Bob, do me a favor and take a look at this product.
Read the FAQ and note what they mention about the loads. Note the
legal-babble at the bottom of the pages.
What's your take on it? Am I right to be bothered that they are
offering this for sale?
What about this?
What happens to the R-value of the insulation if it is between the ceiling
and the Infinite Attic system? Also, what if the blown in insulation is
compressed by the plywood? The R-value in either case is not negatively
Yes, the R-value is negatively affected. All insulation relies on the dead
air space contained in the insulation to obtain its "R-" rating. The "R-"
value is the inverse of the heat transfer rate. Reduce the dead air space
by compressing the insulation and the rate of heat transfer through the
insulation will increase. Thus, the "R-" value will decrease and the
insulation will perform less effectively.
Bob Morrison, PE, SE
R L Morrison Engineering Co
I am not an engineer, but I work closely with one. Whenever
we have any work in an attic, especially one with trusses, he
has a strict rule about decking. We are only allowed to
install decking which is required by code and nothing else.
He will not sign off on the engineering if we put anything
else up there.
According to him, trusses are designed to support what they
are going to support and no more. He says that any decking
installed in attics with trusses will encourage the homeowner
to use that space for storage. Since the trusses (unless they
are designed as attic storage trusses) are not meant for
storage, period. My experience with trusses tells me the same
As far as the insulation goes, if there is insulation there
and it gets compressed, it is not going to function as well.
They do mention the garage area of the attic on the website,
and it is normally not insulated, but their claim that the
insulation in other areas will not be compromised is bull.
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