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Garage Humidity #556934
31/01/19 12:06 PM
31/01/19 12:06 PM
Joined: Apr 2017
Posts: 792
Staffordshire
I
IvorMog Offline OP
Talk Morgan Regular
IvorMog  Offline OP
Talk Morgan Regular
I

Joined: Apr 2017
Posts: 792
Staffordshire
I've been toying with the idea of putting a de-humidifier in the garage and justifying the purchase by offsetting the costs against reduced maintenance on the car and keeping Mog in a better environment.

But being an analytical type of chap, I thought I would measure the humidity level first to see if there would be much benefit.

I've been running the test for a few days now and it's been varying from 51% to 56% with outside humidity in the mid to high 80's.

Garage temperature between +5 and +10 (Celsius)
Outside temperature between -6 and +8

I think most de-humidifier standard settings seem to be that they start up when the humidity goes above 60% although that can be altered on the better models.

Question is, if my garage normally stays below 60%, is there any need for a de-humidifier?

I was out in the car 2 weeks ago in torrential rain for about 4 hours in total (hood up) and a few days later I went for a short drive and then washed the car before returning it to the garage.

So the car has been in the garage in a very damp state but it still seems to have dried out nicely.

Thoughts please on garage humidity levels and their effect on Morgan dryness.


Bob

1999 4/4 1.8 Zetec
Re: Garage Humidity [Re: IvorMog] #556936
31/01/19 12:13 PM
31/01/19 12:13 PM
Joined: Dec 2008
Posts: 17,596
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 17,596
South Yorkshire
I've had dehumidifiers in my garage for over 30 years. I don't leave it running all the time. Last summer it was hardly on. Now it's too cold, as it ices up on the back within a couple of hours.

So although I wouldn't be without one, for those damp days when the car needs drying off, it's certainly not plug in and forget either.

Before this, I would see light surface corrosion on unprotected metal in damp conditions, and I never get that now.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Garage Humidity [Re: IvorMog] #556937
31/01/19 12:15 PM
31/01/19 12:15 PM
Joined: Aug 2013
Posts: 11,545
Salisbury, UK
Peter J Offline
Formerly known as Aldermog
Peter J  Offline
Formerly known as Aldermog
Member of the Inner Circle

Joined: Aug 2013
Posts: 11,545
Salisbury, UK
Our garage is integral with the house, 2 walls and a ceiling shared with the house.
The walls are cavity and insulated, the ceiling is insulated and the window is double glazed.
The roller shutter door is insulated.
The garage is not heated, but even in the winter temperature rarely drops below 10C.
Humidity is as per the house, 50% typically at this time of year.

My woodworking tools stay bright and shiny. So I I don't think a dehumidifier is needed.

If the garage shows signs of condensation, as did a previous one, especially on the uninsulated roof, then I feel that a dehumidifier is essential.


Peter,
Tarka the 'Otter Mog
2014 Plus 8


Re: Garage Humidity [Re: IvorMog] #556939
31/01/19 12:18 PM
31/01/19 12:18 PM
Joined: Apr 2008
Posts: 7,689
Gloucestershire, UK
Hamwich Offline
Talk Morgan Guru
Hamwich  Offline
Talk Morgan Guru

Joined: Apr 2008
Posts: 7,689
Gloucestershire, UK
Yes, I'd be happy with a garage humidity of <60%. When I had the Morgan in a asbestos-roofed concrete garage I needed a dehumidifier on pretty much all the time in winter, if it got down to <70% I was satisfied.


Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 1957 R4 CV, 2005 Ferrari Vipar
Re: Garage Humidity [Re: IvorMog] #556940
31/01/19 12:19 PM
31/01/19 12:19 PM
Joined: Mar 2017
Posts: 938
South Oxfordshire
SFG Offline
Talk Morgan Regular
SFG  Offline
Talk Morgan Regular

Joined: Mar 2017
Posts: 938
South Oxfordshire
I think we would have heard lots of horror stories about cars vapourising when put away wet, if it was really an issue. I just leave the garage door open for a couple of hours after getting it wet.
I hope I have squirted all the recommended preparations over the underside, more for peace of mind, I think. If that was no use, why did I bother?


