dpmiller

the concrete part of our shared lane was apparently 35N with fibres and no mesh, it's showing no damage after ten years of farm traffic.

Oh yes. And you don't quite realise just how much real estate is taken up by panels, trays, and flashing.

Does this help @Conor?

we used 6x1 treated rather than multiple battens

Both immersions could well have failed...

Not liking the look of that insulation

That's a nice advert you've got there....

but then they're in the house, not in the frame...

relies on the pump punning continuously I'd guess. It's one thing water expanding as it cools, but a small fixed pocket of water freezing might be something else...

Unpossible. Stupid hateful noisy things don't ya know?

did you forget the fit the guide?

the door is basically a sheet of 30mm PIR with timber edging and hardboard cladding IIRC

I fitted one of these, are you looking for something better-insulated? https://www.keyliteroofwindows.com/products/loft-ladders/

those dewalt angle drives are great aren't they?

Mine sits on flexifeet, on an extended step at the back door. There's a rear-entry gully there which gets some of the condensate. I also isolated the step from the wall of the house with a sheet of polystyrene before the pour to be doubly-sure of no vibration transfer...

It doesn't. But Insulation *over* the slab with UFH in a screed or board above will be more responsive.

I fear most trade merchants live off the back of the big contracts. Accounts with the Councils, Govt departments, big manufacturing etc. Cost not an issue, discounts not requested... Similar online too. RS Components have a massive stockholding and excellent response. As do Farnell. But CPC is just another arm of Farnell and they sell most of the same stuff but cheaper. The first to are go-tos for the Agencies and Industry, the other where trades and retail go when they can wait a day or two for stock...

Anti-scalding protection can be a single thermostatic mixer at your hot tank (most come with it as standard now) but many here will counter that Legionella controls are unnecessary in a sealed system full of hygenic water...

Ignore it?

do the whole step with whatever made the stain

have you checked for "other brand" options or just BG?

tried reversing the clamp?

No reason why not. It looks like the smaller of two standard sizes so something like this: https://www.ebay.co.uk/itm/123755047151?hash=item1cd06028ef:g:n9gAAOSwtxNczJm9

there's a grille on the underside of the circled bit. it blows "down" onto the tiles.

That is indeed a fact, especially when the RH is high. Which is why there is a defrost cycle. Which still results in an overall COP greater than 1.?