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Posted by on July 12, 2006, 8:03 am
>Styrofoam is R4-4.5" Blue or pink foamboard is R5"
Same thing. All R5 per inch. Open cell expanded polystyrene
(white coffee cup material) is R4 per inch...
>Foil faced Polyisocyanurate foamboard is R7.2"
These days, it's often stamped "R6.8" (per inch.)
Add about R3 per foil, if the foils are exposed.
Nick
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Posted by m Ransley on July 12, 2006, 9:15 am
Nick, White Styrofoam is not R5", extruded polystyrene, the pink Owens
Corning or blue Dow is R5" . White Styrofoam board is sold just like R5
extruded polystyrene board, in the same manner, but is inferior in R
value, workability and stability.
Polyisocyanurate foilfaced newly used rating of 6.7"-6.8" is the aged
or mature R value after R 7.2" polyiso outgasses.
Perhaps you could provide us with some detailed mathematicals of your
opinion.
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Posted by on July 12, 2006, 12:53 pm
>White Styrofoam board is sold just like R5 extruded polystyrene board,
>in the same manner, but is inferior in R value, workability and stability.
Where can we buy this "white Styrofoam board"? :-)
Nick
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Posted by Edwin Pawlowski on July 12, 2006, 7:37 pm
>>White Styrofoam board is sold just like R5 extruded polystyrene board,
>>in the same manner, but is inferior in R value, workability and stability.
>
> Where can we buy this "white Styrofoam board"? :-)
>
> Nick
Styrofoam is the blue material extruded by Dow Chemical. Styrofoam is a
registered trademark of Dow but often the name is mis-used when referring to
any other type of polystyrene foam board, extruded or molded and wire cut
such as the CLOSED cell expandable polystyrene board, sometimes called bead
board.
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Posted by on July 13, 2006, 7:02 am
>Styrofoam is the blue material extruded by Dow Chemical. Styrofoam is a
>registered trademark of Dow but often the name is mis-used when referring to
>any other type of polystyrene foam board, extruded or molded and wire cut
>such as the CLOSED cell expandable polystyrene board, sometimes called bead
>board.
EPS is open cell. X (extruded) PS is closed.
Nick
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