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Digmixfill

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  1. I like the idea of AFDD but "very reassuring when you look inside the AFDD"? There are electrolytics in the example AFDD. That's not reassuring to me. What do you think the longevity of that AFDD will be? I'd much rather see polymer capacitors in something that I wish to rely on.
  2. A plan view crudely indicating where the bows are. Black = solid 9 inch wall. Red = rough line of bows. End to end is approximately 14m. Top to bottom approximately 4.5m.
  3. The rafters terminate in the wall cavity. Nothing protrudes through to the outside.
  4. That would fix the bowed section and raise the other section accordingly. Would I just plane down the rafters that would become too high?
  5. If everything was true the rafter position would be like this Hopefully the pictures show enough detail. This is the short side. The gap between the inner leaf and the old wall plate is 240mm. This is the longer side. The gap between the inner leaf and old wall plate is 305mm. The bits of new timber aren't in the correct positions, but are relative so will hopefully be a decent visual representation that the larger gap will cause the rafters to terminate much lower in the void behind the corbelling.
  6. Cut roof. Currently with purlins and ridge board, but will probably become ridge beam with purlins removed.
  7. I have new inner leaf with cavity against an external 9 inch solid wall. When I fit the new roof the ridge will be level and the new wall plate on the inner leaf will also be level. With the rafters sitting on the new ridge to wall plate line the gutter line on the bowed wall will be quite a way off on some places - up to 100mm bow. The building has suffered roof spread in its past and some parts of the spread have been repaired. Structural engineer didn't seem too bothered by it so it is how it is. When re-roofing a building where the eaves, wall plate and ridge don't line up how does one tweak the eaves end of things? I'm making the assumption that I can't just make the wall plate cock-eyed and call it done.
  8. Just quickly checked and I can fit 150mm rafters without any issue. Because the outer shell is anything but straight the space between the current roof and the new inner leaf varies and in some places I could fit 200mm. This reminds me to post another thread about how to deal with this...
  9. To keep increasing the rafter height and lowering the ridge beam position, at some point I will need to start chopping into my new internal walls to lower the wall plate. I can carve the nose of the rafter to fit into the space behind the corbelling, between the external brickwork below and the tiles.
  10. Our rafters terminate in the cavity behind corbelling. I would think there is a limit where lowering the ridge beam height to accommodate the deeper rafters would cause the end of the rafter to kick up tiles. All of our second floor is room in roof and head height is limited in what will be a shower room. I can play with the space available to see what I can get in. Still no downsides to the idea though
  11. Building control will be checking everything, as usual. Like most on here I plan to over insulate It's already designed to be a room in roof, so no storage space to lose.
  12. Hello all, I've currently got 3.25"x2" rafters and purlins with a ridge to wall plate span of a little under 3m. I'm considering upping the rafters to 125x47mm and installing a ridge beam. I can only see advantages with the change. Then I think - If that is the case why aren't all room in roof ridge beam and not purlin? Are there disadvantages that I should consider?
  13. Thank you very much, that's perfik. 2x47x300mm span 4.65m@C16 and 4.85m@C24 at my spacing for the higher weight dead load.
  14. I'm hunting around for a span table that will give me some purlin size options for a 4.5m span with purlin spacing at 1.5m, and so far turning up empty. My plans say "existing" for the purlins. I have a mishmash of sizes currently and if I'm going to replace them all I may as well standardise them. The existing purlins for the 4.5m span above are 250x75mm these seem a bit on the svelt side. Anyone have a span table that covers 4.5m? TIA.
  15. This is our stairwell edge It's this kind of detail that has me thinking about the entire edge of the stairwell.
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