I've just built a little dwarf wall in the eaves of my dormer bungalow (we're only talking about a 4 foot right-angled triangle), to close off a space behind a room. After three days the mortar doesn't look like it's gone off properly, but is sandy and crumbly. Central heating pipes run through this space and under the wall, and I'm thinking that the warm, dry air has caused the mortar to dry out too quickly and prevented it going off properly. I'm now considering removing the wall and rebuilding it. I'd turn the heating off during and afterwards, and possibly give the occasional mist of water to keep things wet for a bit.
My question is: how long ought I to plan to leave the heating off, to be certain I've given the mortar a chance to go off? A day? Two days? Longer? I know I can wait and see, but in the interests of domestic harmony I need to plan this against the weather forecast ;-)
Regards Richard