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PostPosted: Fri Apr 27, 2018 4:08 pm 
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As part of the renovation of my Victorian house my builders have replaced most of the old single glazed windows with new sliding sash double glazed ones. The building inspector is saying that the ones in "habitable rooms" i.e. lounge and bedrooms should have trickle vents. I was under the impression that if I was replacing a window that didn't already have a trickle vent then the new one didn't have to have one. I understand the argument that some form of ventilation is desirable, but I really don't want to be carving holes in these windows unless the regulations specifically demand it.

In case it is relevant I would add that some of these rooms have changed functions, for example what was the kitchen is now a bedroom, and the old kitchen window did have one of those pull switch electric fans in one of the window panes. The lounge is still the lounge though, and none of the windows there had any vents.

I've looked through the building regs and can't find anything definitive but I may not necessarily have been looking in the right place.

I was hoping someone with the relevant knowledge might be able to give me something to go back to the inspector with. He was quite adamant and so I need to be sure of my ground.

Thanks,
John


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PostPosted: Fri Apr 27, 2018 4:30 pm 
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Yes 100% you need them.

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PostPosted: Sat Apr 28, 2018 11:16 pm 
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If you just want to keep the inspector happy silicone some on. Remove them when he's finished and keep quiet about it.


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PostPosted: Sun Apr 29, 2018 12:29 am 
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lockie wrote:
If you just want to keep the inspector happy silicone some on. Remove them when he's finished and keep quiet about it.

lol :lol:
other options the old fashioned way cut out say say 30mm from the outer window seal gasket at the outside bottom and another 30mm inside at the top to allow airflow without draught

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PostPosted: Sun Apr 29, 2018 7:53 am 
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Why would you not want trickle vents?

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PostPosted: Sun Apr 29, 2018 10:53 am 
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I'm in a Conservation Area and having spent a fortune on sliding sash frames I suppose I'm just reluctant to spoil the overall look of the windows.

Would you be able to point me towards the section in the building regs that states that I have to have them?

Many thanks,
John


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PostPosted: Sun Apr 29, 2018 12:50 pm 
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Ok, having had another look myself it would seem that I have to have them if there is no other form of ventilation in the room. I'll investigate the possibility of installing wall vents perhaps, or I'll just have to bite the bullet and get the saw out.


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PostPosted: Sun Apr 29, 2018 4:10 pm 
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Saw :shock:

Ours look like they have lots of holes very close to each other, then covered with "decorative flap"

We paid extra to have them fitted when they made our windows, but the daft thing for you is you can close them, so what is the point of having them? (We don't close them)

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PostPosted: Sun Apr 29, 2018 6:03 pm 
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Even when closed they let a trickle of air in.(hence the name)
As you’ll know they let quite a bit airflow in when open. All windows I’ve fitted in the last 15 years(in Scotland) come with them fitted as standard.

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PostPosted: Sun Apr 29, 2018 8:40 pm 
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I get the purpose of them on new build highly insulated homes but not on older draught houses. You spend all this money on triple glazed thermally efficient frames and glazing then stick some holes above it.

When we had our unfolds fitted we didn't have any fitted as they spoiled the look of them. Luckily we are within the regs as we have a vent through the wall where an old chimney used to run in the same room. This vent is out if sight as it's up high and a tray ceiling conceals it.


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PostPosted: Sun Apr 29, 2018 10:01 pm 
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As I understand it the rule is that fitting trickle vents is guidance only on replacement windows in England. The Government did intend to make it compulsory but then they stepped back and made it guidance only. Perhaps someone can clarify this point please?

DWD

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PostPosted: Mon Apr 30, 2018 4:17 pm 
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This is what it says in Approved Document F - Ventilation:

7.3 Where the original windows were fitted with trickle ventilators the replacement windows should include them and they should be sized as set out in paragraph 7.6.

7.4 Where the original windows were not fitted with trickle ventilators and the room is
not ventilated adequately by other installed provisions, it would be good practice to fit trickle ventilators (or an equivalent means of ventilation) to help with control of condensation and improve indoor air quality. Ventilation devices should be fitted with accessible controls.



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PostPosted: Mon Apr 30, 2018 4:25 pm 
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Going back to your original post, I would have thought that as the original windows did not have them then you would not be required to fit them in the new replacements, just advised on the ventilation issue. I am not sure if this case is slightly different as you are renovating the house? I guess if you have open fires planned then you need a good throughput of air to feed the fire and up the chimney which may be a factor in ventilation.

It is worth having a further discussion with BC I would think.

DWD

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