Yet another fibreglass question (John???)

  • Thread starter Thread starter DeadPoet
  • Start date Start date
DeadPoet

DeadPoet

carpe diem
Since we Europeans can't find the 703 panels, we have to look for alternatives, and to make things worse, all companies have completely different product lines in *each country* ... sigh :mad: :mad:

So I found this company in Belgium which has alot of diff stuff, unfortunately without absorbtioncoefficients, which fortunately can be found on the their Dutch site for most of their products.

anyways, question of this post: I gathered a whole bunch of numbers, materials and prices.
Could you guys take a look at it please. Are these prices ok ? (=factory direct)

My guess is the Sonebel113 material has stunning results for only being 25mm/1" thick, and costing not that much, but it only has20kg/m³, while I was always told to go for +40kg ?????
The Akustik TP2 material looks interesting too, but I could find the coefficients, I'm waiting for them to answer a mail I sent.
Second choice is the Metal Building Panel stuff, though those coefficients are for 80mm, but my guess is those for 50mm will still be better than other products. And this one is only 16 kg/m³ :confused: :confused:
Or am I reading the numbers wrong ? The PDF says: as measured with a thickness of 80mm in a perforated inner box

confused all the way....


Herwig
 

Attachments

  • table.webp
    table.webp
    47.2 KB · Views: 198
It seems that Owens Corning have sold their UK business to Knauf. O-C products are now available under the Knauf-Alcopor name in the UK, the slab fiber products known as Crown Slab S300. Maybe same for rest of Europe?
http://www.knaufalcopor.com/products/gmwinsl.asp

If looking at a fiberglass board get something greater than 30 kg/m3 (703 = 48 kg/m3 or 3lbs/cu.ft.)in density. If you are looking at a rockwool board something greater than 45 kg/m3 will work well (RW3 rockwool board which is 60 kg/m3 is pretty much acoustically equivalent to 48kg/m3 fiberglass products like 703).

Personally I'd use Rockwool - here it's cheaper and easier to find.

Cheers
 
Something else which unless (like me) you have no space to work with is slab thickness. Rockwool RW2 33kg/m3 100mm thick direct mounted to wall Absorption co-efficient 0.35 at 125 Hz if only 50 mm RW2 used then Absorption co-efficient 0.15 at 125 Hz. One incarnation of my drum room used regular Rockwool Batts 33 Kg/m3 but 100 mm to compensate for it's lighter weight plus it was very cheap. It knocked the room sound down to nothing.

Thick is good ;)
 
You must log in or register to reply here.
Back
Top