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If you want to attain the 0.35 u value, your construction could be like this (from garage to house) 12.5mm Firecheck plasterboard on 100 * 50 studwork with the pvc membrane sandwiched between. 75mm kingspan insulation would then go into the void to create a 25mm airgap. It doesnt matter whether...

I read a bit in the building regs today that says if the combi boiler I use has a particular type of ventilation then I wouldn't need to install a seperate fan in my new kitchen. Have I got this right and if so, is it a good idea and is it a special boiler or one that I would buy anyway? Thanks

Ive done it in 2.5mm now, thought I was going to run out and had lots of 1.5mm. Another question - I have now completed the mains wiring and want to install two runs of coax, one for aerial and one for sat. Do the cables have to be 50mm away from mains, or does that rule not apply to these? How...

I have fed the conservatory via a fused spur from the kitchen ring main. The first double socket is wired in 2.5mm as is the ring, can I wire the 2nd and final socket in 1.5mm? The 2 upstairs bedrooms (20m2 total area) are to be fed with a 2.5mm radial. Can the last socket in the run be in...

Thanks Ban. The only reason that I want to reduce the wires to the unit is that I have one incoming slot left at the back of the cu which is about 2" * 1". I have drilled through the wall 2 * 22mm holes behind this slot to insert 20mm conduit. This is the conduit through which I asked how tight...

If the appliances are fed via switched 13a outlets on a ring main to mcb in the main consumer unit, does this satisfy the regs. I couldn't find anything about the seperate fcu units in the guides I have.

but am trying to reduce the traffic at the consumer unit, hence the radial suggested for the bedrooms" I meant that I was going to come out of the cu with 1 2.5mm cable then loop it through 4 double sockets in the bedrooms rather than have a ring with two cables at the cu. Is this a no no...

Another daft question, are 25mm ko boxes fitted on the surface of my blockwork correct when I will have 12.5mm plasterboard on dabs around them. I thought so, but see so much about chasing them in. :?: My BI is insisting on them being fitted at first fix electrical inspection before the boards...

I am about to wire my new extension, and would appreciate guidance on a couple of things I am getting hung up on. I would like to do the following setup, but am unsure if the 32a ring main is enough if there is going to be the washer/dishwasher/tumble drier on it 9kw = 35A or is this not...

Thanks slippy. I can do the maths, but I didn't know if I had to protect the circuit based on what could be connected. Eg if my shower is only 7kw, do I wire for 10kw. I take it now that I wire for what I have at the moment the testing is done? I am torn between the 2 cu units in screwfix, the...

Not sure about the rating of the heater, will have a good look later but it switches through a 13a type switch and goes to an existing 30A fuse in the old cu. If less than 3kw, can I use a 16A non rcd breaker? Also, if I wire the shower through the rcd side, will the 63a rcd do or will I have to...

Hi, does this sound like a reasonable configuration for a 2 bedroom, kitchen and conservatory extension? 12 way split load cu with 63a 30ma rcd. Ring 1 - single socket in garage, 2 double sockets in each bedroom, 2 work top double sockets in kitchen and double socket in conservatory to 32a...

"DIY-ing, followed by an electrician giving you any sort of certificate (BTW, there is no such thing as a "safety certificate") does not comply with the law." Since when? You can give the LABC 48 hrs notice and £117.50. They will then send their guy at first and second fix and issue a...

The building regs just says 100mm step, it doesn't specify material. As mine is a timber stud partition in that position, it will be totally wood.

If you are referring to the gap between the base and outer wall that would be under your foot as you step out of the door, just fill it in with mortar. There should be damp proof membrane between the mortar and base. I left my membrane long enough to bring up to floor level , filled in and then...