I've got most of the vertical T&G cladding on my bungalow now.
It looks like this at the moment, I'm leaving the bits over the windows till last to use up the offcuts.
When I fixed the horizontal shiplap to the shed it was soaking wet, so I just tacked it on at first, allowed it to shrink over a few months, then moved the boards closer together.
I ended up with about 25mm shrinkage over 2m.
I've done the same with the bungalow, except this time I've bought a moisture meter.
This wall gets a couple of hours of direct sunlight every day.
Moisture content is 2% and the gaps have opened up.
This wall gets virtually no direct sunlight and is at 14%. The gaps have opened up, but not as much.
The plan was to pull all the boards off and bunch them up. You can see I've left the nail heads proud to make it easier.
Should I do that though ?
What if we get a monsoon and they all swell up again ?
The tongues and grooves are there to allow for expansion, so if it's down to 2% moisture and the tongues haven't pulled out of the grooves, should I just leave them as they are ?
Is there an official rule for moisture content and gap ?