PeterW

You can use elbows in circuits - 16mm ones are fairly common if you look. One at the bottom and one at the top of the step would work.

Either design has nowhere to “park” the bifold doors so they appear a waste of space. Steels won’t be an issue although a cold bridge would be formed which would need careful detailing.

Broadly the numbers for 20mm filter I’ve seen are a pressure drop of 40/80/120Pa for G3/M5/F7 respectively

I have put 30sqm of parquet through a planer to take it down to 19mm which removed the tar and took it to a more reasonable thickness. Its 90 years old so I’m expecting that it should have shrunk by now and stabilised ...

Steel wool and foam, then skim over with filler. Pipe trim over the top will keep it all tidy

I’m upgrading G3 to M5 as you can buy the media fairly cheaply as it’s used for spray booths so you can buy by the roll. It also doesn’t need to be framed the same way as F7 and can usually fit into standard hold down frames. @Jeremy Harris who did you use ..??

Could be the pattern as it has shrunk unevenly across the length vs width.

You need either TimbaLok or these from Screwfix £20 for 50 is about right.

Are the bricks perforated or solids ..? Perfs will split with a bolster and hammer in the time it will take you to set up 6 in a jig. Solids will take a bit more work but most facing bricks won’t take much more effort. Who’s doing the cutting ..??

To do it properly it is going to cost - a lot. Holding upward of 1,000 litres of hot water, preferably at mains pressure, won’t be cheap and because these are individual units you will need to deliver as though it’s all in parallel. When you have 9 rooms and 4 showers you can limit the usage but in this case you need to potentially diversify. Electric showers aren’t ideal, but depending on the building layout you could have attic cold tanks serving the ground floor electric showers. Then the next floor would be mains pressure using either UVC or potentially Sunamp (as per @Nickfromwales this may help as they are small) and this would need good water pressure but it would mean if a flat “ran out” then it would be isolated to that unit. Have you got any floor plans ..??

Gravity won't work here - you will get appalling pressure and tbh you need to ensure the cold cisterns don't go dry which is a distinct possibility in this situation. Why does the owner/landlord want to skimp on conversion costs..?

£8k would get new rads and an external oil boiler - another £1k would add a 250 litre UVC whilst they have it all to bits. I don’t think your saving by going to electric / ASHP will be as much as you think and the RHI will come in less so you’ll take much longer to get the investment back without some serious work.

Not unusual to have flat tanks under static vans - they can be pumped out by a standard suction tanker

it makes no odds - you can break into someone’s house and if you injure yourself due to some reason you can claim ....

Try the NFU or search Field Insurance - as long as it’s still a field and you don’t start any work then it’s fine. £75 - 100 now versus £10k because some snowflake trips on a muddy field is peace of mind ...

Field insurance is about £100 a year.

You can buy repair posts for this sort of situation if the concrete is still intact.

The difference between BSP and BPT is also the thread angle of 55 to 60 degrees which adds to the confusion ....

Yep but wall thickness has changed so now it doesn’t match

It isn’t ... a BSP thread is the outer diameter of the threads minus 1/4”... The 1/2” used to refer to the steel pipe size it would fit but that has changed due to different wall thicknesses etc over time.

Nope - if you are connecting then they inspect the actual joint. You give 24 hrs notice.

So there is 300sqm of blockwork and the 3000 bricks based on that. First two are not far off what I pay for labour - usually add £10/m for detail on soldier heads etc. Last one by my calculation is £65/m to lay blocks ......... even if he includes the materials, he’s well off the mark !!

+1 to the price list

Sandtoft 20/20 would do it and they look pretty good and are a decent price. Worth getting some samples.

Will be 3 days minimum - day to open, day to connect and ST to inspect and a day to close.