With the roof works almost finished, we’re thinking about insulation. I recently discovered that the spare room/lounge part of the house, which sticks out from the main part of the house, was not insulated at all. This explains why the spare room is noticeably colder than the rest of the house. It’s also the first bit of the roof that’s finished properly, so that’s where we’ll start with the insulation.

I read up on insulating an old house using a Historic England document called Energy Efficiency and Historic Buildings: Insulating pitched roofs at ceiling level-cold roofs. A snappy title for a very interesting read if insulation is your new obsession. It was clear that we needed a breathable insulation that wasn’t the existing pink fluff. Enter sheep’s wool.

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There are a few places that make sheep’s wool insulation and we went for CosyWool by Thermafleece, made in Cumbria. We got three pallet loads of it to insulate to 300mm depth, which is the biggest, thickest blanket I will have ever seen.

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To insulate the sloping ceilings at the front and back of the house (where the slope of the roof cuts into the upstairs rooms) we have some wood fibre sheets to apply from the inside. They are 60mm deep, which will give some benefit and still be relatively easy to handle.

The Historic England document has lots of excellent diagrams showing how we’re going to install the insulation.

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