It is an old idea, curently getting a bit of a revival. It is a cost
effective option for larger commercial buildings, or where internal work is
to be avoided.
The insulation is glued or mechanically fixed to the external wall, and then
a render, or brick slip coating is fixed to give the weather resistance.
I can't recall any names, but their are a good few propiatary systems
available. Do a google search.
You may need building and planning approval.
100mm rockwool type slabs held on the bighead bonding fasteners and galv
steel perf matting to hold the polythene sheeting over/give a good surface
for the render to stick into, rendered over with a water proof layer
painted with sandtex....
Thats how a lot of new build (rebar/concrete walls) here is now being
I got my HNC Electronics at East Park Terrace (Six Dials - close to
where St Marys footie club is today), which I think in recent years
has been awarded University/degree status. Or am I wrong?
30 years ago Soton Uni campus was just off the Avenue as I recall. I
guess it is still there.
of degree's that is also being talked of by those with more knowlege of
the place) that has caused the Uni to ensure when it re-branded itself
it was clearly "The University of Southampton", so its not so easily
confused with "Southampton institue, a university sector college", as
most people only read Southampton and university loosing the institue,
sector and college....
and the Winchester school of art (another site that may also be closed).
On Wed, 01 Oct 2003 19:10:34 +0100, email@example.com wrote:
Gosh, showing my age a bit here. La Sainte Union was a girls school 30
years ago wasn't it? Never did know much about it, but there were some
girls from the school who used to travel on the same bus as me into
Southampton as I recall.
Somewhere at the end of the Avenue if memory hasn't totally deserted
me after all these years.
Interesting. Let me see if I have this right:
- layer of rockwool
- layer of polythene
- layer of steel mesh
But isn't the surface too flexible and the render would crack if
something fell against it?
Its basically similar to my house actually.
Mine is , from the inside
Marine ply cladding for extra structural strength
Airgap/battens (open at house base)
Render mesh with drip bead at base
Its something you COULD smash with s sledge allright - in fact a sledge
would get you into the house in under 20 minutes I reckon :-) but its
tough enough for weather and laning bikes against etc.
I think its about 75mm of render in all.
brick and is facing the North Sea!!
Looking around the various manufacturers on the net most seem to use
polystyrene held on to the walls using expanded metal mesh and studs /wall
bolts, then plastered over. They claim this meets various fire standards.
If you look at the knauf insulation site they have a description for using
their cavity board in this way.
If you wonder why we are going for external it's because, the bricks are old
reds going soft and absorbing water in the winter, all the rooms have fancy
plaster mouldings round the ceiling edges and I don't wish to lose room
space as the biggest is only 14 ft Square.
I'd say you are onto something then.
Just be careful about any damp getting into the bricks: It won't
evaporate out with a huge wedge of styrene over the top. If you have a
naff DPC, or no DPC, you couild end up with it evaporatng inwards. Nasty
efflorescence and crumbling plaster.
Likewise look carefully at how you seal teh top against leaky guttering etc.
Unless you already have a big overhang on the roof, you may need to
extend the roof somewhat as well.
BUT, coupled with new DG windows (you will need to move windows out, or
put a secondary frame anyway) on the face of it it sounds like a recipe
for instant cosiness. Do the reserach, and if satisfied the
window/door/roof and damp issues are all satisfactorally sortable, I'd
say go for it.
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