Insulated ceiling ring final nightmare.

Chris Pearson:

I can understand the satisfaction obtained from doing the work oneself and as a surgeon, jimmyhorns presumably likes fixing things with his hands.


That's the easy bit!


It occurs to me that the existing narrower ceiling does not need acoustic insulation because it must be no worse than it was previously. (R.4(3) of BR 2010). If the building control wallahs want it in the new bit, best to put it in, but the taller void will make it easier.

 

My thoughts were exactly this - the old ceiling does not need 'improvement' as it will not be any worse than it was previously and is not dangerous. I conceed to David's superior knowledge of the soundproofing issues. Due to ceiling height considerations dropping it further in the new kitchen section would not be practical - what you say does make perfect sense in terms of the difference in mechanism of actions of the differing types of insulation.


Building control's approach on this is that it is a new single room, rather than an old room and a new room. The existing rear wall of the property, (apart from 2 x 700mm piers that come out from the wall to support the 6 metre steel) disappear. On the basis that this is a new room, and this area of the room has a change of use into a kitchen, now requires different ventilation / extraction and fire detection I can live with the notion that this is 'new' rather than existing. I also note that part E only applies to new builds. 


I have already had conversations regarding the above and BC have been very reasonable about some other aspects of the build that could have ended up being very expensive to solve but common sense prevailed. I am not up for the fight on this if there is now a solution, even if this means a bit of extra work for me... life is just too short :)



Well the first bit of the electrical notes:


Supply and Main intake:


Single phase, 230V 25mm2 supply into 100 Amp cut out (Henley series 7) with TN-C-S Earth system


25mm2 meter tails from cut out to 80 Amp (non-smart) Meter


25mm2 consumer tails and 16mm2 Earth to Switch Fused unit (100Amp) and then into 100Amp Dual RCD consumer unit.


Planned circuits with diversity calcs:


Lighting 1 - 20 x 10W luminaires (All LED) = 200W = 200/230 = 0.87 Amps, applying 66% diversity =    0.56 Amps

Lighting 2 - 30 x 10W luminaires = 300W = 300/230 = 1.3 Amps, applying 66% diversity =                     0.86 Amps


Immersion Heater - 3000W = 3000/230 = 13 Amps. No diversity =                                                           13 Amps

Cooker - 4800W = 4800/230 = 21 Amps, applying diversity 10 = (0.3x11) = 10 + 3.3 =                            13.3 Amps


Ring final 1 = 32 Amps full load. No diversity applied                                                                                 32 Amps

Ring final 2 = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                        12.8 Amps

Ring final 3 = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                        12.8 Amps

Garage radial = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                    12.8 Amps


Total maximum demand applying diversity =.                                                                                             98.12 Amps





So the first issue I get to is that it is unclear whether the supply is rated for 100 Amps (though the cabling is, the meter isnt and the DNO may not specify a 100A supply)


Any flaws so far?


 

Chris Pearson:

I can understand the satisfaction obtained from doing the work oneself and as a surgeon, jimmyhorns presumably likes fixing things with his hands.


That's the easy bit!


It occurs to me that the existing narrower ceiling does not need acoustic insulation because it must be no worse than it was previously. (R.4(3) of BR 2010). If the building control wallahs want it in the new bit, best to put it in, but the taller void will make it easier.

 

My thoughts were exactly this - the old ceiling does not need 'improvement' as it will not be any worse than it was previously and is not dangerous. I conceed to David's superior knowledge of the soundproofing issues. Due to ceiling height considerations dropping it further in the new kitchen section would not be practical - what you say does make perfect sense in terms of the difference in mechanism of actions of the differing types of insulation.


Building control's approach on this is that it is a new single room, rather than an old room and a new room. The existing rear wall of the property, (apart from 2 x 700mm piers that come out from the wall to support the 6 metre steel) disappear. On the basis that this is a new room, and this area of the room has a change of use into a kitchen, now requires different ventilation / extraction and fire detection I can live with the notion that this is 'new' rather than existing. I also note that part E only applies to new builds. 


I have already had conversations regarding the above and BC have been very reasonable about some other aspects of the build that could have ended up being very expensive to solve but common sense prevailed. I am not up for the fight on this if there is now a solution, even if this means a bit of extra work for me... life is just too short :)



Well the first bit of the electrical notes:


Supply and Main intake:


Single phase, 230V 25mm2 supply into 100 Amp cut out (Henley series 7) with TN-C-S Earth system


25mm2 meter tails from cut out to 80 Amp (non-smart) Meter


25mm2 consumer tails and 16mm2 Earth to Switch Fused unit (100Amp) and then into 100Amp Dual RCD consumer unit.


Planned circuits with diversity calcs:


Lighting 1 - 20 x 10W luminaires (All LED) = 200W = 200/230 = 0.87 Amps, applying 66% diversity =    0.56 Amps

Lighting 2 - 30 x 10W luminaires = 300W = 300/230 = 1.3 Amps, applying 66% diversity =                     0.86 Amps


Immersion Heater - 3000W = 3000/230 = 13 Amps. No diversity =                                                           13 Amps

Cooker - 4800W = 4800/230 = 21 Amps, applying diversity 10 = (0.3x11) = 10 + 3.3 =                            13.3 Amps


Ring final 1 = 32 Amps full load. No diversity applied                                                                                 32 Amps

Ring final 2 = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                        12.8 Amps

Ring final 3 = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                        12.8 Amps

Garage radial = 32 Amps full load, applying 40% diversity = 32 x 0.4 =                                                    12.8 Amps


Total maximum demand applying diversity =.                                                                                             98.12 Amps





So the first issue I get to is that it is unclear whether the supply is rated for 100 Amps (though the cabling is, the meter isnt and the DNO may not specify a 100A supply)


Any flaws so far?