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Restoration of a 150 year old Barn.
clockmanFRA:
Hi MattM,
When finished this Barn/Lecture Theatre will be to Passive House standard.
With old buildings I build a new building inside, therefore minimal loading on the original building. So my new thermal block walls will support a new internal roof frame. This frame is lightweight as it supports itself and the plaster ceiling.
Here is the Old Medieval, (mostly 1700's), Long Barn, inside upstairs.
The thermal block walls support the first floor/upstairs and continue up to finally support the new roof/ceiling frame. I allow a space between the new frame and the old building for about 450mm, 18 inches of Insulation, the glass fibre stuff which is made here from re-constituted glass.
And that barn upstairs room bit finished...........
MattM:
The advantage to insulation under a radiant barrier is keeping the heat delta off direct contact materials. Your slate gives you a hotside off the insulation, but your airgap isn't stopping radiation with felt underlayment. You also have two airgaps, the second being the rolls of fiberglass. When hot meets cold you get condensation. Your two airgaps will hopefully not have too much difference or the fiberglass is getting soaked over time, and with the moisture barrier paper underneath, there is where it's going to collect.
Look into cathedral ceiling insulation standards before you get too far. I don't want to sound negative, it's just one of those situations you want to avoid with all the readily available data out there now.
clockmanFRA:
Its always difficult with Old buildings getting the moisture traps/leaks sorted and it takes a fair bit of time getting it right and can be extremely fiddly.
Thanks for the 'Cathedral ceiling Insulations'.
Okay my normal plan............Slate, 50mm Air gap exterior venting, (here we use 1 inch thick lath on 1 inch thick up lath), Breathable membrane, wood close boarding with 15mm air gap cross flow, then 75mm to 100mm air gap the up joists, a Insulation/vapour barrier (but not defined yet as depends on the local conditions and venting possibilities), 50mm air gap to my new frame work insulation, then 200mm fiberglass insulation roll, 200mm fiberglass roll diagonal to first, 75mm to 100mm fiberglass batts cut for correct fitting into new ceiling frame, 14mm plasterboard with finish. No down lighters, ceiling is sealed.
My supporting walls will be over 600mm/ 24 inches thick, so good space for sorting out the eves insulation properly.
Insulate, Insulate, Insulate and more Insulation, I love the stuff.
clockmanFRA:
And the slates start to go on....... just 2,300 off, and 4,600 copper clout nails........
Drill jig set up for 6 slates at a time with the holes spot on.
The table disc cutter very quickly cuts the slate to exact size for the angled roof ends etc.
sean_ork:
Foil backed plasterboard ?
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