Gone West

That is the water table. When you dig the hole and remove the soil hydrostatic pressure pushes water into the hole in the same way that a spring finds a weak point and comes out.

I have a ground floor stack for a single toilet and basin that has a 50mm AAV and it's worked fine for three years and the BCO didn't say anything about it.

I agree, but not everyone is so lucky.

I would remove the door and frame and use concrete blocks tied to the existing wall to fill the hole.

There have been several prior approval applications for Class Q GPDO around here where it's quite relaxed and depending on your LPA you might get away with the Class Q conversion taking more than three years but I wouldn't rely on that. It's clear in the regulations that if a Class Q prior notification application is approved the applicant has three years to complete the conversion. With a planning permission the applicant has 3 years in which to start the conversion and once started can take as long as it takes to complete it. A full planning application would assist overcoming this strict and very tight build schedule but could be more hassle.

I designed our system and there were no problems with BC.

Our house has 350mm of Icynene in the walls and roof and the smell disappeared a day or two after being installed.

Correct, but that's what I found, in that Engineers seem to have their own vocabulary for fixings and the the rest of the world use different terms. Other than Engineers if it's got a self tapping thread, it's a screw and if it's got a machine thread it's a bolt. If it's got a self tapping thread it's got a point on the end. It doesn't seem anything to do with the type of head, or length of thread except for Engineers who can call similar fixings, bolts or screws because they have different heads.

When doing it on brickwork it chips off all the distemper and leaves a surface ready for plastering.

In our last house we had distemper on the brickwork of one wall which we wanted plastered so we used a scutch hammer with a wide comb.

Something odd going on.

If the flow temperature is 54C and the bare floor temperature is 23C then it seems to me that there is a lot of heat being lost downwards. An explanation for that, is as you suggest, that the sound insulation is preventing much of the heat from reaching the floor. It would be useful to have a drawing or details of the whole of the floor construction.

There doesn't seem to be a consistent definition on the internet although the fact that a screw has a self tapping thread and a bolt has a machine thread is often mentioned. So the length of thread on the shank seems irrelevant. "Although coach bolts and coach screws are distinct components in their own right, the two do share a number of similarities. The most notable similarity is the head shape, which is domed, or mushroom-shaped, in both instances. Both coach screws and bolts are also best suited for use with wood." "However, a key difference is that coach screws feature a self-tapping thread. This means that these screws can create their own threads in timber, ensuring a more seamless installation. On the flip side, carriage bolts have a machine thread, meaning that they always need an adequately-sized pilot hole to be drilled into the material before installation."

If it's threaded with a point on the end it's a screw, without a point it's a bolt.

Our windows are grey, RAL 7037, inside and outside with the window board and paintwork white and the outside sill matching the windows.

A very true statement. I hope you manage to get it sorted to your satisfaction. We had a tall narrow window opening in our hall, which was supposed to be central, put offset and we made them alter the timber frame so it was in it's correct position. You have to be watching them like a hawk all the time, very stressful.

I looked into ST when I was designing my house. Didn't think it was worth it for me because roof access would have been difficult but I thought the drain back system was good. https://www.viridiansolar.co.uk/resources-3-6-solar-thermal-plumbing.html

Why can't you rest it on the purlin with a standoff tied to the purlin.

Although he hasn't used it as much in the winter as the summer the heating is left on all winter because the temperatures are so low. He just does what the locals do.

My mate has a holiday home in Northern Sweden not far from the arctic circle. Him and some locals installed a GSHP for his holiday home and they used buried pipes not boreholes. They are a lot more self sufficient up there and just get on with things themselves.

Ok for normal planning but for Class Q conversions, after 15 April 2015, the GPDO said that development must be completed within a period of three years from the approval date.

It's just lonely stick another bit of hose on Edit: blame it on zoot, I'm losing the will to live.

Yes you can think it's hold or cold or whatever but do you think everyone would think the same. The point is that without a standardised measurement nobody actually knows what the room is like. I might like the room you call clammy and not the other room. There's always a degree of humidity and you might say it feels more humid than yesterday but you could be wrong because as I said we can't sense things as well as you think humans can. A lot of things can affect how you sense humidity, such as air movement or temperature. Are you sure you can sense the difference between an RH of 50% and 60% in different conditions. You are measuring humidity using the feel of sheet of paper and I measure it with a hygrometer. Using the hygrometer is more accurate and if you're trying to ascertain differences between two rooms you would be better off using a hygrometer and thermometer.

One of the wettest around here for while.