I'm replacing the sill and half a meter on the posts due to rot, the sill rests on stone blocks, should I have a moisture barrier under the sill?
 
You should lay syllpapp underneath and then it will be fine, but buy a "thick" syllpapp and not a "thin" one, and it will be great.
 
Thank you for that!
 
There is now also sill insulation in rubber that I can recommend since it also evens out smaller gaps.
 
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