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I have an old book that says the rule of thumb for arriving at the extra dimensions required in the trimming joist [the two joists supporting the trimmer] is to add 1/8 inch in breadth to the size of the common joist for every trimmed joist supported by the trimmer. So you should use 195 x 90...

I can't visualise how you intend the new layout to be. If you really mean to extend the layout so you end up with a single, longer, loop it should work without problems. If you will end up with 2 parallel loops one will probably be longer than the other and water might mainly or only circulate...

I have no clue about electrics so this is a very uninformed comment, but we had problems with the supply to our house. An electrician who came to investigate pointed out that the incoming cable, and the main fuses, were very hot. (This was not the problem he came to investigate but another...

Why do you need a Tee behind the washing machine? Can't you use an elbow so there is no open end to terminate?

Why 12? It is important how many hours per day the air temperature is above ground temperature, which is almost always well below 12, at least it is here. You make a good point though. I'll try and find some more detailed temperature figures and do some more calculations.

I imagine so. A 12degC source must be very good, but there is no way we could get that. Our property borders a large lake but in winter we can drive on it, and even in summer it isn't over 12degC for very long. Our heat source is a loop of pipe buried in the ground.

That is an interesting observation. Maybe what it is saying is that the installation costs are relatively high so to get a good system you need to be able to afford a hefty up-front payment. Skimp on installation and you get a system that doesn't perform too well. We took a middle route to cut...

ASHP and GSHP are, to a layman like me, basically the same technology with just the source of the heat being different. Is that a reasonable view? If it is, then one key factor affecting the COP is the temperature of the heat source. In real winter the ground is warmer than the air, so I would...

No, that can't be it. The angled guide fixes on a rod at the side of the table and is clamped firmly in place so it cannot slide. I though I must be missing something that should have been obvious but maybe this is not so simple as I thought it should be.

It is no use for anything as far as I can see. How can I use it for cutting mitre on the ends of work pieces?

Our house has mainly radiators. Currently only the bathroom has under floor heating, but I am planning to add more of it. There is no seperate boiler for the under floor heating; we just removed a radiator and connected to pipes running under the floor. It could be a good idea to have the under...

Sorry, which are you talking about now? The jig linked to above slides with the workpiece. I understand that, no problem. What I am puzzled over is how to use the guide I have as a standard part of my saw table. Perhaps I have not explained that very well. Lets say the saw blade is oriented...

Yes, I can certainly see that fixing one piece of wood at an angle to another would work OK. Thanks for that. Not sure about the mitre guide idea though. How would it work? If I put the guide at 45 degrees to the saw blade, I can't run my work along the guide to cut it, so how would I use the...

That jig looks fine for short lengths and it would be easy enough to knock up something like that. Longer cuts are still a puzzle. Also still a puzzle is what the angled guide is for on my table saw. I can fix a guide at an angle to the blade but can't figure out any way to use it. I don't...

I have a table saw that I use a lot, but I am puzzled how to do non-parallel cuts. It is possible to fix a guide at an angle to the blade, but then of course I can't just slide the wood along the guide because it would need pass across the blade at an angle. For example, how can I cut a...

Had a similar problem fitting our shower. Went back to the store where we bought it and they sourced a replacement. Interesting that the replacement was in metal, not plastic like the original, so I assume we weren't the only ones to have this problem.