Cavity barrier

[Lincolnshire Ian]

Hi all

Our next BC inspection is when our timber frame has been erected and the cavity barriers have been installed. 

I had assumed that the cavity barriers would be installed as the block work went up, but apparently this isn't what the BC inspector is looking for.

We have a window of opportunity between the timber frame erectors leaving and the brickie arriving to get the cavity barriers installed, but this is four weeks before the brickie arrives. 

I am assuming that the cavity barriers are waterproof, but will they be OK left for 4 weeks before being boxed in with the block work. 

Thanks everyone 

[Mr Punter]

What has been specified as cavity barriers and where are they to go?  A while ago it was acceptable just to run some 2x2 around openings.

[Lincolnshire Ian]

9 hours ago, Mr Punter said:

What has been specified as cavity barriers and where are they to go?  A while ago it was acceptable just to run some 2x2 around openings.

The 2x2 is OK around the openings, but we also need cavity barriers at roof height to mitigate the potential for the cavity to act like a chimney. 

[Mr Punter]

You can get the rockwool in plastic type which can be stapled to the sheathing.  What, if anything, has been specified?