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Foil / bubble wrap insulation

G

gareth

Jan 1, 1970
0
I've just bought a roll of foil / bubblewrap to use in my attic - its going
between the plasterboard and a 2ft thick stone wall. I was going to put the
shiny foil side facing in - however the instruction give a different story;

Roof insulation - foil inside unless using plasterboard then foil on
outside.
Wall - foil outside
Floor - foil on top unless using insulation then foil go's on outside.

I thought the foil would always go on the hot side - facing inside to
reflect radiant heat in?

Gareth.
 
M

m Ransley

Jan 1, 1970
0
Do you have an R value for the product, Ive seen what you describe and
believe it is not worth the expense. R 7.2" foamboard followed by R 5.5
foamboard lastly R 3.5 fiberglass are your best bets
 
G

gareth

Jan 1, 1970
0
I don't know the exact values but it claims to be "equivalent to 55mm
Polystyrene" I know exactly what you mean about the cost, an 8m x 600mm roll
was £12. I'm using it to repair an area of the wall, at some point the gap
behind the plaster has been filled with a blown insulation. The patch I'm
working on has already been replastered but they removed the insulation
behind (or it fell out) and it was causing a cold spot with occasional
condensation during really cold spells.
 
G

Gene S. Berkowitz

Jan 1, 1970
0
I've just bought a roll of foil / bubblewrap to use in my attic - its going
between the plasterboard and a 2ft thick stone wall. I was going to put the
shiny foil side facing in - however the instruction give a different story;

Roof insulation - foil inside unless using plasterboard then foil on
outside.
Wall - foil outside
Floor - foil on top unless using insulation then foil go's on outside.

I thought the foil would always go on the hot side - facing inside to
reflect radiant heat in?

Gareth.

I think it's probably because the foil serves as a vapor barrier, not
just a heat reflector.

--Gene
 
M

m II

Jan 1, 1970
0
gareth said:
I've just bought a roll of foil / bubblewrap to use in my attic - its going
between the plasterboard and a 2ft thick stone wall. I was going to put the
shiny foil side facing in - however the instruction give a different story;

Roof insulation - foil inside unless using plasterboard then foil on
outside.
Wall - foil outside
Floor - foil on top unless using insulation then foil go's on outside.

I thought the foil would always go on the hot side - facing inside to
reflect radiant heat in?


I think it would depend on whether you wanted to keep heat out or in.
In a warm climate, you want the shiny stuff facing toward the roof, to
keep the rooms below cooler. If in a really cold climate, shiny side
goes down.

There has to be an airspace next to the shiny side in order for it to
reflect anything back.

============================
# Insulation for houses and tents in a cold environment. A sheet of
mylar covers the inner wall of the house or tent, with the shiny
surface facing inward. This reflects body heat back into the house or
tent, warming the interior more efficiently.
# Insulation for houses and tents in a hot environment. A sheet of
mylar covers the outside wall of the house or tent, with the shiny
surface facing outward. This reflects the sun's heat away from the
house or tent, cooling the interior more efficiently.

http://en.wikipedia.org/wiki/Mylar

==================================



http://av.rds.yahoo.com/_ylt=A0Je5W...files/Refelctiveinsinpreengmetalbuildings.pdf


http://snipurl.com/ajys




http://www.healthgoods.com/Educatio..._Design_and_Construction/radiant_barriers.htm


http://snipurl.com/ajyu
 
m II said:
In a warm climate, you want the shiny stuff facing toward the roof, to
keep the rooms below cooler. If in a really cold climate, shiny side
goes down.

I don't think it matters, for heatflow, but facing it down keeps it
from accumulating dust, which can prevent it from working.

Nick
 
M

m II

Jan 1, 1970
0
I don't think it matters, for heatflow, but facing it down keeps it
from accumulating dust, which can prevent it from working.


Dust is not our friend. I don't care HOW cute dust bunnies are.





mike
 
N

News

Jan 1, 1970
0
I use a foil/bubble/bubble/foil product in between the floor joists of my
house.
I use this because I figure that there is less temptation to mice and rats
to build nests in this product compared to fiberglass. I'm in south AL, so
it's not too cold very long............

Does it make any difference to the thermal performance of the house?
 
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