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 ********