Seal between leca and sill

[Tobias.hagg]

I have had to build up concrete blocks to fill in "holes" where there hasn't been a foundation stone. This creates a small air gap between the blocks and the sill of a couple of centimeters that needs to be sealed.
Do you have any ideas on the best way to do that?
I have already sealed a bit between foundation stone and sill with foam sealant. But I've been told that it's not good because the foam sealant draws moisture to the sill. Does anyone have experience with that?
/Tobbe

 

[Oldboy]

Sill board against the sill and then you insert mortar with a narrow pointing trowel between the Lecasten and sill board.
If there is a gap between the mortar and sill board once the mortar has dried, you will need to caulk.

 

[RaskBjörn]

I have a similar issue, but I have gaps between natural stone and sill beams. I find it quite difficult to completely seal by stuffing mortar/cement into small gaps. When it dries and some time has passed, it still isn't completely sealed, maybe because the wood moves with the seasons?
How did you solve it, Tobias? Did you manage to fix it well?

I'm wondering if expanding mortar could be a solution?

If you're going to caulk, isn't it better to do it between the sill paper and the sill?

 

[Spikrätaren]

If you have too strong a mortar, try a lime mortar, which has some elastic properties.

 

[Oldboy]

If you're going to insulate, isn't it better to do it between the foundation paper and the sill?

That should work too.

 

[Tobias.hagg]

I have a similar question, but I have gaps between natural stone and the sill plate. I find it pretty difficult to get completely tight by stuffing mortar/cement in small gaps, when it dries and some time has passed, it's still not completely tight, maybe because the wood moves with the seasons? How did you solve it, Tobias? Did you manage to make it good?

I'm considering if expanding mortar could be a solution?

If you're going to pack, isn't it better to do it between sill paper and sill?

Hello! I've had the problem a couple of times, and I've done it in two different ways. Both times I've placed sill paper against the "sill," then I've used mortar one time and foam sealant the other. Both work well so far.

/Tobbe