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Posted by jackary on April 9, 2008, 3:26 pm
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>
> > The trouble is that everything is going very rusty, very quickly,
> > including all new tools that are in boxes.
> > I'm already thinking of 4" fibreglass insulation in the roof and
> > plasterboarded over.
> > But the main problem (I think) is that there is no heat at all in the
> > there and is causing condensation. I have a couple of gas heaters but
> > don't like the idea of naked flames in the workshop when I'm not there.
> > Brad.
>
> Atmospheric moisture is bad enough for rust, but you are adding to it with=
> the gas heaters. All heaters with a flame, whether gas, oil, paraffin, or
> wood create water as a product of combustion, so unless the heater has a
> flue to the exterior of the building you are causing the rust by warming i=
t.
> That may seem contradictory but it's true.
>
> The three solutions are to get electric heaters, get flued gas heaters, or=
> get a de-humidifier. I use the last option as it is cheaper to run than
> electric heating. The only drawback with cheap de-humidifiers is that they=
> rely on ambient temperature to defrost, hence the defrosting doesn't work
> below about 5=BA. That really isn't a problem because at these temperature=
s
> (such as we have overnight at the moment in the south) the realative
> humidity is very low, so it can be switched off without any significant ri=
sk
> of rust.
>
> Cliff Coggin
Dave
I have a 6m square shed built with 4x2 walls and 6" joists for the
roof. It is split in two down the centre with a 4x2 stud wall.One side
( my workshop) is insulated with 100mm rockwool on all walls and the
roof. The other side is not insulated and has an aluminium garage
door. The workshop has two electric heaters. I only switch on when I
am there and it is too cold. I have no problem with rust at all in the
workshop side but it does occur in the other half. I believe that the
insulation keeps the temperature more stable and that prevents
condensation forming on cold ( cooler) objects. If you put a mirror in
the freezer then bring it out into the warm room condensation
immediately forms on it. But if you leave the mirror in the room so
that it changes temperature as the room temperature changes it will
stay clear. As long as the shed temperature changes slowly enough to
prevent the larger mass of the machines from becoming fridge mirrors I
think you will avoid surface rust. This works for me but if you think
I have done something wrong then there is always WD40.
Regards
Alan
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> in the shop.
> I had to put up with one in an unlined brick garage once and the rust
> problem was reduced no end.
> Just simple lubrication took care of the rest.
>
> Remember for a freezer to work it has to give out heat and if it keeps
> the dew point at bay then it's doing it's job.
>
> Insulation is the only real answer.
>
> .
> --
> Regards,
>
> John Stevenson
> Nottingham, England.
>
> Visit the new Model Engineering adverts page at:-
> http://www.homeworkshop.org.uk/
>