Re: [Ekodum] difuzně otevřená konstrukce

[Max Vittrup Jensen <max AT permalot.org>]

Dear Petr Laube,

I just like to make you and others know that during December 2010 the 
e-list for European straw bale building had quite a few postings about 
diffuse ceiling/roof structures (as well as about the troubles of using 
OSB in straw bale buildings.
If you understand English I suggest you have a look at the archives: 
http://amper.ped.muni.cz/mailman/listinfo/strawbale

On http://permalot.org/en/fotoalbum-3 you can see how we made our S.B. 
diffuse ceiling roof (And I can't advice anyone to do it with SB: Much 
too much work/time!).

In general I have very limited knowledge about carcinogenic materials 
such as 'Isover' (Mineral wool insulation), and can't advice well, 
however I would advice you to increase the insulation in the roof to 30 
cm; It's current Danish standards, and judging the future energy trends 
it's good to follow them already now. (The space is easily made with 'I' 
beams, such as the ones from Steico.). Which also opens up for using 
blown in cellulose insulation (and suddenly you're building technique 
suits to something worth discussion on an 'Eko' mailing list?)

Last but not least: About the roof ventilation space. Much depends on 
the final roof. There's big difference on the needs under a green roof 
or f.x. Tondach tiles. In general I wouldn't advice less than 4,5 cm.
For our new project for our educational centre, Jakub Wihan came up with 
a great solution of using the top profile of the Steico 'I' beam as the 
space creator for the ventilation area, by mounting boards on top of the 
beams, and thin breathable plates under the top profile of the I beam. 
Below the I beam we use boards every 40 cm and 2 layers of 'sadro 
karton', with about 30 cm cellulose insulation; Breathable and Natural.

Zdravim,
Ing. Max Vittrup Jensen
"Jen-Sen: Make it Reality"
Consultancy in sustainable engineering, planning and environment
585 15 20 10 - www.jen-sen.cz
------
PermaLot Centre of Natural Building
www.permalot.org
Czech Republic