I recently enquired about having cavity wall insulation installed
through nPower. As a result of my enquiry I was called by someone from
Rockwool. Amongst various other questions, I was asked if I want
traditional Rockwool or 'white wall'. Apparently white wall is a newer
product that's better at filling the cavity. It has the same u-value
as Rockwool but is installed through slightly smaller holes. There's
no difference in the cost because I'm eligible for a 100% grant for the
job.

I've had a look around the Rockwool website but can find no mention of
this 'white wall' product. Anyone know what it is? I initially
thought it might be the old polystyrene bead product, but apparently
Rockwool don't use that anymore.

Once I receive Rockwool's written confirmation of the details of the
job I might call them back for clarification as to why I can't find it
on their website. In the meantime it would be useful if anyone knows
what this product is, or why they apparently offer a choice of two
different products.

Thanks,

Mike

MikeH wrote:
I recently enquired about having cavity wall insulation installed
through nPower. As a result of my enquiry I was called by someone
from Rockwool. Amongst various other questions, I was asked if I want
traditional Rockwool or 'white wall'. Apparently white wall is a
newer product that's better at filling the cavity. It has the same
u-value as Rockwool but is installed through slightly smaller holes.
There's no difference in the cost because I'm eligible for a 100%
grant for the job.

I've had a look around the Rockwool website but can find no mention of
this 'white wall' product. Anyone know what it is? I initially
thought it might be the old polystyrene bead product, but apparently
Rockwool don't use that anymore.

It's white fibreglass, all fibreglass is white and they add dyes to make it
yellow or pink for loft insulation or cavity batts, but blown CWI
fibreglass is white...rockwool is the colour of cement, sort of like a
browny-greenish colour, this is made from rocks, hence the name....neither
glass nor rock actually do any insulating, it's the air trapped between that
does that, the same with polystyrene.
Having worked as a CWI installer for a long time, I can tell you that both
work equally well.



Once I receive Rockwool's written confirmation of the details of the
job I might call them back for clarification as to why I can't find it
on their website. In the meantime it would be useful if anyone knows
what this product is, or why they apparently offer a choice of two
different products.

There is little difference in the end result but rockwool is more expensive
because it's not made in the quantities that fibreglass is, the one that is
most often used is Supafil, even if it comes in a different package or under
a different name, given that they make tonnes of the stuff every day and
sell it to other insulation companies....you can DL a PDF on it he
http://www.knaufinsulation.co.uk/out.../page_142.html