Pad block for Lintel.

not sure what you are trying to acheive here but...it's better to have the padstone sitting squarely on the masonry - any overhang, in this case 33% of the padstone, can destabilise the whole thing.

Why is the lintel only going on the inside skin? - what's holding up the exterior masonry?

Why not use a 3ft 4X3 pre-stressed concrete lintel cut in half, so that you have a 18 inch long, 3 inch tick and four inch wide padstone at each end?

having a 50mm ovberhang is going to cause problems, not least for the plasterer!!

It also means cables can not be routed over it - assuming it is in the

Without the 150mm Ceiling Zone you have to drop cables down the Corner

Something to bear in mind re impact on other services... :-)

If I make the pad stone say 6" thick and it tapers from the 6" length down to 4", would that be a goer?

The wall is double brick (old terraced house) but a stone lintel which is about 8" high overlaps the the point where the back wall and wall to be removed, join. If I wanted to install the wall opening lintel above the stone lintel the job would become too messy.

It's a price worth paying to achieve a flat wall finish.

Thanks.

Arthur