Seal under the sill

[nossodo]

Made a mistake when installing the sill for the garage, being the beginner that I am. Only laid the tar paper-like strip but later learned that you should use the one that looks like a sleeping pad to make it airtight. As it is now, you can see daylight through certain spots, and it will draft there. It's not a heated garage, but I intend to keep it around 10 degrees, so it should probably be sealed somehow. Is there any recommended method to seal it?

 

[Gabbe1]

Expanding foam?

Otherwise, I believe that many gaps might decrease when the walls and ceiling are in place, as there will be good pressure on the sill then.

 

[hakaner]

Will you have an installation zone inside? e.g. 45x45?
Then you can put an EPDM sill seal under these
to seal...

 

[Forbo]

Can recommend Biltema's foam gun for 99.. and then you buy SIKA foam for the gun, incredibly smooth and easy to get the right amount of foam in the right place. Sealed between joists and ground floor this way, works great.

Otherwise, there is construction sealant, MS-polymer or regular construction silicone, or a rubber strip...

 

[Mikael_L]

If hakaners' suggestion doesn't work, use construction sealant:
http://byggkatalogen.byggtjanst.se/bostik_ab/fogmassor/bostik_silmax_byggfog_2620/i200312/
And insert a bead as best as you can between the slab and the beams. On both the inside and outside.
Moreover, if you can do as hakaner suggested, you should still apply a sealant bead on the outside.

Personally, I wouldn't start messing with foam sealant. :x

The narrow gap you have, especially in a horizontal plane, does not allow much air movement driven by convection, so insulation material there in the gap does very limited good.

Yes, that's what I would do anyway ...

 

[FredrikR]

However, roofing felt has been used for many years, and is still made?

 

[Forbo]

Sill paper has been used for many years, and is still being made?

The sill paper does prevent moisture, but it doesn't accommodate unevenness, sill insulation of "foam material" also seals.

Regarding mess with foam sealant: Foam sealant gun as mentioned... even someone like me who tends to make a mess can manage to apply foam sealant precisely and without mess with one of those

 

[Mikael_L]

Well, I haven't used anything other than those spray cans with a long plastic tube as the nozzle. I don't think they are suitable for any detailed work.

 

[magnu]

Sounds nervous.
Try using plastic shims between the concrete and the sill under the studs. That should suffice.

 

[nossodo]

Lovely, thank you for all the answers, it looks like there is hope to rectify my mistake.

 

[Mikael_L]

Sounds nervous.
Try putting plastic wedges between the concrete and the sill under the studs. That should suffice.

What is the function of the plastic wedges then?
How many and what size were you thinking?



@nossodo, yes, you can fix everything afterward. No problem.

You can get a mobile crane to lift the entire garage and slip a little camping mat under the sill before lowering it again.