Between the cellar and the sill to the porch, there is sill paper but also a small air gap (crack). How should the gap best be sealed? Anything else to consider?
 
  • Cupboard beside basement stairs with items stored on shelves, showing a gap between the basement and cupboard floor; radiator and lamp visible.
  • Small gap between basement wall and wooden sill above, with visible sill plate and shoes neatly arranged on top.
Hi, I'm not sure if I can help you, I have similar thoughts and problems. Have you received any good answers elsewhere? In my case, I have paving stones and sill logs, which should be less problematic since stone doesn't absorb moisture like concrete/leca blocks. The advice I've received so far revolves around using foam sealant. I was considering using lindrev but spoke with a carpenter who didn't think it was a good idea, maybe between the sill paper and wood, not between concrete/stone and wood. Foam sealant remains, but I'm generally against using foam sealant, so I'm interested if anyone has a better suggestion.
 
@RaskBjörn What was the issue with lindrev? And is the stance on foam sealant due to environmental reasons? I imagine the best would be to seal between the base paper and the wood. Considering inserting a träkyl.
 
MatthewCampbell MatthewCampbell said:
@RaskBjörn What was the issue with 'lindrev'? And is the stance on foam due to environmental reasons? I imagine the best would be to seal between the 'syllpapp' and the wood. Consider inserting a wooden wedge.
There was probably no real problem using 'lindrev'. When I think about it, it was likely more due to the holes being too large to seal with just 'lindrev', and that you shouldn't have it between wood and concrete/mortar without a capillary-breaking material in between. I avoid foam for environmental and health reasons, but also because I'm not so sure about its structural properties in all conditions or in the long term. The idea of a wooden wedge might not be so bad, maybe a wooden wedge and 'lindrev' between 'sylstock' and 'syllpapp' depending on the size of the gap, thanks.
 
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