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    Thehmostatic radiator valves keep failing

    That's the bottom of the head fallen to bits isn't it? (Rather than the valve body). Agreed a year isn't really acceptable, 7 years is only tolerable. I've been using Toolstation 'contractor' valves with Drayton Wiser heads- been in 8 years now, no problems. The TS heads look quite robust, you...
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    Cutting up (and getting rid of) a cold water storage tank in the loft.

    Angle grinder with a diamond disc (tile or brick cutting) works well on plastic- bit noisy but no chips cos the cut gets warm. Enjoy :)
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    Smart TRVs

    You can group multiple Wiser TRVs into one 'room' if you want to (I have 2 rads in the sitting room set this way). Or as mentioned keep the TRVs in separate 'rooms' and just use a common schedule on them.
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    Prepping bathroom walls for tiling

    Have a think about insulation (if any of the walls are outside walls). You can tile direct to brick or block. If you are boarding out you'd ideally use cement or marmox or something not plasterboard for the 'wet' walls (shower end and side of the bath)
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    Planning pipe runs for new combi boiler

    Some general notes rather than specifics; When you replace the rads you will need to do your heat loss calculations- make sure you use modern tables (using lower flow temperatures) so that your boiler can condense properly. Once you have your heatloss calcs you can then determine tube sizes...
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    Terraced house, water pouring down both apex walls

    All that greenery poking out by the cover flashing may not be helping- if there is soil buildup under the slates the soakers could overflow. Green tinge to the chimney says there's lots of water coming down there as well- possibly getting under the felt/whatever is covering the coping stones and...
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    Terraced house, water pouring down both apex walls

    It may be an optical illusion but in your 2nd pic the top edge of the lower cover flashing seems to be poking out underneath the higher cover flashing.
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    Insulated plasterboard - walls not level.

    Batten with shims/wedges will work fine and gives you a useful 'hard' line to level to. Drywall adhesive (the stuff used for dot and dab) will also work at that thickness but it gets expensive...
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    Stud Wall + Insulation On Outbuilding

    For soundproofing you'll be better off with acoustic batts rather than Celotex. Thermally the acoustic stuff is less efficient than PIR BUT it is much easier to get soft batts airtight. Overboard the studwork with at least 25mm PIR, maybe 50 (do the heatloss sums, i CBA) then plasterboard. (PIR...
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    Switch to a combi boiler

    First thing- your post is in the wrong forum, really needs to be in Plumbing and Heating. Second, has anyone checked dynamic supply pressure (ie with cold tap wide open, what pressure is pushing water out). Third, there's not a lot of point fitting boost pumps to the input of a combi. Fourth...
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    Leaking GRP flat roof

    GRP rooves can work well but preparation is critical. It can be patched but pics would be useful. Blisters in the laminate aren't a good sign of quality workmanship....
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    Do i need to rewire or upgrade consumer unit for EICR??

    If you can interpret the results appropriately to identify any faults and rectify them then yes it is. A CU swap on a 'good' installation will be a fixed price. Fault finding can take hours and add substantially to the bill. An added note- if any rooms are short of sockets think about adding...
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    Do i need to rewire or upgrade consumer unit for EICR??

    What you can do is look at all the socket outlets, light switches, pattresses etc and replace any that are cracked or broken (i'll guarantee there'll be a few). If you want to do your own loop tests etc then crack on- the value in that will be if you discover and rectify a fault it'll be a lot...
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    off timer for smart lighting, advice please

    The Sonoff stuff comes with a handy app (Ewelink) which lets you put event timers on anything- the event can be anything it knows about including switching it on. A timer setup on a staircase could be a bit risky - there you are trotting down the stairs when the light goes out, you trip over the...
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    Recent job

    Remember these plugs don't have fuses in them so the whole circuit has to be rated to whatever MCB is in the distro. Loads easier to have every cable the same gauge so it doesn't matter which one you grab.
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    Cable size for extension?

    1.5 protected by a 13A fuse is fine. The better solution is to run the kettle (2kw ish) from the fixed socket and either the nuke (900w) or air fryer (500w) from the trailing lead.
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    Permitted development

    You also might want to check the planning permission for the build- as well as any stipulations on the deeds you may find that PD rights were removed as a precondition of that pp. Easy enough to do online.....
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    Is this reasonable damage?

    The odd hairline crack in plaster above an inserted beam wouldn't be unusual. A 15mm gap and doorframes distorted is not acceptable. If the steels were RSJs (rather than preformed lintels), Building Control tend to require drawings and specifications from a structural engineer- if your builder...
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    Running a dehumidifier off of a 12V battery (thinking of)

    I use the cheap non-reusable silica things in the caravan over winter - keeps the thing reasonably dry so the cushions don't get stinky and start rotting. For drying out a flooded house you're looking at days not hours. Cheap domestic gennies aren't rated for 100% duty- in that world you are...
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    Running a dehumidifier off of a 12V battery (thinking of)

    Short answer - unlikely to work and even if it did, site dampness is mostly a problem when the building is not airtight. Even if it did work (with your bigger inverter) you'll get at most 3 hrs runtime from your 110aH (at 12v) battery. Most dehumidifiers work by cooling the input air so water...
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