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I removed all the lathe-and-plaster from two bedrooms in my victorian flat, and insulated. Both are under a flat roof and coom ceiling. I've added the photos here: https://www.diynot.com/diy/media/albums/coom-ceiling-and-flat-roof-insulation-in-victorian-flat.26685/ still work in progess...

25mm PIR board run across underside of roof joists, then 4x1 battens fixed thought shims to the joists. Plasterboard will be attached to the battens.

There was up to 30mm difference in the lower side of the joists. I used a laser line-level to add plywood and glazing packer shims to even this out.

Roof joists are 200-300mm deep, so this left plenty of room for insulation under the whole roof. The extreme left of these joists is the ventilated pitched roof. The right side will have a small ventilation opening to the outside of the coom ceiling insulation.

2/3 of roof is flat. Front 1/3 is pitched. This is how I used long 4x1 battens to push the insulation above this space (approx 4 metres deep). There's a slip knot in the end that I pull to release once its been wriggled into place.

Added 50mm PIR board on inside of dormer window roof, with 50mm ventilation gap

The old studs were a bit flimsy, and attached to the side of the roof joists making it harder to fit the insulation. The bit in the middle is where the partition between the 2 rooms will go

Left a 50mm gap on outside of insulation board for ventilation.

This shows the coom ceiling after the lathe-and-plaster had been removed. The roof tiles are on the other side of the horizontal boards. No membrane, and big gaps between the boards. Above the actual ceiling section is an asphalt/bitumen flat roof.

I'm looking for recommendations for a wired doorbell kit (chime, transformer etc) that will work over a distance of 20 or 25m. Thats the distance from CU on 1st floor to the front door on ground floor (its a house converted to 2 flats). Chime will be a few meters away from CU. Thanks Ian

I was thinking of using acoustic plasterboard to board a wall that has a coom ceiling and Victorian dormer window, and noticed it’s only available with a taper edge. Why is this? How do you deal with outside corners when using taper edged board? Does two tapered boards meeting at an...

Looking for some thoughts and advice on a mess of old wires and stuff (need to find out names as well!) Its an old Edinburgh Victorian town house thats been split into two flats in the 1950's. I own the upper flat. The photo 1 shown below shows the wiring in the shared entrance hall...

Its an old Edinburgh Victorian town house thats been split into 2 flats in the 1950's. The supply from the street comes in the bottom left. The GF flat is fed by the thicker red and black cables, that go into copper conduit, down the the bottom left of the photo.

My flat (upper floor) is fed by the smaller red-black wires, that feed into the white meter. This was installed circa 2009 I think.