Re: Cavity wall insulation?

"george" <dicegeorge@hotmail.com> wrote in message
news:hd7oeo$13f8$1@energise.enta.net...
> David J wrote:
>> On Sat, 07 Nov 2009 16:23:28 GMT, "Phil L"
>> <neverchecked@hotmail.co.uk> wrote:
>>
>>> David J wrote:
>>>> Not quite diy, but does anyone have a view (positive or negative) on
>>>> modern cavity wall insulation with foam or granules.
>>>>
>>>> I had a previous house done with insulation foam in the 1970s and I
>>>> had no problems at all - apart from giving myself a problem later when
>>>> trying to drop a TV cable between floors via the cavity.  The foam
>>>> insulation reduced my annual heating bill by 25%, and soon paid for
>>>> itself.
>>>>
>>>> At the time I remember a brief cancer scare in the newspapers about
>>>> homes treated with this foam - but that ultimately came to nothing.
>>>>
>>>> I had assumed that my current house, built in 1997, would have had the
>>>> wall cavities filled with insulation slabs at the time of building -
>>>> but some recent drilling through the exterior walls confirms that I
>>>> was wrong about that. Maybe the current building regulations for
>>>> insulation were not in place in 1997.
>>>>
>>>> David
>>> houses are still being built today without CWI - it's not required if
>>> the u value of the walls can be achieved without it, that is to say,
>>> thermal blocks can be used, coupled with internal drylining can be as
>>> efficient as cavity insulation.
>>>
>>> I'd get it insulated if it were mine - I used to install CWI for many
>>> years and I can tell you that they use fibreglass now, and very
>>> occasionally, polystyrene beads, but these have many drawbacks, not
>>> least when the house comes to be demolished as they never disintegrate
>>> and also knocking holes through creates huge voids higher up the wall,
>>> fibreglass tends to 'stick' better on the rough surfaces of both brick
>>> and block.
>>>
>>> There's grants available via energy suppliers and also it can be
>>> installed for free if you or your spouse recieves any benefits
>>
>>
>> Thanks for that info Phil.  It probably explains a lot, since my house
>> exterior wall construction is as you stated: standard facing brick + air
>> cavity + 100mm thermal block + drywall
>> plasterboard. I have not seen the mu value for this construction, but
>> I presume it can only be improved the CWI.
>>
>> I checked the 'free' CWI deals available, and it looks as if it
>> restricted to buildings constructed between 1924 and 1982. I'll check
>> further.
>>
>> David
> i bought a thermometer gun from maplins,
> you point it at a wall
> and it tells you the temperature.
> useful for showing where insulation is worth doing,
> in my case the top few feet of the walls seems to leak heat through the
> edge of the roof.

The most common point of cold bridging - where walls meet each other, roofs
and the ground.
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