galvanized nails chipping off: any advice?

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greendrummers

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Hello all,
Please apologize if this has been answered already, I searched Google for it and couldn't phrase it properly nor find any answers.
I have noticed that the standard pink plaster (that was used here in our house) doesn't seem to stick to the places where the plasterboard was nailed with galvanized nails with a largish head.
As it dried, with time, the plaster around the nail head has either fallen off or made a crack and will fall off if touched. Is this something because of the galvanized nail reacting to the plaster? It does not do this where screws have held the plasterboard in place. I don't know what the screws are made out of, or is it because the screw hasn't a flat head and the plaster sticks more easily to it?

DOes anyone know about this and what to do (other than not using galvanized nails: but it is too late as they were used in the last bedroom that is now about to be plastered)
like varnish the nail heads with something, or scraping them off, or I d on't know... It is going to be a lot of filling in after the plaster has dried up, all those places where large nails are holding the insulated plasterboard...

Thanks in advance

Claude
 
sure screws have a good key for plaster. galvanised nail heads are more likely to pop, but I think that's more down to movement than anything else.

you might want to screw up the boards that are nailed up where it's failing.
 
Thanks for your answer Twitcher, but the problem is the nails in this room-to-be-plastered are in and are not going to come out now, they are huge long ones as it was to fix kingspan-plasterboard to a very large wooden-batons wall, and now they are in, they have to be left - but is there a solution to cover them up so the movement (which I would imagine you are right in saying that) doesn't make the plaster fall off them?
In all, it isn't anything to do with the galvanizing but just because of the very flat and large head of the nails? So it will be with filling with that white stuff then.. :RpS_crying:
 
What about by putting a bit of that netted-tape that is used between the plaster boards to smooth them out, over the nails? Would that work?
 
If the room has yet to be skimmed, then yes, you can put fibatape over the nail heads:RpS_thumbup:......Screws would have been your best option here to tighten the kingspan/boards to the battens.........also if the timber battens are not fixed tightly, that could contribute to the 'springing' which will result in the nails popping.
 
how big are these nail heads? beats me why someone would use galvanised nails to fix insulated boards onto batons.

get some better fixings in there that should stop the movement.

you can scrim the nail heads, sure that'll give the plaster a key. Make sure they haven't got any grease or oil on them too.
 
In this case, the wall is very old and very thick, the batons are "probably" settled and not moving, though in the other rooms where it happened, it is a builder that used nails as he ran out of screws... Don't ask!
Good to know in future not to use nails :)))
I will go and measure those nails heads (the ones that popped out the plaster)
 
In the case of the nails that came through (though staying in their original position, they haven't seemed to move, and are under the level of the plasterboard) are 5mm. The ones I think will be a problem are 10mm heads. huuuuuuuuuuuuuuuh, that's all I can say. And come on the tape, though maybe screaming (scrimming?) them may do it(though what does that mean?!!)
 
Can I ask when Scritcher, you say to fix it so it doesn't move, you mean the batons and all that behind, before the plasterboard was put up or afterwards, by using screws which would help it to move less? Not being a builder, I only understand what I see and I didn't see the baton work being done.
 
Oui!!! Ca marche, merci! So this is Scrimming. Now I know the proper term for the tape!!!
So you think I still need some screws to consolidate the whole thing? There are a lot of nails there, are you thinking in case of an earthquake or something, the plaster boards may well fall off if not screwed? (I am serious there - not that there are many of those in Wales but there must be a reason)
 
Screws will pull the board/kingspan & batten together:RpS_thumbup:

And then you may discover that the nails are sticking out, so you will hammer them below the surface of the board, which might further disturb the battens if they are loose, then you might need to re-screw the battens, which might disturb the board screws ..........................................:RpS_wink:
 
I've been fixing 50mm insulated plasterboard to battens today, and i'm doubling up on the screws in the field of the board as even though the boards have been stored flat, there is still quite a convex curve on them and the single screws are pulling through. Was even considering gluing the boards as well like the yanks do.
 
I see... Good point about the curve of the insulated board as indeed it isn't very flat. Now I am left with convincing my boyfriend that he needs to buy 10 inches screws so we can put them in the wall... Which he will say to it: "Bah of course screws aren't necessary the nails will do it where have you learned that again!" as some of us like to dismiss anybody else's advise because "we know better"... :RpS_cursing:
Ah, ego....
Sigh....
 
TonyM said:
I've been fixing 50mm insulated plasterboard to battens today, and i'm doubling up on the screws in the field of the board as even though the boards have been stored flat, there is still quite a convex curve on them and the single screws are pulling through. Was even considering gluing the boards as well like the yanks do.
Click to expand...
Was gonna say try using washers if they are popping, but your jointing aren't you. Be ok if skimming over, soon pulls the board in.
 
very good idea the washers, as the screws keep plunging too deep into the board-insulation and I always wonder how it actually holds as it is nowhere near the top... All good tips to remember for next time we put plasterboard up, which hopefully will be a while but you never know!
Thanks all!
 
Next time celotex between the joists and even wrap extra insulation over the joists if you have to insulated boards the shitest system ever thear always bent like bananas
 
spunky said:
Next time celotex between the joists and even wrap extra insulation over the joists if you have to insulated boards the shitest system ever thear always bent like bananas
Click to expand...
That's three times the labour though Spunky.
1. Insulate between battens
2. Insulate over battens
3. Fix board

against
1. Fix insulated board.
 
spunky said:
Next time celotex between the joists and even wrap extra insulation over the joists if you have to insulated boards the shitest system ever thear always bent like bananas
Click to expand...
That's three times the labour though Spunky.
1. Insulate between battens
2. Insulate over battens
3. Fix board

against
1. Fix insulated board.
 
The job I'm on thursday a kitchen extension, the spec for the pitched roof ceiling It's 90mm celotex inbetween rafters 60mm over rafters then plasterboard.
 
fleck knows Tony I'm no expert if it was my house and could get away with celotex between the joists and board I'd do that I hate insulation boards
 
Some of these insulation specs nowadays are well OTT. Must be some backhanders going on between insulation manufacturers and building regs people.
 
I just skimmed a load of artex ceilings in a newish house 15 years old, and all the ceilings where tacked with nails, i just went round first and fired a load of screws in to pull it back up as nails always pop.

Belive it or not there is a bit of a nack to it, tacking boards with nails well properly anyway
 
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