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big-all, you said screws don't count, just had another look in loft, and as you can see from the photos only the threaded part of the screw is into the timber, no shank, and about half to three quarters depth into the wood. So, even though a pilot hole was drilled, which would be small, it...

If I fit plywood strips each side of the 70mm deep x 35mm wide roof trusses and bond with PVA glue, three questions:- What thickness of ply would be best? Should I fit one piece each side or short bits spanning just the 4 screw locations? What type, size and length screws?

Yes the felt is slightly damaged in one or two places, have examined the whole roof during a long heavy rain downpour and no sign of any water ingress... Yes it is a bit of a mess, but I guess it is difficult to measure accurately from the outside where the holes will appear, most are into...

Yes, I wondered about using plywood, would you just use two short pieces either side of each screw location rather than two long lengths? BTW I didn't do the repair, the installer did..... Thought about making a fuss to get them back to do the repair work, but after seeing what they have...

I guess the shank is 10mm, here is a photo of one screw that partly misssed timber and also photos of one that split the wood and was braced with new timber [/img] [/url] [/img]

We are talking screws and yes they are huge, they very long and are fitted by pre-drilling through tiles and into timber. I guess they are that size because they are very long, the installer admitted that they should have been M8 screws, but M10's were fitted by mistake, but insisted it was...

I am not sure really, just that I now have 4 x 10mm holes in each of 12 lengths of wood that is only 35mm wide and I understood the building regs say any holes must be at least 4 times wider than the width, ie wood should be 40mm wide for 10mm holes. I can only assume they must state that for...

I have just had solar panels fitted to my roof, they are fitted using screws through tiles into roof trusses or joists. However it would appear they used too large screws, 4 x M10 in each timber which are only 35mm wide. I think this does not comply to the building regs as they should have...

Thanks Taylortwocities, was rather hoping it was just bung in a RCBO and all would be okay, had a look at the regs and think it would all be okay but now I think I might just keep the bonding to the rad pipes below floorboard level and leave all as it is....

Thanks for that sparkwright, so if I change the MCB on the circuit feeding the bathroom lights to an RCBO it will give me overload and over current protection. So then I should be able to not bother connecting the bonding on the new radiators in bathroom?

I was looking for an RCCB, what are RCBO's, do they replace MCB's?

Maybe I am getting confused, they must be MCB's then...