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I did some checks on Building Control Approved Document C. It states that "where a cavity is to be partially-filled, the residual cavity should not be less than 50mm wide". This appears to be a guidelines than rule...

As per Building Control Approved Document C, for a part-filled cavity, "where a cavity is partially filled, the residul cavity should not be less than 50mm wide" Section 5.13. It appears that the reasoning behind is there should not be any contact between outer leaf and insulation to prevent a...

This is a very good point Endecotp. Thanks. Sticking the insulation to the inner leaf should avoid the insulation becoming a bridge and prevent the inner wall becoming wet.

I agree, adhesive may not always work. By BC agrees to, I would be happy to use vermiculite as alternative. Is external insulation an option? Would this avoid cold bridging risks and serve the purpose?

Thanks JJ. For the sections are still visible, we will exactly as you suggest. I bought PU adhesive. Does vemiculite provide a firmer fit? If there are blocks that are not accessible, are there other solutions?

The building control officer informed us it needs fixed but would not comment on how or why. I am now left to figure out a solution. If I don't fully understand why I should fix the issue, the solution options available is a wide range. The forum could help with understanding the risks of not...

Yes, a good job will require the work you suggested. It will cost time and money. Your question on "is it really going to matter" is a good one. I don't have an answer and keen to understand.

I am using PIR board insulations. My builder is a friend and hence liabilities are not too well defined.

We are currently building an extension work involving cavity walls. The builder seem to have done a poor job - the insulations are loose and have not been stuck to the inner leaf. The building control officer is now requesting that this is fixed. I am wondering how to fix it as the construction...