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OMG I FORGOT ABOUT THOSE.

Yes, that is a great idea, ... even though I don't eat eggs, but yes. Great idea, thanks.

You can buy them for cheap in shops that specialise in packaging. Search on google for: "buy carton egg boxes (YOUR AREA)".

I'm on it, just to see what I can get but I rather just buy the eggs, and then slowly build my wall and roof with it. That way I have an excuse to eat eggs.

Does a carpet rrally help ? I was torn between that or just a thick curtain.

I think carpet would probably work better than a tick curtain. This sounds like an effective solution for what you're looking for!

But arent carpets more expensive than curtains. I will be checking that out, because that isn't a bad idea. When I looked for the curtain, I came to 2500 Euro.

Try carpet scraps! Most carpet wholesellers and resellers will have small portions of carpet that they are unable to sell and get thrown in a scrap pile. Most are willing to sell it at a very discounted price. I'm sure you can find it online for cheap as well. The problem with curtains is that they are not thick enough to be effective at noise cancelling, unless you purchase a large quantity. Carpet scraps might be cheaper in the long run. Either way, an extra layer of carpet or a curtain will make a difference and is cheaper/faster than an additional layer of sheetrock/drywall.

Oh, I meant noise canceling curtains. That is why I came to 2500 for just the bedroom that is quite small. That is way too much off course. But I will look for carpet sellers, that isn't a bad idea.

I actually bought that one, but I will only use it as finishing touch. I was looking more for an in between that foam and the wall. Something very thick.

Is an additional layer of sheetrock allowed? because this https://www.greengluecompany.com/products/noiseproofing-compound stuff in between an addition layer of sheet rock, covered with that foam works wonders.

Oh, it cant be permanently, because I'm renting. I'm building something like two walls, the normal wall and then the wall I will be making, and between those two walls, I'm leaving soem space to throw some isolation. But I don't know what to throw in there that is cheap. Cheap because I will be needing a lot.

But those rocks you speak of, what are they ?

Sheetrock, Drywall, https://homereference.net/alternatives-to-drywall/ whatever you cover your walls with. Adding another layer of whatever was my suggestion. It sounds like my idea won't work too well for you.

Not really, because I see that it is a permanent product. Unless ... I can put it in my inside wall maybe. The inside walls are the ones I can remove.