Level concrete roof with expander

[Sittställning]

Hey!

I'm having a discussion with a friend who claims that 800cc is enough between expansion nails, which it might be...

But what is the recommendation? 300cc?

This is about ceiling gypsum, the type of tiles with beveled edges that are basically just going to be painted.

 

[Åsa Lund]

The variety is called gipsplank
Don't know the answer but 800 sounds wrong

 

[plåtrickard]

A little more information might be good, if it's the regulations then maybe, but if you're going to set the plaster with them, then no I wouldn't do that.

 

[Nicro]

What is the weight of the plasterboard, the framework, and any items that may hang/mount? Calculate (low) that the expansion spike can handle about 50kg, then divide the weight by 50 to get an idea of the minimum number of fastenings. Expansion spikes are not optimal for ceiling mounting; look into concrete screws.

 

[Sittställning]

It's about framing a roof with 28x70 fasteners in concrete using expansion nails, 800cc between each expansion. So 300cc between frames and 800cc between nails. The gypsum board is 1200x600.

I think it seems a bit sparse and would prefer about half of that.

Gypsum usually weighs around 10kg per sqm.

 

[freddan83]

I drove cc600 between the nails, I think I read it in the installation instructions for the secondary rules.

 

[tergo]

when spacing the upper floors in houses with 28x70 stripping and 1200c/c between the roof trusses, you attach the stripping with 2 pcs of 3" galvanized nails to the trusses, and it holds for gypsum

a 1200x600 gypsum weighs about 7-8 kg

 

[Sittställning]

when thinning upper floors in houses with 28x70 spacing and 1200c/c between rafters, you attach the spacing with 2 pieces of 3" galvanized nails in the rafters, and it holds for gypsum

a 1200x600 gypsum weighs about 7-8 kg

Do you think it's safe to trust expanders at 800cc then?

 

[Snappahaneklanen]

A quick Google search shows the cost for expansion nails at less than 2 SEK each. At that cost, I would have used twice as many as recommended and then slept well at night.

When in doubt, overdimensionera!

 

[Sittställning]

Quick Google shows the cost of expansion nails at less than 2 SEK/each. At that cost, I would have used twice as many as recommended and then slept well at night.

When in doubt, over-dimension!

Haha I completely agree! 400-600cc I consider just right. I don't want to feel the studs flex when I drive into them.

 

[tergo]

Do you dare to trust an expander on 800cc then, do you think?

Yes, if the quality of the concrete is normal, but try attaching a batten with c/c 800 and see how well it holds.

 

[Matti_75]

when you space out upper floors in houses with 28x70 spacing and 1200c/c between the rafters, you attach the spacing with 2 pcs 3" galvanized nails to the rafters, and it holds for gypsum

a 1200x600 gypsum weighs about 7-8 kg

28x70 should be nailed with double 4” nails in each rafter.

 

[Matti_75]

It will hold with 800c/c

 

[Sittställning]

It will hold with 800c/c

Awww! Then I'm wrong, right! Can't you say 600 instead?