From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?_dync harset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Adam

ARWadworth wrote :
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?_dync harset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

It does, but the idea of this material is to bounce radiant heat back
up through the floor rather than dissipate itself under the floor.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Adam

Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

Onetap wrote:


Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

Well strictly speaking, cold air sinks, and enough that it'll push warm
air upwards out of the way...

/pedant

True of course for any homogeneous gas or liquid.

Andy

In article , ARWadworth
writes
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;js...JYCSTHZPCFFA?_
dyncharset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Your intuition is correct, it is indeed snake foil . . . .
--
fred
Plusnet - I hope you like vanilla

"fred" wrote in message ...
In article , ARWadworth
writes
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;js...JYCSTHZPCFFA?_
dyncharset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Your intuition is correct, it is indeed snake foil . . . .

Fred - that really was rather cleaver. Wish I'd thought of it :-)


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk
01634 717930
07850 597257

On 2008-04-08 00:33:52 +0100, "The Medway Handyman"
said:


"fred" wrote in message ...
In article , ARWadworth
writes
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;js...JYCSTHZPCFFA?_
dyncharset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Your intuition is correct, it is indeed snake foil . . . .

Fred - that really was rather cleaver. Wish I'd thought of it :-)

Don't worry, Dave, you will. (paraphrase re. Oscar Wilde). :-)

"ARWadworth" wrote in message
. ..
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?_dync harset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Adam

In suspended floors it is best to use high density insulation slabs to
prevent sound and heat travelling through the floor- it kills two birds with
one stone.

"Onetap" wrote in message
...
On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a link
to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone tell
me
what I am missing out on here as I thought heat did rise.

Adam

Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

That is what I do not understand. The foil is supposed to be under the
floorboards and if the house has normal radiators then I thought there would
be no radiant heat under the floorboards.

Adam

In article , The Medway
Handyman writes

"fred" wrote in message ...
In article , ARWadworth
writes
From the post with the title "Between-floor insulation" there is a link to

http://www.screwfix.com/search.do;js...5ZJYCSTHZPCFFA
?_
dyncharset=UTF-8&fh_search=foil+tec

It says in the review that it encourages heat to rise. Can someone tell me
what I am missing out on here as I thought heat did rise.

Your intuition is correct, it is indeed snake foil . . . .

Fred - that really was rather cleaver. Wish I'd thought of it :-)

Just spread the word, baco foil is for turkeys, it has no application in
building insulation. Btw there is no 'F' in fred (tm) :-)
--
fred
Plusnet - I hope you like vanilla

In article ,
"ARWadworth" writes:

"Onetap" wrote in message
...
On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a link
to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone tell
me
what I am missing out on here as I thought heat did rise.

Adam

Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

That is what I do not understand. The foil is supposed to be under the
floorboards and if the house has normal radiators then I thought there would
be no radiant heat under the floorboards.

Why? What's special about floorboards which stops them radiating heat?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Andrew Gabriel" wrote in message
...
In article ,
"ARWadworth" writes:

"Onetap" wrote in message
...
On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a link
to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone tell
me
what I am missing out on here as I thought heat did rise.

Adam

Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

That is what I do not understand. The foil is supposed to be under the
floorboards and if the house has normal radiators then I thought there
would
be no radiant heat under the floorboards.

Why? What's special about floorboards which stops them radiating heat?


I agree nothing is stopping the floorboards radiating heat, but how much
radiant heat is lost under the floorboards of a house with a normal radiator
set up? I assumed not a lot is lost which is I ask.

Would rock wool not be better and cheaper for this sort of insulation?

Adam

"ARWadworth" wrote in message
. ..

"Andrew Gabriel" wrote in message
...
In article ,
"ARWadworth" writes:

"Onetap" wrote in message
...
On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a
link
to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone
tell
me
what I am missing out on here as I thought heat did rise.

Adam

Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.

That is what I do not understand. The foil is supposed to be under the
floorboards and if the house has normal radiators then I thought there
would
be no radiant heat under the floorboards.

Why? What's special about floorboards which stops them radiating heat?


I agree nothing is stopping the floorboards radiating heat, but how much
radiant heat is lost under the floorboards of a house with a normal
radiator set up? I assumed not a lot is lost which is I ask.

Not a lot with carpet and underlay but an appreciable amount with bare
floorboards


Would rock wool not be better and cheaper for this sort of insulation?

The difference between different sorts of insulation is immeasurably small
compared with the difference between having some and not (as always!). Use
what you like.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)

Andrew Gabriel wrote:
In article ,
"ARWadworth" writes:
"Onetap" wrote in message
...
On 7 Apr, 21:05, "ARWadworth" wrote:
From the post with the title "Between-floor insulation" there is a link
to

http://www.screwfix.com/search.do;jsessionid=1TKB24B535ZJYCSTHZPCFFA?...

It says in the review that it encourages heat to rise. Can someone tell
me
what I am missing out on here as I thought heat did rise.

Adam
Heat does not rise.

Warm air rises (natural convection) because it is less dense than cold
air.

Heat is transferred by conduction, convection & radiation. This
reflects radiated heat back into the occupied space, reducing the
radiant heat loss.
That is what I do not understand. The foil is supposed to be under the
floorboards and if the house has normal radiators then I thought there would
be no radiant heat under the floorboards.

Household radiators are strangely enough poor radiators of heat, they give
up most of there heat energy by conduction, to the air surrounding them.

A three bar electric fire radiates heat energy, a radiator just warms up the
air, and does not get hot enough to radiate


Why? What's special about floorboards which stops them radiating heat?



Wood is a relatively good insulator.

There is going to be very little radiant energy after the heat has traveled
through the floorboard, been largely absorbed, and you will get negligible
re-emission at the other side.

Wood is never going to be a very good radiator of heat unless you set it
alight.

The biggest benefit of sticking a foil product like this under floorboards
would be to stop the draughts.

Alternatively you might see some slight benefit if you take a three bar
electric fire and point it directly at the floor, with the foil underneath it.

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Doctor Drivel"
saying something like:

In suspended floors it is best to use high density insulation slabs to
prevent sound and heat travelling through the floor- it kills two birds with
one stone.

now has image of Drivel's cellar fitted out with automatic bird-killing
catapults
--

Dave