Homeowner Forum / Construction / January 2006

Good day all, I am currently insulating a heated workspace that is not
attached to the house.

It's gas-heated and once insulated will be kept at 5 oC (41 oF) during
the week. When working in the shop, the temperature will be
brought up to 21 oC (70 oF) with the thermostat. [In winter time]

The walls are constructed of 2x4 and I am planning of using a r13
(3,5 inch thick) Flexibatt Mineral insulation from Roxul
(http://www.roxul.com)

I will be using a vapor barrier on the warm side of the walls.
(I.e. just before the gyproc).

There is a few type of vapor barrier that exist on the market.
2 of them are :

Regular 6 mil (0,006") plastic

and

"Rfoil" aluminium vapor barrier.
(Which is an aluminium foil "glued" on a 6 mil plastic.

My question:

#1 :
Any hands-on experience with the product above and any reason to
choose one over another?

#2 :
Does the R-Foil / aluminium vapor barrier offers a "Fire retarding"
caracteristic to the wall ? (I am using regular gyproc)

#3 :
Considering that the workspace is currenlty unheated, does it causes a
problem if the insulating material (roxul) is installed one week and
the vapor barrier the week after ? (Or vapor barrier must be installed
right away after the insulation is in the wall cavities?)

Thanks in advance for your help,
Ben
Bencrx91@hotmail.com