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Thanks for trying mate, but I reckon since I have no idea how to tell whether I have joists or tresses or what type of supporting wall I have, might be best just to get someone in for a look. I'll get some quotes, see what's suggested and maybe have a go based on that if there's nothing structural.

crap, nothing's ever simple.

No worries, should have realised it was a typo. The joists are only about three inches deep, 75mm, over most of the expanse.

These timbers are roughly 3x3, slightly under if anything. Does that make them unsuitable for having more joists laid perpedicular and composite boards on top? It's just for light storage. I've walked around on what's up there without falling through, and I don't see how that point load's ever...

Could I get some clarification on the safeplates? Looks like different advice from different folks They're cheap enough but it is one more thing to track down and buy if not actually needed. The joists are not big enough to drill through the centre and still provide the required 50mm min from...

Thank you, hadn't heard of those - i've just looked them up and that looks like very good advice.

Thanks. OK, so new plan on the reroute is to still go in the centre but to put a safeplate on top for some extra protection - these are only 3 inch joists.

Thanks, I wasn't planning to notch them, but drill a hole through dead centre. I thought the whole point of maintenance free JBs was so they could be placed where they wouldn't be inspected and still meet the 17th ed requirements? But I could certainly make an inspection hatch, it's only a...

I'm planning to board out my loft space with chipboard, so I can store a load of crap up there, which means two slight alterations to the cabling up there. Since the house has had a rewire and new CU after the latest set of regs came in I have a full set of paperwork certifying it, which...