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If I counter-battened wouldn't the verges show the thicker mortar? There would be an extra cost too. Please tell me about the options though.

I intend having all the slates re-layed on the roof of my 99 year-old house, in order to repair several leaks. There is an attic room in most of the main roof, with sloped ceilings along both sides. The rafters here are 3.5" deep, so there is only this space above the original lime ceiling...

woody. "It would probably be better to do dutch bond on the piers with 3/4's at the end instead of header/close". Please expand for one non-brickie.

Thanks, masona. But there is nothing specific on this link about pier bonding courses. I need details showing the correct bonding of a 13inch square pier into a 9inch wall. The pier can be centred, or projecting all on one side. Also for a pier that forms a return in the wall too.

Thanks woody. It sounds possible then, but (not being a brickie) please could you assist me with a visual pattern of the bricks making up the two typical bonding courses, particularly for the return pier.

Retainer wall: I am planning to have a low 5 course 9-inch wall (can be either Flemish or Flemish Garden Wall bond) built to enclose two sides of a small patio, using old imperial-size local bricks. I wish to have three Flemish-bond attached piers, 3 courses higher; one at the square return and...

I am about to re-make a hearth to take a stove. I have dug out down to soil level and blinded over with sand, and my next step is to put in insulation onto a tanked DPC liner, in order to lay a concrete base up to screed level. What are the current regs. re insulation in this situ, please. I...

Convincing argument, ban. Thanks.

shaggy quotes: 'be enclosed in earthed conduit, trunking or ducting ..., or be mechanically protected sufficient to prevent penetration of the cable by nails' With respects ban, the regs. say, 'or'; not, 'and'. Don't they?

I would like to know if it is acceptable or not to use galvanised capping in this 'blind' situation, if the capping is bonded to common earthing. Also is it also complying with the regulations to enclose cable within two sections of capping, with the first (back) piece fixed the 'wrong' way out...

plugwash said: 'note that you only have to satisfy one of those two, not both (notice the or)' 1. So, what if the galvanised capping is properly earthed/bonded? Even though it may not be nail/etc-proof. 2. Could one get away with fitting say just an actual functioning light switch, in a...

plugwash: Yes, A is non-NTE5 master (not ordinary socket, but the BT linesman must have swapped it, honest!) Many thanks indeed for the economical description for wiring in the extension.

raychem, plugwash: my humble apologies; I think I must have the non-NTE5 master sockets I didn't take off the fronts; presumptious error. (Thanks plugwash). plugwash asked: 'at least one of Bi and Bii must be a master (open them up and check)' Yes. One does have the non-NTE5 (according to...

andrew2022 said: 'a ring uses 2 2.5mm cables, givin a total CSA of 5MM. the two 2.5mm cables combined have a rating of 54A' (The Electrician's Guide' Table 4.7, page 63) Can I assume these figures apply in principle for both ring circuits and for radial circuits, but that a ring can be rated...

Thanks, yes I always make a layout sketch before undoing anything and keep them all! There are two different telephone numbers. The drop has 4 conducting cores; plain colours of black, green, orange and white. These go to a 4-way terminal block (BT52A). Here the 4-core meets a 6-core (internal...

plugwash: thanks for the useful images, so master sockets are physically different. (If you are not supposed to connect to the back of non-NTE5 master, why are there connectors?) raychem: I do not have a master socket because the drop comes in to the roof. Junction boxes are used already to...

Thanks, raychem, Lectrician, plugwash. I don't think I've got a single master socket as such. I just have these two terminal blocks, fitted over twenty years ago. So would the first phone socket technically be the master, or is the master different physically than other sockets? I wondered...

My BT drop line terminates inside my roof space to a block terminal (BT52A). this a 4-core junction box with screws. Phone cable then extends from here to another 6-way (BT35A) junction box in a more suitable place for distribution. Does anyone know if I can extend to new jack by using the...

breezer, JC GRAY: I thought T&E was referred to as 2-core. The Electrician's Guide, page 63, Table 4.7 gives 2.5mm sq cable as 2-core. I meant is 1.5mm sq T&E cable suitable for an outside PIR type floodlight with/without a combined darkness switch and with/without a movement sensor. They seem...

Is 1.5mm sq T&E adequate, as 2-core, for a security light with built-in sensor (circuit protected with RCD in CU)? Will 2-core be adequate if I want a separate sensor too? Thanks.