Adrian Walker

Lewis decking is a good idea, but it won't need UFH. I wouldn't use air to heat the house, it's a poor way to put heat into the slab. You want a uniform and constant temperature that only UFH can provide. I have visited a certified passive house that didn't have UFH, it's was a disaster.

You should be looking and considering an insulated concrete slab with UFH. UFH pipes can be used to both distribute heat and cool.

There are no benefits or advantages in DC light systems in a residential property. LEDs might be DC, but the drivers and controllers are relatively cheap, reliable and available. Overall I2R losses make it inefficient.

In Scotland and in the North of England they often don't use cellular, instead, they connect via a dedicated Long-Range Radio network at 400MHz which travels futher.

Do you have any mobile phone signal at all? If so you can ask for an T3 External Aerial to be added to a smart meter. I wouldn't take no for an answer, the national network (DCC) is required to cover 99.25% of all premises. Demand a Technical Site Survey or a physical visit. Tell them you want an engineer to test the signal at the actual meter point, not just a desk-based estimate. Additionally, when a meter is faulty or reaches the end of its life, the law states the supplier must replace it with a smart meter unless there is a valid reason not to.

Flitch beams are generally only supportive in one direction. Bifolds will have a torsion load.

I understand that it was in jest, based on the comments 🙂 However, you should never engage any professional based solely on price.

I think that's a bit harsh, especially as we have several professionals on Build Hub.

It’s similar to a machine surface symbol.

I presume that you have photographic proof of the construction by the builder?

An architect should be struck off for saying that.

Agree with your comments. This cable, as the name suggests, is for an EV charger of less than 20 metres, for voltage drop reasons. It was designed so that an EV charger only needs one entry point for data and power.

The Doncaster EV-Ultra cable contains four twisted pairs, more than enough for clamps and data

It’s CO2 that you need to measure and monitor

Or use Doncaster EV Ultra that has CAT5e inside https://www.yesss.co.uk/ev-ultra-cat5e-cable-4mm2-3-core-data-pvc-steel-wire-armour-black-0 They do a 6mm2 and a 10mm2 version.