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Corrugated Garage Roof

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CrewCab:
How are you heating it, if for instance you are using a small gas powered space heater it will be fine for 5 minutes and then you will think it's the monsoon season    :bugeye:  ............ as butane and propane contain a lot of moisture, electric heating is "dry" and will avoid the condensation problem but, it's more expensive.

If your getting a lot of condensation with no heating then I'm confused  :scratch:

CC

Darren:
I get a lot of condensation on my larger machines with no heating. And I have gone to great lengths with sealing the place and insulation.

For example, My DPC water membrane is under the insulated floor slab and goes half way up the walls in one piece. The block walls have a membrane in the lower coarse to stop damp rising from the ground. Then I have built a stud partition on all walls, insulated with 75mm foam boards with silver foil on both sides (water proofer as well as heat reflector)
The ceiling has 100mm insulation boards and plasterboarded. The roof has a waterproof membrane and is slated.
The doors are also insulated and lined on the inside.

As you can see, I have gone to the extremes to keep the place cosy and dry. But still it condensates on the big lumps of metal and rust forms quickly.

But stick a heater on, I keep it to around 10deg, and the moisture all disappears. Problem solved. If I had not DCP'd under the floor slab then heating would have made matters worse as water would have been pulled from below ground.

Next year I hope to have the underfloor heating connected ....  :)

Indecently, due to all the insulation using a small electric heater on a thermostat it can get it from, taking a recent example, 5deg to 12deg in a very short time. Around 15-20min. After that the heater is hardly on. Just clicks in now and again.

I'm finding 12deg a little too warm when working, with a coat on anyway, so may turn it down a touch.

When I made that arbor, say an hours lathing the temperature of the room shot up to 16deg and I was too warm !! It also stayed there for the rest of the night from what I remember.

You may have guessed I don't like the cold  :)

Bluechip:
I have the same problem in my concrete garage. This does have a membrane underfloor, not that it does any noticeable good.

Damp air gets in through the d-shaped holes under the corrugated roof and cannot get out. So, as warm air holds more moisture than cold, it says in the air until it contacts any surface below the dew-point, depending on the temp. and relative humidity, then condenses on that surface. Usually metal.

Using any gas burner for brazing or heating slings out a lot of water, as has been stated. I'm not a novice in drowning in condensation   :D

http://www.homemodelenginemachinist.com/index.php?topic=4929.0
See the reply by Ricks son, a few posts down. 1.7 ish kg of water per kg of propane. That's 1.7 liters too.

Not to mention we humming beans breathing out H2O. I don't know how to avoid that .. no suggestions either, if you don't mind  :lol:

Some 20 yrs ago, one of my friends had a Emco (Super 11 ??) That had a boxy section bed. It was rusting like the clappers, so ..
I had lots of 3 ohm 25W Alloy clad resistors doing nowt so we attached the to the machine bed, spaced out, wired 6 I think (?) in series from a 240V/12V transformer.  The bed was kept warmish, but other kit he had still rusted, particularly the Record vice, but not the Emco. Only vaguely warm, but enough.

A de-humidifier will fix the problem, but, as in my case, it's pretty much futile unless I bung up all the holes and stop the wet air getting in. Which is damn near impossible with my concrete garage, 'cos b**gger-all fits properly. QED.

Dave BC

 

Stilldrillin:
Re condensation/ ventilation..... The underside of my carport roof, at dawn today.




I can`t imagine a better ventilated area than a carport......  :scratch:

David D

Shepherduke:
  Plenty to think about there. I live in Cornwall, so that may be an added reason, with the damp air.  I have made enquiries with management regarding the siting of the new lathe in the centrally heated sitting room, but received a rather rude reply!  Problems, problems.

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