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#557056 - 31/01/19 10:31 PM Re: Garage Humidity [Re: IvorMog]
SALMO Offline
L - Learner Plates On

Registered: 15/08/17
Posts: 111
Loc: Mercia, UK
Hi everyone,

Many many years ago MMC told me an airy garage was ideal, a car port even.

So,I bought an Airflow chamber and it seems to work for me.

Discs do not yellow up and bodywork dries up if the car goes in wet (a seldom ocassion).

Keeps dust off too, and the odd small ltem that falls from a nearby shelf.
_________________________
Regards

Geof

70th Anniversary 4/4 (Duratec 1.8), model 1995

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#557060 - 31/01/19 11:01 PM Re: Garage Humidity [Re: IvorMog]
Esprit Offline
Just Getting Started

Registered: 15/09/18
Posts: 63
Many years ago I recall advice in a motoring journal that a car port was better than a garage as it allowed air to circulate.
_________________________
Tom

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#557102 - 01/02/19 09:05 AM Re: Garage Humidity [Re: IvorMog]
Tresco Offline
Just Getting Started

Registered: 13/11/16
Posts: 64
Loc: Thatcham
Would be nice to have a garage but ours is outside and in the winter is in one of these https://www.autopyjama.com/permabag-engl/cars/ which keeps it around 60% humidity and comes out looking as good as it went in and from September last year it is also under one of these https://rolloutcovers.co.uk so now has double protection.
_________________________
Ian

70th Anniversary 4/4 Edition (1976)

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#557117 - 01/02/19 10:04 AM Re: Garage Humidity [Re: Tresco]
Michael P Online   content

L - Learner Plates On

Registered: 02/09/12
Posts: 202
Loc: Vienna, Austria
The relative air humidity is very strongly dependent on the temperature.

100% r.h. at 0°C corresponds to approx.
70% at 5°C,
50% at 10°C and
35% at 15°C.

For details see here.
Unfortunately, I did not find a diagram with English lettering blush (simply search for Mollier diagram or h-x diagram).

The diagram is a bit confusing at first glance.
If you want to know which humidity at a certain temperature corresponds to the value at another temperature, simply proceed as follows:
In the graph, find the intersection of the initial temperature (red line) and the initial humidity (blue line) and then go down or up along the vertical (gray) line to the desired target temperature. From this intersection, follow the blue line > target humidity.

This diagram also shows when air of a certain temperature and humidity condenses during cooling. Simply follow the grey line down to the intersection of the blue line for 100% humidity.

I would try to avoid a relative humidity above 70%. Good ventilation is usually sufficient.

Dehumidifying air is a fairly energy-intensive process. If you decide to dehumidify the air, you should make sure that the room to be dehumidified is well sealed - otherwise you dehumidify the ambient air wink
_________________________
Michael
2018 Plus 4 Sport

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#557122 - 01/02/19 10:18 AM Re: Garage Humidity [Re: Esprit]
Ray Offline

Part of the Furniture

Registered: 05/04/14
Posts: 4009
Loc: Llanelli
Originally Posted By Esprit
Many years ago I recall advice in a motoring journal that a car port was better than a garage as it allowed air to circulate.
. My cars live in an older metal roofed garage with plenty of drafts.does not seem to have an averse effect on them, exept for some condensation drips in cold weather. Biggest problem is warming it enough to work in winter even with a pot belly stove.
_________________________
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.

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#557129 - 01/02/19 10:42 AM Re: Garage Humidity [Re: Ray]
JCK Offline
L - Learner Plates On

Registered: 17/09/16
Posts: 217
Loc: Massachusetts, USA
I keep my car in Massachusetts where summer.rs are hot and humid and winters extremely cold and dry. I don't drive the Morgan in winter because of the cold and the salt and other c**p on the roads. I rent a garage because I don't have one at home. Last year's garage let water in frequently but wasn't ventilated. This year's is concrete, dry, and extremely well ventilated. I am much more relaxed.
_________________________
JCK
1960 Plus 4 Roadster

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#557151 - 01/02/19 11:38 AM Re: Garage Humidity [Re: IvorMog]
Neilda Offline
Part of the Furniture

Registered: 26/04/12
Posts: 4388
Loc: Surrey. UK
My cars live in an oak barn - which suffers from less condensation than brick built garages I've had in the past. I run a dehumidifier... a £200 thing I bought years ago and it's permanently on. I've no idea if it's effective, but I have no rust on tools or cars.

I am told that heating a garage is a bad idea as that does promote condensation.
_________________________
+8 4.8

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#557175 - 01/02/19 01:08 PM Re: Garage Humidity [Re: Craig Jezz]
Michael P Online   content

L - Learner Plates On

Registered: 02/09/12
Posts: 202
Loc: Vienna, Austria
Originally Posted By Craig Jezz
Outside temp 0
Garage temp 38 F
Garage humidity 69%

dewpoint is 29 (going on the online calculator)

Looking at the graph below, I’m within the recommended storage area.

Have I worked this out correctly ?

It's correct. At a relative humidity of 69% at 38°F, the dew point is 29°F (the outside temperature is irrelevant for the calculation). According to the graph this is in the recommended range.
_________________________
Michael
2018 Plus 4 Sport

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#557180 - 01/02/19 01:22 PM Re: Garage Humidity [Re: Craig Jezz]
PHZI Offline
Just Getting Started

Registered: 11/12/14
Posts: 71
Originally Posted By Craig Jezz
Originally Posted By PHZI
Is it me?
Non insulated garage, no floor tiles, no dehumidifier. Cover my cars with breathable outdoor cover. No problem!


No problem at all if you want to keep your Morgan outside.


Inside my garage actually.

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#557190 - 01/02/19 01:47 PM Re: Garage Humidity [Re: PHZI]
Craig Jezz Offline

Talk Morgan Regular

Registered: 27/03/17
Posts: 812
Loc: Oxon
Originally Posted By PHZI
Originally Posted By Craig Jezz
Originally Posted By PHZI
Is it me?
Non insulated garage, no floor tiles, no dehumidifier. Cover my cars with breathable outdoor cover. No problem!


No problem at all if you want to keep your Morgan outside.


Inside my garage actually.


Now that is a good idea 👍
_________________________
Craig Jezz

Morgan 4/4 Sports Sand (Williams & Wolf Tuned)

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