Joined: May 2019
||Posted: 12 May 2019,23:51
I've been following this wonderful site's instruction in the design & build of a circular (2.2m diameter) crazy paved patio using Victorian era Yorkstone salvaged (with permission!) from a skip across the road.
I'd like to sanity check (ho ho) my plan and have some questions about jointing.
As per the crazy paving section, I'm not using a sub base as it's just a light use patio. The ground here is quite sandy, well drained and stable. I don't have a tamper but will compact it the best I can.
I'm planning on 50mm bedding with 10:1 sharp sand and cement, semi-dry.
The Yorkstones vary in thickness but most are around 35-40mm.
It's going to be edged in two ways. Front (to grass) - edge laid reclaimed red and blue bricks on same bedding as the Yorkstone. At the rear, the same reclaimed red and blue bricks but laid on edge in a sawtooth pattern to form a raised barrier to the topsoil at the back, which is at a slightly higher level than the lawn.
Photo with a test layout below.
Will I be fine without a sub-base?
50mm of 10:1 bedding sufficient? As I've slightly over dug the hole, might be more like 60-70mm in places once compacted.
Jointing - I want something black, was thinking about vdw 840+ Basalt. But reading the information PDF there were a couple of contra-indications. I've tried to keep the joints to ~20mm, but obviously there are inevitably some joints / areas much bigger than this eg ~40mm. vdw 840+ spec suggested 20mm max width.
Also the 840+ spec suggests bedding must be permeable. It's not clear from the Bedding page if 10:1 is permeable or not, my guess is probably not, due to the cement once it's gone off. Given the quantity of water, I'll be using feel like that could be a problem.
A recent comment of Tony's suggests one part polymerics are no longer recommended (like the 840+ ?). What's the best alternative?
The Yorkstone is well weathered and quite rough. I really don't fancy my chances with cement based wet grouting, can't help but feel it will end up very stained. I've not mortared anything on this scale before.
Should I wait for the bedding to go off completely before jointing?
And final questions, the brick edging - should I make the bedding deeper or think about concrete & haunching? Presumably I should do the edging first?
Thanks in advance for any advice.