Boxing in gas pipes

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Can anybody tell me if the latest (2015) edition of BS6891 has changed rules about boxing in gas pipes and venting requirements? Also is it still ok to run a gas pipe in joist space under a first floor - subject of course to adequate venting? I have had two different answers to this from Gas Safe installers.

Thanks.

 

[ShaunCorbs]

Best bet would be to phone gas safe up and ask them

 

[tamz]

In regards to your question,
[video=youtube;98AJUj-qxHI]https://www.youtube.com/watch?v=98AJUj-qxHI[/video]

 

[firemant]

Also is it still ok to run a gas pipe in joist space under a first floor - subject of course to adequate venting? I have had two different answers to this from Gas Safe installers.

Thanks.

What were the 2 answers.?
Running pipes in void between floors is not required to be vented.