Wiring / Electrical / Insulation help

tek-monkey

tek-monkey

wanna see my snake?
I've realised I shall probably have a few questions over the next few weeks on these topics, so thought it best to make a single thread rather than keep using the pond one. Obviously anyone else with similar questions stick them in here.

Right, first question. I need to insulate a shed roof, the shed is about 20' by 8' and has single glazing down one side. I realise that I will never get the place particularily warm, but insulating the roof will help. I have access to rolls of 100mm or 170mm rockwool, or can buy the polystyrene sheets. I'm not sure, but I suspect the beams are only 50mm deep therefore probably discounting the rockwool.

With the poly board, there appears to be 2 types of cheap ones:

Universal 1200 x 450
Flooring 2400 x 1200

Both of these are 25mm thick, but the flooring one is 3 times the price and 6 times the surface area. Can the flooring one be used in a roof? If so, why is it called flooring? Any better ideas on what to use? Being inherently lazy I may just see which requires less cutting and get that.
 
tek-monkey

tek-monkey

wanna see my snake?
I no longer have the rockwool, but can get it again at 2 quid a roll so the possibility is there. I'll measure up tonight and see what I need. Main worry is the weight of the rockwool not being fully supportedby the hardboard, but will see.
 
Rikki

Rikki

Well-Known Forumite
Personally I would cross battern the roof with lath and plasterboard it over stuffing it with rockwool as you go. You should probably use the silver backed plasterboard aswell to help protect from condensation damage.
 
tek-monkey

tek-monkey

wanna see my snake?
Could be a plan, ta. At the min this project is def for after the pond/wiring, which has cost 300 quid so far! All needs doing though, the joys of owning a place eh! Need to do it now though, before I lose interest, lol.
 
basil

basil

don't mention the blinds
I was just thinking, you do seem to be undertaking a few projects at once........
 
tek-monkey

tek-monkey

wanna see my snake?
I am, but have a definate eye on what comes when. The pond will take a while, so needed to be done first. The wiring for the pond involved part of my plan for the shed, so the electrical side at least is nearly taken care of for that. To be honest by the time funds are available I'll probably just wait til the end of the summer, wont really need it til then. I have some time off booked, so these jobs should be done within 3 weeks.

The BBQ comes next on the agenda, which I shall probably require for my resident mooses birthday 'twards the end of May. If done sooner there could always be an informal forums meet... :D
 
tek-monkey

tek-monkey

wanna see my snake?
As my drill died today, looks like I need a new one. To be fair it was only a power devil, and I'd had it 12 years! Any thoughts on this? The B&Q link says single speed, yet mentions 2 speed later. Found better details here though and it seems OK. Doubt I need a cordless and this seems the best price/performance corded one I can find.
 
tek-monkey

tek-monkey

wanna see my snake?
OK, now I'm confused. Opened my consumer unit and have no idea where I'm putting what! This doesn't look familiar to me, although it is 15 years since I last did this....

It has 2 connections on the incoming RCCB, which I assume is one live and the other is marked as N. At the bottom of the RCCB, there is a copper bar joining all the switches together. I am assuming this carries the live to those switches as long as the main RCCB is on, but you know what they say about assumptions. Therefore I would assume I take live feeds from the top of these switches for each run I do, connecting the neutral/earths elsewhere. And there lies the problem. There are 3 copper screw blocks at the top of the unit, 1 of 8 and 2 of 4 or 5. These sit on a plastic runner, held rigid by an interior metal bar, I am not sure if they are isolated or not!

So, any thoughts? I'm off to take another look.

Image here
 
Gramaisc

Gramaisc

Forum O. G.
Right. The live supply comes into the left-hand terminal at the top of the RCCD. The neutral supply comes into the right-hand terminal at the top of the RCCD. The copper busbar along the bottom will thus be live. You take your individual live circuits out ot the top of each of the MCBs. The copper blocks are for the common earth and neutral connection. Don't mix them.

Your lives are switched by the RCCD and the relavant MCB. The neutral is switched only by the RCCD and the earth is permanent.

Be sure, though.
 
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