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Crofter last won the day on May 6 2018

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About Crofter

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  1. Crofter

    What type of boarding above rafters

    That's interesting. It's common knowledge that houses in Scotland use sarking. Perhaps this is not a hard and fast rule, just common practice. It sounds like it may be possible to comply with regs if you can demonstrate that the roof is strong enough without sarking. I think the onus will be on the designer/developer to prove it, though.
  2. Crofter

    What type of boarding above rafters

    How much moisture is actually within a structure that has an impermeable polythene vapour barrier on the inside, and a breather membrane and rainscreen on the outside?
  3. Crofter

    What type of boarding above rafters

    What effect does thickness have on vapour permeability? I used OSB3, but only 9mm.
  4. I guess I am hearing the full 45dB. I bought is quite cheap as an incomplete unit on eBay- no controller. It's simply powered off the bathroom light via a 12v transformer driving the two fans inside (they are just computer PSU fans, 4w each).
  5. I've just installed a Kair single room MVHR for my bathroom. It seems to work fairly well- the incoming air is definitely warmer than ambient outside temperature- but it's pretty noisy, essentially the same as a normal bathroom extractor fan. Uses 8w, but I don't know how much air it shifts off hand.
  6. Crofter

    Use IBC (was "mbc") as a soakaway ?

    Going rate for a good, used, IBC is around £40 here. As others have said, I don't really see what they add compared to simply filling the hole with rocks.
  7. Crofter

    Timber clad suppliers and advice please

    I don't know how much you can change their offering, but you could swap that 120mm polystyrene layer for a thinner layer of polyurethane foam (probably about 80mm for the same performance, but that depends on the exact materials in question). This would allow a more efficient footprint and thus some savings on roof/foundation costs relative to floor area, and would also make fixing your cladding considerably easier. I wonder how that buildup handles moisture transfer. The insulation and render appears to present a fairly impermeable barrier on the outside of the house. I designed my own buildup to become more porous as you work your way from inside to out. But cleverer people than me can probably comment on that one. If you didn't have the layer of render, I presume you would still need something on the outside of the insulation- perhaps a breather membrane. That would certainly be far cheaper and easier than render. Then you simply apply vertical counter-battens over that, fixed through the insulation using long screws, and horizontal cladding battens over that. You might be able to fix those battens using short screws into the counter-battens, but only if the counter-battens are meaty enough. Mine were only 25mm so I used more long screws, which passed through both sets of battens and into the studs. Fitting the cladding itself is pretty straightforward- a coil nailer and some stainless nails helps. But watch out for the corners and where you meet any openings, it's quite easy to make a mistake in these places. Are you thinking of board-on-board, or some other cladding profile?
  8. Crofter

    Measuring up for replacement windows

    Yes that's a very valid point. uW rather than uG is the most important figure. I'm tending to weed out any companies that solely cite WER values, although I believe that A++ is a passable level of performance. (You'd be amazed at the number of companies who claim that 'A rated' is 'the highest possible rating'... have they never heard of A+, or A++, or are they just lying?)
  9. Crofter

    Measuring up for replacement windows

    OK so I've chickened out and have asked a local joiner to help me take the measurements. Better safe than very very sorry! Btw I've had a few quotes come in now and it appears I can get everything in 3G for about £2k (supply only). The big name window company who were visiting the other day quoted seven times that amount, for 2G of unspecified performance. OK so that was supply + install, but still! All they seemed to want to talk about was finance options- probably a sign of where they make much of their profit margin...
  10. Crofter

    Roof sarking boards. Treated, untreated.

    You can't assume that the final roof covering will remain 100% watertight- you have to plan for what happens when water gets under it. A continuous horizontal batten laid directly onto the sarking would not allow for any drainage, so the purpose of the counter-batten is simply to space the tile batten off the roof, and give a drainage gap. 25mm seems the usual size but building regs (in Scotland at least) allow for 12mm minimum, IIRC. If you really wanted to save a few pennies you could use little squares of ply or something as a spacer at each fixing point, but even someone as parsimonious as me would find that a bit stingey!
  11. Crofter

    Timber clad suppliers and advice please

    Surely you change the spec of the build and not pay for render? What's the wall buildup?
  12. I'm replacing the old timber single glazed windows in my 1970s house, and whilst I am happy enough with the idea of fitting the new ones myself, what terrifies me is that I might measure up wrongly and end up with thousands of pounds worth of windows that don't fit!! In my new build it was all very easy really because I bought the windows and then built the house around them. What's the best way to measure up- and just how accurate do I need to be? Do I take the visible internal size and add a bit. Or likewise from the external size? Or, for sake of peace of mind, should I just remove all the surrounds now and measure directly? Might not go down too well with SWMBO! Whilst on the subject, I think self-install is going to be less hassle than dealing with big name double glazing companies. I've barely started this project and I'm losing the will already!
  13. Crofter

    uPVC window suppliers- recommendations?

    Thanks, I'll give them a go although their online quote is giving some pretty hefty prices. Hope they can bring that down a bit over the phone!
  14. Crofter

    uPVC window suppliers- recommendations?

    Re-visiting this one. Just waiting to hear back from Craig, but in the mean time any suggestions at all for windows a bit closer to home? Modern uPVC have been good to deal with so far but the delivery is a bit of a killer.
  15. Crofter

    Roof sarking boards. Treated, untreated.

    The only advantage I can see in using planks rather than sheets is that they are individually easier to work with, and you can miss one out every so often to make it easier to climb up the roof whilst building. Sheets are cheaper, quicker, and give considerably better racking strength.