Onoff

Two schools of thought, a bigger gap will drain, get air to the back of the timber etc. Too tight might encourage say wasps and or get full of damp retaining crap. I'll cut the tubes to whatever you want.

So how many studs does he need in total? I've some stainless flat bar here. I could knock up some square washers at least for the rear, between spacer and ledger.

Mice is all ours will catch! Amazed it can move that fast tbh:

So is it 40/50/60mm spacers if 2" high "waves"? Could print some in PETG...

The conduit spacers keep the back of the ledger away from the wavy wall face. As long as you keep the drill reasonably on the level when you drill it'll all work out. The big square washers go between the end of the conduit and wall side of the ledger. That'll help stop any "rock". Tbh the ledger will naturally "bend" vertical. I'd pre drill the cut to length ledger with 14mm holes for the M12 studs. (You need to work the spacings out so they miss your 150x50 joists). I'd then prop the ledger up on some timbers and get it dead level. Drill through the ledger with a 14mm masonry bit just to mark the wall. Take the ledger down and drill thru your render with a sacrificial 20mm spade bit . Drill into the block with a 14mm masonry bit, go 80mm deep. Use a puffer to clean the holes out. Pump resin into the 80mm hole, push the M12 stainless stud in and slip in the 19mm OD X 40mm long stainless spacer. (I'll pre cut these here for you and post if you want). Leave for the resin to set. At this point I'd go around the spacer where it projects out of the render with say CT1. Slip on square washers over the stud, against the spacer then put the ledger on. You'll likely need help to do that. You might need to open up the odd hole in the ledger.

He's already got the neighbours complaining he attracts rats. Just slings his food scraps and tea bags out the bag door into the concrete!

I see joist hangers have been advocated. Quick and easy. Me being me.....I'd probably get the router out do through housings and glue and screw, literally make a ladder beam. Might even do stop housings and have the wall plate and front one a bit deeper...

Then @PeterW's idea for building the front legs on the floor then pushing / pulling up vertical: You could do it with a mate or even a rope from an upstairs window.

Something like this for the wall plate detail:

A freestanding step, he'll likely shuffle, wedge his foot under in then fall upending that and buggering his ankle. It'll work something on the lines of a grab handle on the wall between frame and external socket. With help he lifts one foot over the threshold onto the new plinth. Then he grabs the new handrail, shuffles and puts a foot onto the ground. Rough thoughts are this at the moment (quick sketch with a Sharpie in a newspaper). Stainless studs resin'd into the existing concrete. Existing concrete scabbled and primed with SBR. Step cast. He's a grabber when he falls so will take anything nearby with him. Similarly he will grab anything to haul himself back up. That handrail has got to be as strong as, maybe even one either side. I'll have to have a rummage as to what Tube Clamp fittings I have. One of his ailments is postural hypotension. This coupled with hearing / balance issues means he's very unsteady going from one "level" to another. Just the act of going up/down a step height can end in disaster. Of course, with the time I take to do anything this could all be moot... 😉

My Dad is pretty much housebound and only able to walk short distances. Even negotiating a step is a mission. Various mobility issues! He can "walk" but with a frame etc. My brother has had the idea to put a step just outside the back door to halve the height of the step out from the kitchen. This so Dad can "sit out the back for a bit". Now the ground height to damp course has always been a bit compromised but seeming never caused issues. From the concrete to underside of step is 130/140mm. The boiler pipe runs under the step too. My brother's idea was to cast a plinth against the house. I said bad idea ref the damp course etc. My thoughts were cast it away from the step a tad. I'd wire brush / clean then SBR the existing concrete. Need also to incorporate a grab rail. Similar to the reflection in the first photo of one I did him years ago. Thoughts? Cheers

Right, tube wise I have 19mm OD / 15mm ID. Then 1" OD / 7/8" ID. Both stainless: Tbh the smaller one might actually be Imperial too... 😂 On the washer front, all I have in a big dia is bright zinc plated on the right. On the left is a thick form, 2.5mm thick, M12 stainless washer but standard diameter. In the middle, an M12 thick form, stainless spring washer. I'll look again tomorrow.

I'll go have a look either now or in the morning. I could easily post him some pre-cut

What size studs? I've some 3/4" nom bore, heavy wall, stainless tube here I think. Would save painting, wouldn't rust etc.

Yes, 150x50 is a bit of 6"x2" timber

Read my reply just now.

Scaffold poles are 48.3mm diameter. Buy a 50mm dia wood bit and drill up the middle of the 150x150 leg. Drill 100mm deep. Slip the 450mm length of scaffold up in the hole, you'll then have 350mm of pole sticking out from the bottom of the post. Forster bits are nice tools. You might be able to get a cheap, 50mm, flat wood bit instead. https://www.amazon.co.uk/6-50Mm-High-Carbon-Woodworking-Durable-Sets-45Mm/dp/B0849Y1Q83/ref=mp_s_a_1_4?

I'm going to cheat. I feel the beans need a "boost": Says 1/2 cap to 1L of water but how much then does each plant "get"? Maybe just 100ml each then the next? On the good news front, since I added the ash layer to the runners in the pot, the slugs and snails seem to have reduced dramatically. Hopefully a feed will help the plants repair some of the damage. The runners in the enclosure, with the ring fence of ash and beer traps, haven't been touched.

Do you have UHF, is that drying the trap out?

Lion / tiger poo is supposed to work well too. I recall that freshly shed snake skins placed in the loft seemed to scare the mice away.

Wood ash, scattered atop the soil in the runners pot seems to have worked. Looking at 4am this morning, it's been raining and there's slugs on the ground, no critters on the plants in the pots. (They seem to prefer the runners over the dwarf beans for some reason). Speaking with my brother and he reckoned nettle fertiliser takes about 6 weeks to brew then you dilute by 10x.

Deleted.

Right then, tonight, bloody great snail munching on the runners in pot! No snail trail up the side or over the rim. Where does it live, under the dirt in the pot during the day? Is it worth sprinkling wood ash over the soil?

A bigger vacuum lifter?

& doesn't leak!