Glass wool

Glass wool (UK) or fiberglass insulation (US) is an insulating material made from fibres of glass arranged into a texture similar to wool. Glass wool is produced in rolls or in slabs, with different thermal and mechanical properties.

Manufacturing processAfter the mixture of natural sand and recycled glass at 1,450 °C, the glass that is produced is

converted into fibers. It is typically produced in a method similar to making cotton candy, forced through a fine mesh by centripetal force, cooling on contact with the air. The cohesion and mechanical strength of the product is obtained by the presence of a binder that “cements” the fibers together. Ideally, a drop of bonder is placed at each fiber intersection. This fiber mat is then heated to around 200 °C to polymerize the resin and is calendered to give it strength and stability. The final stage involves cutting the wool and packing it in rolls or panels under very high pressure before palletizing the finished product in order to facilitate transport and storage.

UsesGlass wool is a thermal insulation that consists of intertwined and flexible glass fibers, which

causes it to "package" air, resulting in a lowdensity that can be varied through compression and binder content. It can be a loose fill material, blown into attics, or, together with an active binder sprayed on the underside of structures, sheets and panels that can be used to insulate flat surfaces such as cavity wall insulation, ceiling tiles, curtain walls as well as ducting. It is also used to insulate piping and for soundproofing.

Density kg/m3: 80

Thermal conductivity W/mK: 0.036

Glass wool class I

For a section of my project, the outer wall:

Rmin=2,7m2K/W for the outer wall

R=Ri+Σdλ

+Re

R=Rsi+R1+R2+R3+R4+R5+R6+Rse→0.125+0.404+x/0.036+0.042<2,70→

0.571+x/0.036=2,7→x/0.036=2,7-0.571→

x=2,129*0.036→x=0.07m

No. Layer Thickness Thermal dA  d[m] conductivity [m2k/W]  λ[W/mk]

1 2 3 4 S=3/4

1 Plaster 0.020 0.700 0.0292 Masonry 0.250 0.800 0.3133 Plaster 0.020 0.700 0.0294 Water vapor barrier 0.001 0.170 0.0065 Glass wool class I x 0.036 x/0.0466 Outer plaster 0.020 0.700 0.029

TOTAL: 0.404