About a year ago I installed new sash boxes and attempted to fill the
resultant gaps between the box and the brickwork with ordinary mortar
mix. This has not stood the test of time and has cracked between the
brickwork and the mortar with some of the mortar having completely
fallen out. Is there some trick with PVA that should be used to make
sure that the mnortar stays in place?

TIA,
Maris

On Sep 18, 4:41 pm, Maris wrote:
About a year ago I installed new sash boxes and attempted to fill the
resultant gaps between the box and the brickwork with ordinary mortar
mix. This has not stood the test of time and has cracked between the
brickwork and the mortar with some of the mortar having completely
fallen out. Is there some trick with PVA that should be used to make
sure that the mnortar stays in place?

TIA,
Maris

Trowelling mastic is the stuff we use - available from builders'
merchants round here. Stays slightly flexible and sticky, and can be
overpainted.

A

"Maris" wrote in message
...
About a year ago I installed new sash boxes and attempted to fill the
resultant gaps between the box and the brickwork with ordinary mortar
mix. This has not stood the test of time and has cracked between the
brickwork and the mortar with some of the mortar having completely
fallen out. Is there some trick with PVA that should be used to make
sure that the mnortar stays in place?

TIA,
Maris


I've used polystyrene. Office bought a large printer that came with a lot
of
blocks of the stuff and I cut into small blocks and fixed it in place with
gap filler.
Cheap and recycling.

Arthur