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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Wall cavity insulation
Hi,
A friend of mine is having cavity wall insulation done. She had a company come in to get an estimate and she was told that as she had an open fire she would have to pay an extra £60 for the installation of a core vent. When she questioned this she was told that it was the law. Could someone tell us if this is the case or if the guy was just trying to get the most out of her. Thank you for your help. |
#2
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Wall cavity insulation
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#3
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Wall cavity insulation
Christian McArdle wrote:
A friend of mine is having cavity wall insulation done. She had a company come in to get an estimate and she was told that as she had an open fire she would have to pay an extra £60 for the installation of a core vent. Yes, open fires need ventilation in order to avoid the production of poisonous carbon monoxide and to prevent the exhaust fumes spilling into the room. I've got one of those horrible vents in my front room. Not only is it horrendously ugly, but it also allows enough cold air in to make an energy efficiency a mockery. I usually contrive some way of blocking it up. I might go for squirty foam as a more permanent solution. We don't use the fire. Christian. The BEST way to ventilate a fire is with underfloor ducting to the fire itself. Wall vents are vile: they admit as much cold as air. |
#4
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Wall cavity insulation
On Wed, 26 Jul 2006 11:55:19 +0100, "Christian McArdle"
wrote: | A friend of mine is having cavity wall insulation done. She had | a company come in to get an estimate and she was told that as she | had an open fire she would have to pay an extra ?60 for the | installation of a core vent. | |Yes, open fires need ventilation in order to avoid the production of |poisonous carbon monoxide and to prevent the exhaust fumes spilling into the |room. I've got one of those horrible vents in my front room. Not only is it |horrendously ugly, but it also allows enough cold air in to make an energy |efficiency a mockery. I usually contrive some way of blocking it up. I might |go for squirty foam as a more permanent solution. We don't use the fire. And when you sell the house, or move out? Far better to get rid of the open fire and install central heating with a combi room sealed boiler. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#5
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Wall cavity insulation
wrote:
Hi, A friend of mine is having cavity wall insulation done. She had a company come in to get an estimate and she was told that as she had an open fire she would have to pay an extra £60 for the installation of a core vent. When she questioned this she was told that it was the law. Could someone tell us if this is the case or if the guy was just trying to get the most out of her. Thank you for your help. ================= If your friend's floor is floorboards (not concrete) and there is an air brick on an external wall ventilating the under floor space then she could ask if a floor vent can be fitted instead of having a 4 inch diameter hole bored through the wall. As far as I am aware the regulations still permit this. |
#6
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Wall cavity insulation
On Wed, 26 Jul 2006 14:14:58 +0100, "Christian McArdle"
wrote: | Far better to get rid of the open fire and install central heating with a | combi room sealed boiler. | |It is an Edwardian property. Removing a fireplace in our street is |considered not much better than kiddie fiddling. The heating is already |provided by radiator. Then block off the *chimney*, just above the fireplace, and leave the fireplace as a feature. Because you will no longer be able to use the fire, you can also block the vent. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#7
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Wall cavity insulation
Then block off the *chimney*, just above the fireplace, and leave the
fireplace as a feature. Because you will no longer be able to use the fire, you can also block the vent. Indeed. That is what I was proposing, although I didn't mention the chimney. The back room ones already have the chimney sliced off anyway, due to the loft conversion coveting the space. Christian. |
#8
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Wall cavity insulation
Dave Fawthrop wrote: On Wed, 26 Jul 2006 11:55:19 +0100, "Christian McArdle" wrote: | A friend of mine is having cavity wall insulation done. She had | a company come in to get an estimate and she was told that as she | had an open fire she would have to pay an extra ?60 for the | installation of a core vent. | |Yes, open fires need ventilation in order to avoid the production of |poisonous carbon monoxide and to prevent the exhaust fumes spilling into the |room. I've got one of those horrible vents in my front room. Not only is it |horrendously ugly, but it also allows enough cold air in to make an energy |efficiency a mockery. I usually contrive some way of blocking it up. I might |go for squirty foam as a more permanent solution. We don't use the fire. And when you sell the house, or move out? Far better to get rid of the open fire and install central heating with a combi room sealed boiler. -- We had one of those vents, and I noticed the previous owner had blocked it with a piece of hardboard screwed over the top. But we recently had the fireplace completely removed and the wall re-plastered, which covered the vent. Although this solution may be a little extreme for the OP. |
#9
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Wall cavity insulation
"Christian McArdle" wrote:
In fact, our back room has such a vent for its old fireplace and it is much superior to the front room wall vent. The front room vent is capable of producing hurricane force cold winds in winter. Christian. Yes, my experience exactly. Dining room has floor ventilation and is hardly noticeable in winter. Lounge has 4 inch diameter wall hole ventilation and it would be like sitting in a cold store during winter but for the fact that I block it off. |
#10
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Wall cavity insulation
If your friend's floor is floorboards (not concrete) and there is an air brick on an external wall ventilating the under floor space then she could ask if a floor vent can be fitted instead of having a 4 inch diameter hole bored through the wall. As far as I am aware the regulations still permit this. Nobodies asked so I will, what is this to do with cavity wall insulation?. Does this replace an existing vent or do they make a new hole? Dave |
#11
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Wall cavity insulation
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#12
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Wall cavity insulation