SFG
2012 4/4 Sport
Re: Garage Humidity [Re: IvorMog] #556941
31/01/19 12:33 PM
31/01/19 12:33 PM
Joined: Mar 2017
Posts: 977
Oxon
Craig Jezz Offline
Talk Morgan Regular
Craig Jezz  Offline
Talk Morgan Regular

Joined: Mar 2017
Posts: 977
Oxon
I lined my garage with 50mm Cellotex and fixed 12.5mm WBP plywood over the face

Then Installed industrial carpets tiles, my garage is dry as a bone. No need for dehumidifier electrical bills for me.

Last edited by Craig Jezz; 31/01/19 12:38 PM.

Craig Jezz

Morgan 4/4 Sports Sand (Williams & Wolf Tuned)
Re: Garage Humidity [Re: DaveW] #556943
31/01/19 12:44 PM
31/01/19 12:44 PM
Joined: May 2007
Posts: 4,187
Reading
A11OGE Offline
Part of the Furniture
A11OGE  Offline
Part of the Furniture

Joined: May 2007
Posts: 4,187
Reading
much the same for me, for the past 15 years.
can put the car away damp (hood, chassis etc). No sign of rust.
also all the garden tools etc also stay rust-free.

Don't use it all the time, but like DaveW.

Originally Posted By DaveW
I've had dehumidifiers in my garage for over 30 years. I don't leave it running all the time. Last summer it was hardly on. Now it's too cold, as it ices up on the back within a couple of hours.

So although I wouldn't be without one, for those damp days when the car needs drying off, it's certainly not plug in and forget either.

Before this, I would see light surface corrosion on unprotected metal in damp conditions, and I never get that now.


Steve A11OGE Red 1989 4/4 4 seater

'A Morgan is for life, not just for Sundays'
Re: Garage Humidity [Re: IvorMog] #556945
31/01/19 01:06 PM
31/01/19 01:06 PM
Joined: Jul 2014
Posts: 106
Netherlands
6
60Yards Offline
L - Learner Plates On
60Yards  Offline
L - Learner Plates On
6

Joined: Jul 2014
Posts: 106
Netherlands
My car is in an insulated and mildly heated garage, with a humidity in between 50-55% at the moment. I leave a window open (small gap).
I have a dehumidifier but only use it when I put the car away wet, to dry it quicker. It has a function to automatically switch off after 2-4-8 hrs.
No idea if this makes a lot of difference in the long run, but it makes me feel I'm doing what I can to keep the car in good condition...


Thomas
2017 Plus4
Re: Garage Humidity [Re: IvorMog] #556950
31/01/19 01:38 PM
31/01/19 01:38 PM
Joined: Apr 2011
Posts: 7,798
The frozen North
J
Jack The Lad Offline
Posting Desperado
Jack The Lad  Offline
Posting Desperado
Talk Morgan Guru
J

Joined: Apr 2011
Posts: 7,798
The frozen North
Its a big garage I have so purchased a load of carpet tiles from that B&M place and covered the walls . They are thick and come in different colours . Its made a big difference as I also sealed every gap with caulk . You can feel that difference when stepping inside. Also handy if any of the car doors etc touch the walls.

Re: Garage Humidity [Re: IvorMog] #556959
31/01/19 02:48 PM
31/01/19 02:48 PM
Joined: Mar 2015
Posts: 194
Perthshire Scotland
jimmyw Offline
L - Learner Plates On
jimmyw  Offline
L - Learner Plates On

Joined: Mar 2015
Posts: 194
Perthshire Scotland
A desiccant dehumidifier works in cold environments
I leave it on all winter,it is set to 60% has 3 power settings and drains into a large container.
The pure water is good for mixing with antifreeze for coolant changes .
My wife also used it in her iron. Pure steam .


Jimmy
2015 4/4 Sport Green
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