My last question before I get started with insulating my crawl space.
Remember this is my first time doing this. What does the "R" mean for
insulation. I was going to insulated my crawl space with fiberglass
insulation but a man from the big orange box told me that for a crawl
space I could use (i forgot the exact name) styrofoam and glue it to the
walls and it would have an R10 rating (or something like that). What did
he mean and is styrofoam just as effective as insulation (in Colorado) for
keeping the heat in?
Resistance to heat flow. Specifically, Ohm's law for heatflow says I = E/R
Btu/h, where E is an F temp diff and R is the R-value of 1 square foot of
insulation. For A square feet, multiply the heatflow by A.
For instance, a 2'x8' R5 Styrofoam (vs R4 beadboard) wall that's 70 F on
one side and 30 F on the other will have I = (70F-30F)2'x8'/R5 = 128 Btu/h
of heat (38 watts) flowing through it.
Styrofoam is R4-4.5" Blue or pink foamboard is R5" Foil faced
Polyisocyanurate foamboard is R7.2" R value is resistance to heat flow,
foam costs more, in certain areas it is better where area to insulate is
minimal, it also provides a vapor -air infiltration barrier.
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
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
Niki, Niki, Niki. You can masturbate all the equations you want, but you
can't change material at will.
I have been in the EPS business since May of 1970. I have been in every
aspect of molding expandable polystyrene beads. Packaging, insulation, ICF,
fabricated board. If it was an open cell, do you think the coffee cuts and
seafood containers would be holding liquids?
Want the names of the top chemists for this stuff at NOVA or BASF, or
What is EPS?
Expanded Polystyrene (EPS) is a rigid, closed cell, plastic foam material.
EPS can be molded into a variety of shapes and sizes. EPS is typically
available in large blocks that can be cut into sheeting, architectural
detail work for use on houses and buildings, signage, floatation etc. It's
lightweight properties make it very easy to work with. Architectural EPS is
modified with a fire retardant and is usually encapsulated with an
EPS is totally recyclable. EPS does not contain ozone depleting CFC's or
My Dearest Niki,
Please call Felix at Nova Chemical. Or Warren at BASF. They will educate
you. They can even send you photos of the cellular structure of the
material. They can send you many of the technical bulletins. They can give
you the specifications.
By stating that I'm wrong on this, you merely show your inability to accept
reality. Prove me wrong. Show me the statistics. Show me the technical
data. If the people that have been making EPS since 1954 are wrong, they
would certainly appreciate you setting them right.
I didn't invent the material, I just work with it for the past 36 years.
Millions of pounds of it, tens of millions of parts made with it. Sure
Nick, you know everything.
I respectfully await your reply.
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