My friend bought a cheap shed off t'internet a couple of years ago.
Given the appalling weather of 2012, followed by the lousy wet spells
we've had ever since, the shed hasn't stood up to things very well.

It's crammed with "stuff" (not rubbish: kit and materials for which
there's no room in her garage) and the stuff is all mildewed, along with
some of the timbers of the shed itself. The roof has been permanently
damp (or even dripping wet) *inside* for almost a year now: it's almost
as though the roofing felt supplied is porous!

I've now built a second, industrial quality, roof on top of the
original, the weather (and space available) not at present being
conducive to emptying the shed and removing the old roof.

I'd like to ventilate the shed to assist in getting rid of damp which
builds up. I was thinking of making a few 1" holes in the apex of each
end of the shed, and making a few more near the bottom of the walls,
allowing a steady flow of air at all times.

Any comments, or suggestions of a better way to ventilate it, please?

Cheers
John

On 19/02/2014 18:05, Another John wrote:
My friend bought a cheap shed off t'internet a couple of years ago.
Given the appalling weather of 2012, followed by the lousy wet spells
we've had ever since, the shed hasn't stood up to things very well.

It's crammed with "stuff" (not rubbish: kit and materials for which
there's no room in her garage) and the stuff is all mildewed, along with
some of the timbers of the shed itself. The roof has been permanently
damp (or even dripping wet) *inside* for almost a year now: it's almost
as though the roofing felt supplied is porous!

I've now built a second, industrial quality, roof on top of the
original, the weather (and space available) not at present being
conducive to emptying the shed and removing the old roof.

I'd like to ventilate the shed to assist in getting rid of damp which
builds up. I was thinking of making a few 1" holes in the apex of each
end of the shed, and making a few more near the bottom of the walls,
allowing a steady flow of air at all times.

Any comments, or suggestions of a better way to ventilate it, please?

I'm not sure that most wooden sheds need any more ventilation than they
get from the gaps between the planks. My wooden shed has a dehumidifier,
on an extension lead from an outside socket, running inside almost
constantly at present. I get about a litre of water a day out of it.

Colin Bignell

Sounds like you need a dehumidifier to me.
Brian

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From the Sofa of Brian Gaff Reply address is active
"Another John" wrote in message
]...
My friend bought a cheap shed off t'internet a couple of years ago.
Given the appalling weather of 2012, followed by the lousy wet spells
we've had ever since, the shed hasn't stood up to things very well.

It's crammed with "stuff" (not rubbish: kit and materials for which
there's no room in her garage) and the stuff is all mildewed, along with
some of the timbers of the shed itself. The roof has been permanently
damp (or even dripping wet) *inside* for almost a year now: it's almost
as though the roofing felt supplied is porous!

I've now built a second, industrial quality, roof on top of the
original, the weather (and space available) not at present being
conducive to emptying the shed and removing the old roof.

I'd like to ventilate the shed to assist in getting rid of damp which
builds up. I was thinking of making a few 1" holes in the apex of each
end of the shed, and making a few more near the bottom of the walls,
allowing a steady flow of air at all times.

Any comments, or suggestions of a better way to ventilate it, please?

Cheers
John

Another John wrote:

It's crammed with "stuff" (not rubbish: kit and materials for which
there's no room in her garage) and the stuff is all mildewed, along with
some of the timbers of the shed itself. The roof has been permanently
damp (or even dripping wet) *inside* for almost a year now: it's almost
as though the roofing felt supplied is porous!

I had just this problem with a shed that was very well made and thus had
no unintentional ventilation. I fitted 12" square louvre-type vents in
the two opposite ends, just below roof level. This gave a complete cure.
The difference was remarkable. The shed is in a place where the wind
will often blow through it.

Bill

Another John wrote on 19/02/2014 :
My friend bought a cheap shed off t'internet a couple of years ago.
Given the appalling weather of 2012, followed by the lousy wet spells
we've had ever since, the shed hasn't stood up to things very well.

It's crammed with "stuff" (not rubbish: kit and materials for which
there's no room in her garage) and the stuff is all mildewed, along with
some of the timbers of the shed itself. The roof has been permanently
damp (or even dripping wet) *inside* for almost a year now: it's almost
as though the roofing felt supplied is porous!

I've now built a second, industrial quality, roof on top of the
original, the weather (and space available) not at present being
conducive to emptying the shed and removing the old roof.

I'd like to ventilate the shed to assist in getting rid of damp which
builds up. I was thinking of making a few 1" holes in the apex of each
end of the shed, and making a few more near the bottom of the walls,
allowing a steady flow of air at all times.

Any comments, or suggestions of a better way to ventilate it, please?

Cheers
John

We have an 8 x 10 heavy shed made from green rough sawn timber,
overlapped. The gaps in the floor, where the floor timbers are just
butted up I have covered with an old carpet. Idea was to both draft
proof the floor and prevent moisture rising. It is just laid on soil,
but on brick piers. It has been there 20 years, with never any mildew
on anything. The only exception was a few years ago, when the roof
ripped and rain got in, but that soon dried out.

The only ventilation is the door, which is a poor fit and like the
floor, made from timbers butted up where the gaps have expanded as the
timber has seasoned.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk