cavities closed at apex.....insulate or not?

[jonCar]

Hi all,
we live in a 1927 semi and are thinking of having CWI.
Would this be a good idea since the cavity is closed with a row of bricks at the apex of the roof-line?

 

[^woody^]

Not really

 

[jonCar]

Thanks, was thinking this but can you explain a bit why not

 

[^woody^]

No sorry, I misunderstood the question - I thought you asked whether to close the cavity or not.

Yes, it is worth insualting the cavity as this will be a better insulator than air.

 

[jonCar]

ok thanks.
just a neighbour said he wasn't having CWI because of the cavity being closed