In france parpaing are a really cheap option but I can’t find any here in the uk.
I’ve tried a few different search and shop that sell masonry supply but can’t find them.
What am I missing. I’m pretty sure I saw some of those when we did build the walls in the space.
“215mm hollow concrete blocks” googles well
That multiple-hollow style on the fr wikipedia page isn’t common over here though. On the continent you can get away with a single skin of those multi-cell blocks and not really need insulation.
Two voids like we had in the space is typical in the UK, where the only real purpose of the voids is to make the blocks easy to handle.
Whoua those are almost 4 times the price of the one you’ll get in france 
http://www.leroymerlin.fr/v3/p/produits/parpaing-creux-20x20x50-cm-e165480
when ask for location put 68170
blocks and bricks are expensive
Wine or bear bottles?
Yeah they’re intended for much heavier use.
What are you building?
Planning to build a raised deck in the garden. I know the general approach is to dig hole for wooden post (rough cost estimate of £400 for the post) but I thought hollow block are cheap and if building the resting block of the frame with them it could have saved me a lot of money.
£400 for a wooden post?!
Bag of premixed concrete: £10
Steel socket & 4 screws: £10
Piece of fence post: £2
One at each corner, so £88 for the lot.
Unless I’m missing something?
size of the deck being at least 7x4 meters and the ground as an incline close to 60cm from one end to the other. Please if you can share where you saw the fence post that’ll be great
Just about anywhere, really.
http://www.wickes.co.uk/Products/Gardens/Fencing/Fence-Posts/c/1000700
100x100, 2.4m for £15
Should do you all four corners. Might be worth putting some diagonal bracing on the longer legs.
EDIT: Ah, 7x4 is pretty big, so maybe you want 9 legs instead of 4? Still can’t see how you’d make it up to £400…
Sorry my bad, seems to have misunderstood the number of legs I needed when I did my first calculation.
Than if I understand you correctly I could have 9 post spread around as shown below
x------------x------------x
| | |
x------------x------------x
| | |
x------------x------------xYou can also save by not using concrete. The ground is supporting the structure ultimately, and concrete makes future work a PITA plus my experience is that timber surrounded by concrete rots more quickly.
lol my drawing look ridiculous
Yeah, a concrete block on a suitable firm base will do well
I don’t know why anyone would ever embed wood in concrete when you can drill/screw on a steel socket.
is that the steel socket spike you mean?
http://www.wickes.co.uk/Wickes-Wedge-Support-Spike-for-100-x-100mm-Posts/p/540564
Nah, that’s for driving a fence post directly into soil. Good for not falling over, but terrible for not sinking into soft earth. You want
http://www.wickes.co.uk/Wickes-Bolt-Down-Post-Support-for-100-x-100mm-Posts/p/218589
and some
http://www.wickes.co.uk/BP-Fischer-FXA-Throughbolt-8x91-Pack-of-4/p/141031
to fix it down (although you could probably get away with wimpier fixings given that you won’t be seeing the same bending force as a fence in the wind)