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    Two way switched light in the ceiling

    Really appreciate the replies. I had all the ceiling roses in the house replaced 30 years ago - about 25 of them - and it looks like the guy who did it was not rigourous in matching the pendant cable colours to the feed's. I think the dodgy looking brown may be due to today's work, which...
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    Adding to a lighting circuit

    What was behind my question was the incorrect belief that lighting circuits were like ring mains and might be subject to restriction on the number of spurs. Thankfully that is not the case. Control is on my agenda - the LED panels come with a dimming, colour temperature changing remote...
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    Flow rates /pressure loss reduction

    I had the internal pipework and hoses improved. Flow rate went from 18 to 20lpm. Currently getting the externals upgraded to 25mm MDPE.
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    Flow rates /pressure loss reduction

    This is one for serious techies I think: I have a 12m run in 15mm pipe from the water main stopcock in the pavement to the stopcock in my house. Water runs at a maximum at 18 litres per minute along this pipe, into the house plumbing with lots of outlets open. The pressure is around 3bar at...
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    Is this correct for cooking appliances? What are the principles behind diversity calculations

    Thank you. That's feasible - just have to take the oven out to get access and navigate the cable safely behind a built in dishwasher.
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    Flat roof, no access to roof, trimming a joist

    I've made a pig"s ear of my question... The joists are 8 inches by 2 inches in cross-section with a span just over 12 feet. The roof is, from the joists upward, woodwool board, concrete screed, insulation, OSB, GRP . Built in 1963, upgraded recently.
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    Flat roof, no access to roof, trimming a joist

    Not if I have to take down 24m2 of ceiling to get access to the joists.... But, yes, we need an access hatch
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    Flat roof, no access to roof, trimming a joist

    Like the suggestions though..
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    Flat roof, no access to roof, trimming a joist

    Sorry everyone, I missed a key bit of info. It's a flat roof, no roof space other than between joists
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    Flat roof, no access to roof, trimming a joist

    Hello. I wonder if you could help with a question to see if I need to invest in a Structural Engineer and progress with a small project Situation: three storey house no access hatch joists at 16 inch centres Joist span c. 3720mm/12' 2" Want to create structural opening c 860mmx860mm, requiring...
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