"gort" wrote in message news If your friend's floor is floorboards (not concrete) and there is an air brick on an external wall ventilating the under floor space then she could ask if a floor vent can be fitted instead of having a 4 inch diameter hole bored through the wall. As far as I am aware the regulations still permit this. Nobodies asked so I will, what is this to do with cavity wall insulation?. Does this replace an existing vent or do they make a new hole? Sorry, I didn't read this post before I asked. When we had cw insulation it was never brought up. We don't have open fires (i.e. solid fulel) but we have gas fires in two rooms and they need air just the same. We weren't asked about fires at all. Mary Dave |
#13
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Wall cavity insulation
On Thu, 27 Jul 2006 11:16:57 +0100, "Mary Fisher"
wrote: |I'm guessing here, but I would think he is reffering to the need to |have a vent in the room to provide air so the fire can draw properly. | |But what difference would cavity wall insulation have on ir gong into a |room? Bunging up the cavity with fiber will reduce draughts round joists, between floors and under floors. At least my filling my cavities with foam did that. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#14
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Wall cavity insulation
But what difference would cavity wall insulation have on ir gong into a
room? It can reduce the amount of natural parasitic ventilation below a safe level for an open flued appliance. Christian. |
#15
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Wall cavity insulation
We where asked to sign a disclaimer saying we didn't have any gas or open
fires when we had our walls done a couple of months ago, we where also sent a 10yr guarantee shortly afterwards. Pete |
#16
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Wall cavity insulation
Mary Fisher wrote:
"gort" wrote in message news If your friend's floor is floorboards (not concrete) and there is an air brick on an external wall ventilating the under floor space then she could ask if a floor vent can be fitted instead of having a 4 inch diameter hole bored through the wall. As far as I am aware the regulations still permit this. Nobodies asked so I will, what is this to do with cavity wall insulation?. Does this replace an existing vent or do they make a new hole? Sorry, I didn't read this post before I asked. When we had cw insulation it was never brought up. We don't have open fires (i.e. solid fulel) but we have gas fires in two rooms and they need air just the same. We weren't asked about fires at all. Mary Dave I have had three estimates for cavity wall and loft insulation recently. One gave no information, the second was very informative the third a little info. The informative one checked the fire, said as it was below X KW output (forgotten the figure) it was ok. He also said that as I had 2 vents, one for a toilet the other in the cloak room when the installers came they would check that they were sleeved core vents, if not they will charge £45 to replace them. Also to thoroughly check where all cables and pipes pass through the walls that both inside and out are sealed to prevent the insulation escaping. As his price was only a couple of quid above the cheapest he will get the job. |
#17
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Wall cavity insulation
"Christian McArdle" wrote in message ... But what difference would cavity wall insulation have on ir gong into a room? It can reduce the amount of natural parasitic ventilation below a safe level for an open flued appliance. :-) Can we have that in English, please? Mary Christian. |
#18
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Wall cavity insulation
On Thu, 27 Jul 2006 16:07:14 +0100, "Christian McArdle"
wrote: | It can reduce the amount of natural parasitic ventilation below a safe | level for an open flued appliance. | | Can we have that in English, please? | |You might be still alive because the room is getting air through holes in |the cavity wall (probably below floor level). When you fill the cavity wall |with foam, those holes will be blocked, the air won't get to the fire and |you will die a slow and lingering death. Which is what I said in simpler terms in another post. Thanks :-) -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#19
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Wall cavity insulation
Which is what I said in simpler terms in another post.
Thanks :-) Indeed. I posted my original version before yours appeared. My latest epistle was in response to a request for translation. ;-) Christian. |
#20
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Wall cavity insulation
On Thu, 27 Jul 2006 16:37:54 +0100, "Christian McArdle"
wrote: | Which is what I said in simpler terms in another post. | Thanks :-) | |Indeed. I posted my original version before yours appeared. My latest |epistle was in response to a request for translation. ;-) I might have asked for a translation if Mary had not got in first ;-) -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#21
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Wall cavity insulation
"Christian McArdle" wrote in message ... It can reduce the amount of natural parasitic ventilation below a safe level for an open flued appliance. Can we have that in English, please? You might be still alive because the room is getting air through holes in the cavity wall (probably below floor level). When you fill the cavity wall with foam, those holes will be blocked, the air won't get to the fire and you will die a slow and lingering death. The cavity is filled with fibrous rockwool which is blown in, not a solid mass which bungs up every hole! Mary Christian. |
#22
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Wall cavity insulation
I might have asked for a translation if Mary had not got in first ;-)
Surely not, although I have noticed that Mary does appreciate a less sententious reply than some. Christian. |
#23
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Wall cavity insulation
"Christian McArdle" wrote in message ... The cavity is filled with fibrous rockwool which is blown in, not a solid mass which bungs up every hole! If it doesn't stop airflow, then it will be a pathetic insulator, whether it is made of plastic foam, fibres, newspapers or anything else. We noticed a difference from Day 1. I've recommended it to lots of people. We had it done years ago when we had to pay more than the cost today even if you don't have a grant. It's exactly the same system which is being done today, same company too. Mary Christian. |
#24
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Wall cavity insulation
"Christian McArdle" wrote in message ... The cavity is filled with fibrous rockwool which is blown in, not a solid mass which bungs up every hole! If it doesn't stop airflow, then it will be a pathetic insulator, whether it is made of plastic foam, fibres, newspapers or anything else. We noticed a difference from Day 1. I've recommended it to lots of people. We had it done years ago when we had to pay more than the cost today even if you don't have a grant. It's exactly the same system which is being done today, same company too. I'm not suggesting that your insulation doesn't work, just that it WILL block up every hole, or prevent airflow getting to that hole, by preventing airflow within the cavity. I think you're wrong but there's no point in pursuing it. Mary Christian. |
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