Our house had a built in vacum when we moved in, we dont use it we use a Dyson. The coiled up hose takes up more space than a hoover.
We do use it for the cars and in the garage and we did use it last summer to hoover up chafer grubs from our lawn!
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I googled RC30 and got this;
C30 Backfilling of walls and slabs 300kg OPC, 0.5m3
with a high steel content. Sand, 0.75m3 Agg. 6 to 1 mix
http://www.wrg.org.uk/prh/concreting.pdf
I cast my own padstones in situ;
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When I took my chimney breasts out the floor joists were fitted to a frame around the chimney breast. This wasn't even fastened to the chimney breast.
I suggest that you could run a short joist (the width of the chimney breast) across the end of the now too short joists and then fill the gap to...
It's quite easy.
Start at the top and work down!
The only tricky bits are not falling off the roof and making the roof good.
I have removed the chimneys and chimney breasts from all my houses.
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I suggest that you build your new kitchen in the following order;
Remove old units (with a big hammer)
Modify electrics (sockets and lighting) and plumbing positions
Paint walls and ceiling
Replace floor
Fit wall units (easier if nothing below them)
Fit floor units
Fit worktops
Fit...