External insulation for old building, built in 1908

2019-04-15 18:30:40

Between 1880 and 1915, extremely solid houses were built. Money was plentiful, the French paid immensely high repair costs

Uh, in 1908 that would not have been WWI yet, and 70/71 was already a few days past. Solid yes, but not lavish. Here, the pumice was clad with facing bricks on the street side, in the Vulkaneifel they indulged in basalt all around.

When they replaced the windows and looked at the masonry, they saw a double-shell wall made of 24 cm bricks, a 13 cm air layer, and 11.5 cm facing masonry

More like 25 and 12 cm, back then still the old Reich format.

60 cm is only rarely without an air layer.

I see it the same way.

2019-04-18 14:53:16

With a wall thickness of 60 cm, I wouldn’t consider adding another 10-16 cm, unless you like the bunker look.

What kind of building is it? A "villa" or an old church building, an old craftsman’s house?

Neighbors on our street have acquired a "villa" from that period. The wall thickness is about 50 cm. When they replaced the windows and looked at the masonry, they saw a cavity wall made of 24 cm bricks, a 13 cm air gap, and an 11.5 cm facing brick (plastered). They cheaply added blown-in insulation to the air gap, the windows are triple glazed, and the roof is properly insulated. They have energy needs like a new building.

Many buildings around the turn of the century have cavity walls (partly plastered) – you should check this in your house too; 60 cm is rarely without an air gap.

Sorry, I was away on business for a few days, so this is my answer today. This is a "normal" house, not a villa or church building, as far as I could find out, the house of a small business owner. It is not a cavity wall.

So if I understand correctly, the consensus is rather to forgo external insulation – because I didn’t actually want to have a bunker.

Thanks for the suggestions.

External insulation for old building, built in 1908

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