Should I have cavity wall insulation?
- Thread starter JamesEB
- Start date
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According to government findings its a good & successful idea for the majority of houses that have had CWI installed under the government schemes.
You will have to do much research to come to your own conclusions.
The initial survey is the key to having any chance of a successful installation - there are many factors the surveyor should take into account. Perhaps research these factors as a checklist?
The installers have to be diligent and trained or experienced.
The material should be good quality polystyrene beads - but thats only my opinion FWIW.
You will have to do much research to come to your own conclusions.
The initial survey is the key to having any chance of a successful installation - there are many factors the surveyor should take into account. Perhaps research these factors as a checklist?
The installers have to be diligent and trained or experienced.
The material should be good quality polystyrene beads - but thats only my opinion FWIW.
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Evening James
I had CWI installed courtesy of a scheme.....it cost me £150. It's the blown in wool type - I wasn't given any choice. The work was done by a firm called the Mark Group.
The work was well done...all the drilled holes were filled, and the air bricks checked to see if the need ducting or not - they didn't.
All I can say is that the house is warmer, and there is evidence of the wool getting where it should be.
My roof and soffits are in excellent condition, I wouldn't have considered it otherwise.
I'm unaware of the pros and cons of wool versus beads I'm afraid.....for sure, whatever material is in there it's there for keeps.
I would have it again....but naturally enough your loft insulation is more important as a first step.
John
I had CWI installed courtesy of a scheme.....it cost me £150. It's the blown in wool type - I wasn't given any choice. The work was done by a firm called the Mark Group.
The work was well done...all the drilled holes were filled, and the air bricks checked to see if the need ducting or not - they didn't.
All I can say is that the house is warmer, and there is evidence of the wool getting where it should be.
My roof and soffits are in excellent condition, I wouldn't have considered it otherwise.
I'm unaware of the pros and cons of wool versus beads I'm afraid.....for sure, whatever material is in there it's there for keeps.
I would have it again....but naturally enough your loft insulation is more important as a first step.
John
There is a retired builder who likes to write scare stories for one of the newspapers, who writes all manner of claims about CWI, and would have you believe that vast numbers of houses are suffering problems with it. He seems to believe that CWI actually creates water.
I find his statistical analysis very unconvincing, and he seems to think that houses are intended to be ventilated though papered and plastered brick walls, rather than say, open windows. But it sells papers, eh?
I find his statistical analysis very unconvincing, and he seems to think that houses are intended to be ventilated though papered and plastered brick walls, rather than say, open windows. But it sells papers, eh?
I guess if your walls are porous - for one reason or another - CWI could allow water to pass irrespective if it was wool or beads.
My house is partly Northumbrian sandstone ( notorious for it's porosity) and partly pebbledash.
All pointing is sound, and the stone has been treated with a Waterseal type compound (can't remember the name but it was three times the price of Waterseal.)
So far so good! No evidence of damp anywhere - and there wasn't before.
John
My house is partly Northumbrian sandstone ( notorious for it's porosity) and partly pebbledash.
All pointing is sound, and the stone has been treated with a Waterseal type compound (can't remember the name but it was three times the price of Waterseal.)
So far so good! No evidence of damp anywhere - and there wasn't before.
John
You really should consider the purpose of the cavity before having it filled. If the cavity provides ventilation to e.g. the roofspace, then filling it with insulation will prevent it from providing this ventilation, therefore you would have to consider soffit vents or similar if your eaves allow it.
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Might not be designed that way but I'm sure you've seen enough rotten timbers in old houses to know that every little helps in keeping things dry! And frequently doesn't!
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