Drainage runs, footings, slabs, kerbs and manholes — describe the job and get the kit list, the volumes and the falls before the digger arrives. Concrete, pea gravel and Type 1 worked out, falls checked, trench support on the list.
Free plan, no card needed. Pro is £24/month, with 5 days to try it.
Ask, work it out, buy it, tick it off — each step hands to the next. No app hopping.
"Drain run and manhole Tuesday — what do I need?" The Gaffer lists the plant, the permit to dig, the CAT scan and the trench support question before you break ground.
Fall over the run at 1 in 40, pea gravel for bed and surround, concrete for the manhole base. Each number drops into the right calculator.
Pipe, bends, gully, chamber rings, pea gravel and concrete land on a shopping list with a merchant link on every line.
The run sits on the job's checklist. Tick it as it goes in, share it with the machine driver, photograph it before backfill and invoice the stage.
Free, no account needed. Quantities go straight onto a shopping list.
Drainage Fall
Gradient 1:N → fall over length
Fall over a run at the typical gradient for the pipe type — 1:40 for 110mm foul, 1:80 for 160mm — in millimetres you can set with a level.
Concrete
Volume + bag count for slabs, footings, posts
Footings, slabs, manhole bases and post holes with bag counts and sub-base.
Gravel / Topsoil
Volume + tonnage (UK bulk-bag yield)
Pea gravel, Type 1 and topsoil in tonnes and bulk bags.
AI-generated in under 60 seconds from your job description. Every section editable, shareable, downloadable.
30 years of trade know-how in your pocket. Straight answers to on-site problems, specific to the job you describe — and it reminds you of the bits you'd only remember halfway there.
The Gaffer
Your AI site mate
"12 metres of 110mm foul drain — what fall do I need and how much pea gravel?"
For a 110 with a single WC on it, work to 1 in 40 — that is 300mm over 12 metres, so set the outfall invert and come back up 25mm a metre. For bed and surround, a 450 wide trench with 100 under and 150 over the pipe is about 2 cubic metres of pea gravel, call it 3 tonnes, four bulk bags. Get it inspected before you backfill and keep the photos.
Always verify to current regs. On-site conditions may vary.
Enter the run length, the pipe type and the 1 in N gradient (the typical one is shown per pipe type: 1 in 40 for 100 to 110mm foul, 1 in 80 for 160mm, 1 in 60 for rainwater) and it gives the fall in millimetres and the bottom invert from the top one. It does not work a gradient back from two invert levels; ask the Gaffer for that, and for what Part H expects for the pipe size and the flow.
The groundworker persona references the HSE excavation guidance, NRSWA and shoring practice, and the checklist puts trench support and the CAT scan at the top. You remain responsible for the safe system of work.
Yes. On Pro you share the checklist by link or add the crew to a team, so the plant, the pipe and the permit are sorted before the digger is on the lorry.