"Grunff" wrote in message
...
Lobster wrote:
I'm currently bricking up two doorways in a 4" party wall between two
terraced houses, as part of a project to reinstate the original
dwellings. I did the first one using medium density blocks, which I
lugged back from Wickes myself, nearly stuffing both my back and the
car suspension in the process... a joiner who later surveyed my
handiwork said I could/should have used the much lighter aerated type
instead. Is that right? If so I could at least use those for the
second doorway!

When we had an extension built a few years ago, with a cavity wall, I
remember the builder used heavy blocks for the outer wall and much
lighter ones for the inner - I assumed I'd need the heavier ones for
the doorway.

I've just noticed in the latest Wickes catalogue (page 36) both types
of block are described as "3.5N" - would that be their load rating?


That is their load rating. I would go for 7N high density aerated
blocks. These are slightly more expensive than standard ones, but well
worth it. Any builders merchant will be able to get them for you. FWIW I
used the Thermalite ones, and they were very good.

Thanks. 'High density' and 'aerated' looks like an oxymoron according to
Wickes' terminology but obviously I've misunderstood! Are these 7N blocks
going to be heavier than both of Wicke' offerings?
David