Damp homes, and private tenants

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The Total Water Vapour Created by a Person

If a person does the following over the course of a day:

Drinks 8 Cups of coffee or tea

Boils one pan of water for 10 minutes

Takes a shower

Uses the dishwasher

Washes and dries 2KG of clothing

Breathes normally

They will contribute approximately 2.5KG of water – the equivalent of 10 glasses of water – into the air. WITHOUT GOOD VENTILATION in the home this forms into condensation which will settle on windows, walls and other cool surfaces and can quickly lead to damp and mould.

..
.
.

How does tenant behaviour contribute to causing condensation?​

We now heat our homes to levels previously unthought of and, since energy costs soared, do our best to seal them up to prevent precious heat loss, encouraged by the Governments “ Save It “ campaign. This well meaning and expensive programme has promoted draught proofing, yet inadequate ventilation is one of the main reasons for condensation problems.

We constantly strive to seal ourselves into warm surroundings and to keep down fuel costs when we are inadvertently increasing the level of condensation. Double glazing in windows maintains the temperature of the inner window pane and makes it less likely that condensation will form.

However, the moisture remains in the air until it meets another cold surface or is moved outside the house by ventilation. Before double glazing, the draughts from windows acted as adequate ventilation, thus the effects of condensation were not always noticeable. When the new draught proof sealed units or secondary panes did their job and successfully sealed off the draughts, the condensation became more evident.

Controlling condensation means striking a balance between the way you heat, insulate and ventilate your home. Replacement windows will improve the insulation but will usually also reduce the amount of ventilation. This can be enough to aggravate an existing condensation problem or create one where there was none before.

Unfortunately, there is not and easy answer to the problem.
 
The Total Water Vapour Created by a Person

If a person does the following over the course of a day:

Drinks 8 Cups of coffee or tea

Boils one pan of water for 10 minutes

Takes a shower

Uses the dishwasher

Washes and dries 2KG of clothing

Breathes normally

They will contribute approximately 2.5KG of water – the equivalent of 10 glasses of water – into the air. WITHOUT GOOD VENTILATION in the home this forms into condensation which will settle on windows, walls and other cool surfaces and can quickly lead to damp and mould.

..
.
.

How does tenant behaviour contribute to causing condensation?​

We now heat our homes to levels previously unthought of and, since energy costs soared, do our best to seal them up to prevent precious heat loss, encouraged by the Governments “ Save It “ campaign. This well meaning and expensive programme has promoted draught proofing, yet inadequate ventilation is one of the main reasons for condensation problems.

We constantly strive to seal ourselves into warm surroundings and to keep down fuel costs when we are inadvertently increasing the level of condensation. Double glazing in windows maintains the temperature of the inner window pane and makes it less likely that condensation will form.

However, the moisture remains in the air until it meets another cold surface or is moved outside the house by ventilation. Before double glazing, the draughts from windows acted as adequate ventilation, thus the effects of condensation were not always noticeable. When the new draught proof sealed units or secondary panes did their job and successfully sealed off the draughts, the condensation became more evident.

Controlling condensation means striking a balance between the way you heat, insulate and ventilate your home. Replacement windows will improve the insulation but will usually also reduce the amount of ventilation. This can be enough to aggravate an existing condensation problem or create one where there was none before.

Unfortunately, there is not and easy answer to the problem.
Oh, so you're saying tenants are 100% of the problem eh?!?

How DARE you!!!

Where's your evidence for this?!?

So you think all landlords are PERFECT eh?!?

You disgust me, you make me sick!!!

(just typing that to save the usual suspects the bother ...)

;)
 
Oh, so you're saying tenants are 100% of the problem eh?!?
Without tenants there is no water vapour lol. Its hardly a best kept secret. All insulation and ventilation design and construction is based around occupancy and water vapour. It's the start point for design.

Didn't you dummies know? Perhaps you thought these homes were designed to be empty?


However, some buildings especially modern sealed up versions cope with water vapour really well (because of the latest standards) and other Rigsby shítholes don't and end up with black spot mould.

However, well done all of you for (finally) realising that it's humans that introduce water vapour into a building, now you can improve them.
Almost all black spot mould is occupancy dependant.

The reason air tight modern houses don't have such a problem with it is because they are so well insulated. You can design out black spot mould. Most Rigsbys would rather spend the rent income on themselves.

The instant you put a family inside a house, it fills with moisture. You can ventilate zones or concentrate the the removal of moisture by installing a cooker hood or a shower vent, local to the 'culprit'. This does not remove moisture from the rest of the house, especially those areas where air movement is unlikely, i.e. behind a sofa, in a corner, behind a dresser etc. Moist air WILL hunt out the cold spots and condense - with or without an extractor or an open window.

occupancy and poorly insulated shîtholes = black spot mould?
 
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Now what was it noseall basically said...ventilation has nothing to do with it it's all down to insulation . . And now he is saying modern houses cope with water vapour created by occupants really well. Now how do they cope with it do they have some magicall new extraction system . ...oh I see they do trickle VENTS to help introduce free air and remove the water vapour rich air...the man is an absolute clown
 
You do know that - when you open a window - you're letting water vapour in as well as out, don't you?
oh you do know that it contains a lot less to none so you are actually reducing the saturation within the property.
 
In the UK (a humid climate), typically c. 60% rel. humidity in spring / summer, and c.90% in autumn / winter.

And, the supply of outside air (unlike that from a person's lungs) is effectively never-ending.
so less than the several kilograms produced within a house each day or are you trying to say we should not have any ventilation as its letting in more water vapour in than its dissipating out of the building
 
so less than the several kilograms produced within a house each day

Not necessarily: 10-15g of water per cubic metre of air is realistic.
Therefore, 1-1.5kg of water per 100 cubic metres of air.

are you trying to say we should not have any ventilation as its letting in more water vapour in than its dissipating out of the building

No: what I am saying is that the only source of moisture is NOT the people and their activities.

If it were the case, you could store clothes in unoccupied and unheated garages and sheds, and they wouldn't go mouldy.........
 
as its letting in more water vapour in than its dissipating out of the building
That's irrelevant if it stays in the air, the problem is that, in poorly designed buildings, it condenses on cold surfaces and causes mould.
 
That's irrelevant if it stays in the air, the problem is that, in poorly designed buildings, it condenses on cold surfaces and causes mould.
You won't get through to the thickos. Some on here seriously believe, that the answer to their mouldy Rigsby shītholes, is to open a window. FFS.
Primary defence = Insulation.
Ventilation is important, but it needs to be done sensibly. Premium insulated modern homes could happily exist (with no mould issues) with very little ventilation.
 
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