Floor gypsum - why?

Lindgrenski · 9 May 2007 at 12:52 PM

What is special about floor gypsum that makes it cost more than regular gypsum, despite being much smaller?

Gypsum board
13x1200x2400: 59.95

Floor gypsum board
12.5x600x2400: 72.95

Pasta · 9 May 2007 at 1:21 PM

Harder disk that doesn't have the same sales volume, which makes the price higher.

/Patrik

Lindgrenski · 9 May 2007 at 1:23 PM

Okay. Is it necessary to use floor plasterboards on top of chipboard flooring in a bathroom, or can I use regular plasterboards?

Pasta · 9 May 2007 at 2:03 PM

ThomasLindgren said:
Okay. Is it necessary to use floor gypsum board on top of chipboard in a bathroom, or can I use regular gypsum boards?

Wall gypsum is more porous and not an approved substrate for tiles.

/Patrik

yens · 9 May 2007 at 3:05 PM

if you've tried carrying a floor gypsum and, for example, a ceiling gypsum in the same size, you'll understand the difference; the weight must be nearly double for the floor gypsum. The sound of floor gypsum against something hard is almost like porcelain against stone. It really provides a rigid base, which is quite nice if you're laying tiles...

Fasting65 · 9 May 2007 at 3:43 PM

But think about it - it's really about pocket change in this context.

Wall gypsum 20 SEK/sqm versus floor gypsum 50 SEK/sqm. If you have a 10 sqm bathroom, you have an additional cost of 300 SEK.

Lindgrenski · 9 May 2007 at 3:44 PM

Fasting65 said:
It can't be the cost that makes the difference - or? It's like pocket change in this context.

I was mostly curious about why the cost differed. Now I have found out why.

Fasting65 · 9 May 2007 at 3:47 PM

Okay, I understand.

jon_h · 9 May 2007 at 4:50 PM

ThomasLindgren said:
Okay. Is it necessary to use floor gypsum on top of chipboard in a bathroom, or can I use regular gypsum boards?

But for heaven's sake, avoid the gypsum altogether, self-level directly on the chipboard. You need to self-level anyway to get the slope, so the gypsum is just a waste of time and money. Additionally, the gypsum must be glued with expensive adhesive if you choose to lay it, so the cost of the gypsum is a small part of the whole.

Lindgrenski · 9 May 2007 at 4:54 PM

jon_h said:
But for God's sake, avoid the gypsum altogether, self-level directly on the chipboard. You will still need self-leveling compound to create slope, so the gypsum is just a waste of time and money. Additionally, the gypsum must be glued with expensive adhesive if you choose to lay it, so the cost of the gypsum is a small part of the whole.

Is it approved then?

jon_h · 9 May 2007 at 5:37 PM

Yes, otherwise I wouldn't recommend it..

And to give you some understanding of the basics, I think you should read the thread at the top.

Lindgrenski · 9 May 2007 at 5:45 PM

jon_h said:
Yes, otherwise I wouldn't recommend it.. And to give you some understanding of the basics in this, I think you should read the thread at the top.

Buying building materials abroad?

jon_h · 9 May 2007 at 5:48 PM

.. in the bathroom forum.

(thought we were there..

)

Lindgrenski · 9 May 2007 at 6:04 PM

Okay, will pass it on to my brother-in-law (plumber) and father-in-law (carpenter) and see what they say about it.

jon_h · 9 May 2007 at 6:14 PM

Sure. And feel free to write here if you want comments about their construction, in case they don't do as I suggested. It's crucial as heck that they follow the current industry regulations and the suppliers' installation instructions to the letter.