You are reading a single comment by @yeahdext and its replies.
Click here to read the full conversation.
-
Ta, noted.
Building Surveyor has been round, no concerns. Foundations are 1.5m deep and no signs of movement of property. Fortunately its located next to the new part of the property. The rest is late 1700 - no foundations!
As you said, 3 weeks of no rain and scorching sun has taken it's toll. No point doing anything with it until it's 'resettled'.
yeahdext
NotThamesWater
Looks like your slab grout is cementitious.
This means it has no elasticity, or ability to recover from induced stress;
anything moves, and you get cracks opening up.
Your best bet is to remove the cementitious grout from along the wall,
and replace it with a tough sealant, (not silicone as they have no tear resistance).
Without messing about with pro 2-part sealants, you should be able to find cartridge packed
1-part Polysulphide sealant in a decent Builder's Merchant.
You want the gap to be sealed to be wider than it is deep,
and you need to put some kind of tape, (electricians if nothing better to hand),
along the bottom of the gap to ensure your sealant is only anchored at either side.