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Blob the Builder

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Everything posted by Blob the Builder

  1. Blob the Builder
    I've tried to find a thread on the forum about spray pu insulation without success. Does anyone have experience of it regarding cost and insulation values compared to PIR? I'm planning to insert 140 mm PIR into my open panel timber frame walls. But i have so many studs at varying centres that i'm considering alternatives.
  2. Blob the Builder
    My BarriAir has arrived, and i'm a little surprised as it is fabric material akin to external membrane. I was expecting polythene. So, do you think it is suitable as a vapour control layer?
  3. Blob the Builder
    Ahh, most of my panels now constructed. So much to research, i've not even discovered certain products yet...
  4. Blob the Builder
    Ok, i'll check that stuff out....
  5. Blob the Builder
    Good tip about the integral taped seams; that sounded a good reason to buy the stuff in the first place. Siga Sicrall tape sounds good; but whether its necessary to use a double sided as well? I'm not going for any passiv standard, just practical sense as i have a single leaf wall with timber cladding.
  6. Blob the Builder
    Hi, I'm purchasing my vapour control layer and wondering about tips for use of, and type used. I'm considering BarriAir, which says comes with integrated sealing laps. But is only 1.5m wide, is that a practical width? Although i'm only at panel erection stage, beautiful day for it today, i'm thinking about when i place my mid floor joists atop of the ground floor panels, and the need to have the VCL in place to be underneath the joists. As the VCL layer will go around the ends of the joists and be taped above and below. Does this make sense?
  7. Blob the Builder
    On site constructed panels will sit on the sole plate.....been working on levelling it today, and we're getting there.
  8. Blob the Builder
    good points...
  9. Blob the Builder
    Mmmm, that was my intention, but......
  10. Blob the Builder
    Way to go, thanks
  11. Blob the Builder
    A combination of both i think...4.8 m length of timber with some twist, and mainly, a lack of attention by the brickie, who of course blames the timber!
  12. Blob the Builder
    ok ta
  13. Blob the Builder
    Line is good. We drop 10 mm across the 145mm timber, so packing between timber and mortar the likely solution. With plastic packers, then mortar or sealant in the gaps?
  14. Blob the Builder
    About 10 mm across the 145 mm width of timber, the 10 mm being at the outside edge.
  15. Blob the Builder
    Another day, another topic....Today we're fixing our timber soleplate to our concrete block wall. We already ascertained last week that the blockwork wall was not level enough at various points. After reading stuff about packing underneath the soleplate regarding potential condensation problems, and difficulty in filling under the packed plate to achieve air tightness, i decided to get the brickie back to bed the soleplate in mortar. It's done and is level enough running around the perimeter, 18 m x 6.5 m. But it's off level running across the 145 mm of soleplate for a length of about 10m running down one long side. I'm a little upset by this, as not only is my internal FFL affected, but we're still looking at having to pack the sole plate !.......any ideas community?
  16. Blob the Builder
    That's interesting AliG, similar proportions to myself. Looking at thermal resistance, it looks like 230mm of frametherm 32 between rafters, and 50mm PIR on warm side of VCL would give same resistance as 190 mm PIR between rafters and 25mm PIR internally. But i may sitck to PIR betwixt the rafters (was just trying to cut down on cutting PIR) And, i'll also run 400 mm frametherm across the flat ceiling , covering my MVHR ducting.
  17. Blob the Builder
    I'll take a look at your blog. I have a triangle of cold space below the ridge also, 1600mm height x 3444mm wide, where i plan to have my mvhr ducting running, covered in plenty of fibre insulation.
  18. Blob the Builder
    Yes i read the Tyvek technical sheet that says that.....is that because the irregularity in slates allow air to get underneath them? and because sarking boards, being a couple of mm apart, allow air through to the top of the insulation?
  19. Blob the Builder
    Hi Christine, soothing to know you still encounter problems on your 3rd build...
  20. Blob the Builder
    Not exacty Architect designed, more self designed from inspiration of others. We're building the kit onsite ourselves. Has been through a structural engineer and usual building control route though. Steep learning curve.......and with the forum as well!
  21. Blob the Builder
    My roof pitch is 37.5 degrees
  22. Blob the Builder
    I'm trying to decide on my roof make up. If i go with tradition and have sarking boards on my rafters, covered with a membrane and slates nailed directly through, then what ventilation should i provide? My rafters are 245mm depth (i have 1 and 1/2 storey room in roof) so i have scope with insulation. My original specification involved fibre cement slates, battens and counterbattens, ventilated above membrane, on OSB. Below OSB a 50mm vent gap, then 190 mm of PIR between rafters, 25 mm PIR internally across rafters, then plasterboard. But now i'm thinking of natural slate. Do i need ventilation gap beneath sarking boards? I've read some details which say i can full fill between rafters, which could open the way for Frametherm roll or equivalent, and internal PIR across rafters, possibly 50mm. And do i need ventilation above fascia and in ridge?
  23. Blob the Builder
    Hi, I'm doing a one and half storey self build in rural South Lanarkshire. Its longhouse style 18 x 6 m gable to gable. We're up to DPC, having laid strip founds; single skin blockwork wall to DPC; ground bearing slab make up of type 1 base with drainage laid, blinding, DPM, 300 mm EPS (75mm perimeter EPS),VCL, 150mm self levelling concrete slab containing wet UFH layout.
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