Cavity closer with/out DPC

[unclebobby]

I have recently built a cavity wall as part of a shed/office wall (no building regs). It has 4" dense block outer and 4" aircrete block inner and I closed the top of the cavity at the eaves with blocks on their sides. They rest on the outer leaf and butt the side of the inner leaf.
I forgot to put the DPC in initially and therefore theoretically have a path for moisture to cross. The wall will however be rendered and painted and this section of the wall will have a fascia to protect it.
I reckon it should be ok as is, after all old 9" solid brick walls aren't perpetually damp on the inside - or am I missing something.
I could cut a slot in the capping blocks then fill it with silicon, but not sure there's much point.
Anybody got any comments or advice ?

 

[freddiemercurystwin]

At the top of the wall you're probably be OK (above the eaves?) More of a concern will be the massive cold bridge. Its possible you'll get a bit of mold in this location at some point.

 

[unclebobby]

thanks FMT. yes it is at eaves level.
i did think about the cold bridge but the closing blocks are aircrete and butt against aircrete blocks so not tooo bad. i might even dry line the walls for a bit off added thermal efficiency - or perhaps that will be for the future.