umiq88

Looking for some advice on soil pipe routing in a bungalow. Red is sewerage, blue is grey water. Both will end up in on site waste water treatment. I was going to put a stack on the end of the red pipe up through the roof. I was also going to run the blue pipe into the attic and connect into the red stack to vent or else give it a separate vent.

Sorry I'm starting a self build. The way I've seen new builds done is a P-trap feeding into a T. Bottom goes to waste and the top is vented. This means you can't pull a vacuum and empty the trap. S trap is unvented. I'm just wondering how big a deal it is and if required how people run vents up in block walls.

Hi going in to a new build and looking for some advice on drainage pipe in the ground works. Has anyone any useful technical publications or guides to design and fitting? My current house uses S bends on all the sinks directly into an outside gulley (with air break) but the modern approach seems to be everything goes into 4" soil pipes and into the septic system. In this case I presume every trap needs to be P trap and vented? I'll have block internal and external walls so in a bathroom with a sink up against a standard 4" wall how do people run the vent pipes? I could do block on flat and chase a 32mm pipe into the wall?

Don't see why it won't work but is there any downsides? Manifolds will be 10m apart at the same level. Heat source would be buffer tank and oil boiler. Come out of the buffer to blender and pump as normal except the 2nd manifold would be fed from the first.

Hi JohnMo Do you mind sharing your model and supplier? I'm toying with the idea of fitting ASHP instead of thermal solar if its cheaper and switching between the two based on current price. I'm talking average efficiency over the year. Your heat pump is not going to achieve 400% in the height of winter when you need it the most. On the other hand when its most efficient in summer you don't need the heating and for hot water it can't reach the 60degrees required. I'm not here to knock heat pumps I just don't see how they're cheaper to run than oil and thermal panels.

Why 200mm? not disagreeing just wondering if there is a benefit? Insulation is PIR 0.022W/mK. Layout is L shaped bungalow if I install one manifold I will have long runs to get to zoned rooms. I might try stick to 2 manifolds. Is it possible to use 1 pump and mixing valve for multiple manifolds? I was planning on putting in 2 wet towel rails. My plan for hot and cold water was to run 26mm Pex to each bathroom and kitchen. with a small manifold for each for sink/shower/bath. 16mm to sink and shower and 20mm to bath. How do you put cold water pipes below insulation? below that is concrete sub floor? If I sandwich between 2 75mm boards then I don't need to insulation and minor loss of insulation? I presume it's ok to run DHW pipes (Pex) through the screed neext to U/F pipes.

Upfront cost Oil ~ €500 for good quality 2nd hand eq. I have tools and analyser to setup and maintain. AHSP - >€5k I'm sure I can also maintain but don't have the equipment. Running cost Oil ~ 11c per kWhr ASHP ~ electricity here (Ireland) is 44c per kWhr if you assume an average of 200% efficiency then that's 22c. Does anyone have any real life yearly averages for efficiency? My logic is running cost of oil is cheaper and upfront cost is minor. If fuel prices change I can always switch to ASHP. And for any tree huggers out there oil is > 90% efficient, when the wind stops blowing and they burn gas to make your electricity I'd be impressed if you could get more than 60% after everything is factored in. I don't need advice about regs however everything will either be fully compliant or easily converted to be fully compliant. Solar vs PV panels is down to your use and economics. Most people are borrowing money to install more efficient PV panels to charge more efficient electric cars (also bought on expensive finance). Thermal solar is cheap there are a lot of good 2nd hand stuff out there. My in laws have it installed >10 years and they almost never need to heat water for 4-5months of the year.

Looking for some advice regarding design of a new build bungalow. Plenty of experience repairing or adding on small parts to systems but no experience designing a system and want to get the basics right. Please don't tell me to hire a plumber. I have the greatest respect for trade/craft people and what it takes to do good work. I'm competent and have equipment and knowledge to install just not design. 200sqm new build bungalow will be putting in oil fired central heating with unvented hot water cylinder. All heating in underfloor and there is 2 bathrooms (2 showers and 1 bath). The layouts lends itself to 3 manifolds but I can put 2 in if recommended There will be 150mm (2x 75mm) Kingspan TF70 in the floor I was planning on running the cold water pipes through the middle of the insulation and the hot water pipes in the screed. Questions are - How to size boiler and nozzle? - How do I ensure boiler operates as efficiently as possible in condensing mode. - Expected oil consumption for a year (based on average consumption not calculated) Would I get away with 500l tank. - How to size water tank? Will likely be installing thermal solar if funds allow. - How to size pipework? - Read a lot about cycling issues etc plan is to install a buffer tank in 'hot press' to act as airing cupboard and prevent short cycling. How to size this or is there a better solution? Really I want the system to be as simple, efficient and reliable as possible. Least about of equipment etc. however if it would make a difference such as speed control for circulating pump then I would be happy to put in. I understand this leaning into professional advice and if someone has recommendation I would happily pay for the advice. Also any good books/publications for plumbing and central heating in new builds.