[TheForge] temporary heat shield

[Bruce Freeman]

Terry,

How temporary is temporary?   Your ideas sound like overkill to me,
though I don't argue that you should be careful.

When soldering copper pipe with a torch, one typically uses a simple
metal shield to protect the wood nearby.  The metal should not touch
the wood.  Some torches come with a C-shaped shield that clips onto
the burner end.  It's a double-layer of steel and, in principle,
protects burnables on the outside of the C from the flame which is on
the inside of the C.

My thought would be to get some sort of insulator, and put thin
aluminum (like heavy-duty foil or flashing) on the surface toward the
stove.  For example, build a portable "wall" from sheet metal studs,
with wallboard on one side and sheet aluminum on the other, fiberglass
insulation between.  Unfortunately, commercial fiberglass, while it
won't support a flame, contains a burnable binder, so it would be best
if it not touch the aluminum.  Fiberglass without binder would work,
but may be difficult to work with and difficult to find.

I don't think the polish on the aluminum is an issue.  Foil off a roll
would probably do fine, but it would be easily torn.  Flashing or
aluminum foil is probably shiny enough.  The difference in the total
reflectivity between "shiny" and "mirror finish" is not all that
great.  The latter you can see yourself in, the former reflects more
diffusely.

On Thu, Feb 5, 2009 at 3:43 AM, terry l. ridder <terrylr at blauedonau.com> wrote:
> hello;
>
> i am in need of a temporary heat shield and seeking some advice and
> suggestions.
>
> for peace of mind i would like two heat shields spaced one each a part
> with ceramic standoffs. the question is which is the better sheet metals
> to use for the heat shields.
>
> highly polished aluminium would be the first choice since it would
> reflect the unwanted heat , lightweight, and low in cost.
>
> where would i be able to obtain 2 sheets of 4x8 highly polished
> aluminum?
>
> highly polished chromium steel would be the last choice since it would
> refleact the unwanted heat at the trade offs of increased weight and
> cost.
>
> where would i be able to obtain 2 sheets of 4x8 highly polished
> chromium steel?
>
> the metal heat shield is temporary until we are able to construct a
> warming tile heat shield later in the year.
>
> the metal will not be exposed to salt air/ocean air/open seas air for
> that long of time so i am not worried about corrosion.
>
> poor ascii art below.
>
>   ==================+ +============== <-- metal overhead
>        | <-- wooden frame bulkhead
>        |            | |
>        | l i        | | <-- double wall stove pipe duravent dvl leads to
>        | l i        | |     small engine room exhaust stack.
>        | l i        | |
>        | l i     +------+
>        | l i     |      | <-- harman oakwood wood stove
>        | l i     |      |
>        | l i     +------+
>        | l i     /      \
>   ================================= <-- metal deck
>
>        l -- 1st heat shield 1 inch above the deck and 1 inch from the
>             wooden frame bulkhead.
>
>        i -- 2nd heat shield 1 inch above the deck and 1 inch from the
>             1st heat shield.
>
>        the gap between the stove and the 2nd heat shield will be 12
>        inches.
>
> --
> terry l. ridder ><>
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-- 
Bruce
NJ

The total lack of evidence is the surest sign that the conspiracy is working.