Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

Questions:
1. Is it correct that he has to put trickles where they are already?
2. Why, if this is a good idea, isn't he insisting that they are
fitted in the older part of my house?
3. Why are trickle vents a good idea given that:
a. no condensation in the older part of the house which is
without them, and
b. if I am spending so much money to save energy, why would I
want to have a route for drafts
back into my house?

I think the expanded foam canister beckons.

On 17/09/2011 22:14, naffer wrote:
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

I *think* the regs about having trickle vents would have come in between
12 and 25 years ago?

There's a basic rule that when replacing windows you can't 'downgrade'
them (in terms of compliance with regulations); so if trickle vents are
in place in the old windows, you can't replace them with new windows
without the vents.

David

In article
,
naffer writes
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

Questions:
1. Is it correct that he has to put trickles where they are already?
2. Why, if this is a good idea, isn't he insisting that they are
fitted in the older part of my house?
3. Why are trickle vents a good idea given that:
a. no condensation in the older part of the house which is
without them, and
b. if I am spending so much money to save energy, why would I
want to have a route for drafts
back into my house?

I think the expanded foam canister beckons.

There is not a specific requirement for trickle vents but there is a
requirement for there to be sufficient background ventilation in the
property once new windows are fitted.

In older properties this may have come in the form of drafts from the
original windows or from other sources, hence the lack of condensation.
Once drafty windows are replaced, condensation may occur.

Modern trickle vents do seal much better than early ones so should not
introduce drafts and pass only a little extra noise.

I have wooden sliding sash windows here without vents as I think they
look awful on wooden windows but if I was installing placcy ones I'd put
a few in knowing that I could foam them up if there were any negative
effects.

If you really don't want them then bully the supplier into not fitting
them by saying that you will go elsewhere. If it smoothes their feathers
a little then you can tell them that background ventilation is being
provided by other means in accordance with the regs.
--
fred
FIVE TV's superbright logo - not the DOG's, it's ********

On 17/09/2011 22:14, naffer wrote:
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

Questions:
1. Is it correct that he has to put trickles where they are already?

When dealing with building regs, a general guideline of not making
things worse than they were applies

2. Why, if this is a good idea, isn't he insisting that they are
fitted in the older part of my house?
3. Why are trickle vents a good idea given that:
a. no condensation in the older part of the house which is
without them, and
b. if I am spending so much money to save energy, why would I
want to have a route for drafts
back into my house?

I think the expanded foam canister beckons.

Specify that the vents have "hit'n'miss" grills, or other controls such
that they can be turned off and then you have the option either way.

Full gory details he

http://www.planningportal.gov.uk/upl...F_ADF_2006.pdf


--
Cheers,

John.

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Lobster wrote:
On 17/09/2011 22:14, naffer wrote:
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

I *think* the regs about having trickle vents would have come in between
12 and 25 years ago?

There's a basic rule that when replacing windows you can't 'downgrade'
them (in terms of compliance with regulations); so if trickle vents are
in place in the old windows, you can't replace them with new windows
without the vents.

David

The requirement is all about ventilation. How you achieve it is your
business, as long as the BCO is happy.

Its idiotic, BUT as long as there exists so many square mm of vent to
the outside world above height X the regulation is satisfied.

Trickle vents merely ensure that replacement windows into an otherwise
compliant room didn't suddenly suffocate the occupants. But a 4" pipe
through the wall with a hit and miss grille on the inside also meets
regulations.

On Sunday, September 18, 2011 1:57:12 PM UTC+1, The Natural Philosopher wrote:
Lobster wrote:
On 17/09/2011 22:14, naffer wrote:
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

I *think* the regs about having trickle vents would have come in between
12 and 25 years ago?

There's a basic rule that when replacing windows you can't 'downgrade'
them (in terms of compliance with regulations); so if trickle vents are
in place in the old windows, you can't replace them with new windows
without the vents.

David

The requirement is all about ventilation. How you achieve it is your
business, as long as the BCO is happy.

Its idiotic, BUT as long as there exists so many square mm of vent to
the outside world above height X the regulation is satisfied.


Not sure about the height requirement, but open fireplaces would introduce background ventilation (or howling gales !).

When having a fensa fitting, are the rules tigher or more limited than when doing a building regs application ?

No reason not to go the building regs route - the cost of an application will be small compared to the replacement of all the windows in the house.
Presumably the fitter would be OK with this.

Simon.

On Sep 19, 9:56 am, sm_jamieson wrote:
On Sunday, September 18, 2011 1:57:12 PM UTC+1, The Natural Philosopher wrote:
Lobster wrote:
On 17/09/2011 22:14, naffer wrote:
Just about to have some new plastic DG fitted. Total fit around large
house.

The guy from the company noticed that some of our DG windows (all of
softwood, 'cos that's why we're replacing) said, "Where you have
trickle vents already fitted, we'll have to do the same".

We had an extension added about 12 years ago and the DG on wood frames
in that part of the house all have trickle vents. The rest of the
house has older DG on wood, done 25+ years ago without trickles.

I *think* the regs about having trickle vents would have come in between
12 and 25 years ago?

There's a basic rule that when replacing windows you can't 'downgrade'
them (in terms of compliance with regulations); so if trickle vents are
in place in the old windows, you can't replace them with new windows
without the vents.

David

The requirement is all about ventilation. How you achieve it is your
business, as long as the BCO is happy.

Its idiotic, BUT as long as there exists so many square mm of vent to
the outside world above height X the regulation is satisfied.

Not sure about the height requirement, but open fireplaces would introduce background ventilation (or howling gales !).

When having a fensa fitting, are the rules tigher or more limited than when doing a building regs application ?

should be same - all "Fensa" supposedly does is remove the legal need
to involve the actual BCO directly.

No reason not to go the building regs route - the cost of an application will be small compared to the replacement of all the windows in the house.
Presumably the fitter would be OK with this.

????

Jim K

On Sep 18, 1:07*pm, fred wrote:

Once drafty windows are replaced, condensation may occur.

With decent DG units it may occur somewhere other than on the windows,
depending how cold the walls/ceiling are.

MBQ

"The Natural Philosopher" wrote in message
...


The requirement is all about ventilation. How you achieve it is your
business, as long as the BCO is happy.

Its idiotic, BUT as long as there exists so many square mm of vent to the
outside world above height X the regulation is satisfied.


Yep I have a new house and no trickle vents fitted ... met requirements
elsewhere.