20/05/2022
COMPRESSING AND ROTTING TIMBER IN COB WALL.
Customers sometimes ask what will the condition of the cob be like underneath the existing artificial sand and cement render. Unfortunately, you never know as it is very much like working with is a can of worms because you never know what you're going to find.
What you typically come across mainly is woodworm infested timbers which there are 11 different species living in the UK. Wood boring beetles and sometimes rats are also prone to living in the structures due to wildlife taking advantage of damp environments that have been made from the usage of non-breathable materials.
In the last 50 years this has results in sometimes structural collapses which is very common in cob.
In the pictures, there is an area that I exposed on a cob garden wall with a stone plinth and a small piece of hardwood added to the structure at some point. The state of the timber was so bad it has completely turned into powder, which is shown in my hand. It is by far the worst I've seen so far, this was due to the fact the area was encased in a sand and cement render and also coated in bitumen which you see everywhere these days.
Somehow, it has become a tradition to paint a 2 foot high black strip from ground level around your cottage. This originated from recommendations from damp proofers in the 1960s who recommended bitumen which is highly detrimental to historic buildings. However, because of this, it has now become fashionable to paint the bottom area black or with bitumen which doesn't have anything to do with the heritage of the building or neither is it traditional.
People need to bare this in mind on larger scales, especially when it come to structural timbers as it can become very costly especially, if it is inside your home.
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