Expanding Foam

[maah]

I need guidance in the jungle of foam sealant.
Firstly, I need to seal between a trim and outer panel where gaps occur because the panel is rounded.
Picture of the panel:

What is suitable to use for that?

Then, for a completely different project, I need foam sealant to fill a cavity under a floorboard where the only way is to drill a hole in the board and fill it. Can I use the same foam or are there foams for different purposes?

 

[hempularen]

Not sure if I understand the picture, but it looks more like you need some form of filler that is more malleable than sealing foam. Sealing foam is impossible to shape. It expands long after you've applied it.

The cavity under the floorboard can be tricky. If you fill in too much, the entire board can rise, and you'll get a bulge in the middle.

 

[Peter2400]

I use Biltema's stone adhesive with the accompanying gun for such tasks. The stone adhesive is just like regular foam, but it doesn’t expand as much (maybe 50%) and is pink. The gun provides full control over the amount of foam and lasts at least a year if you leave the can on the gun. I use the adhesive for most things I need to glue, such as plastic, wood, and metal. However, it requires high pressure for the bond to be strong. http://www.biltema.se/sv/Bygg/Kemikalier/Lim/Stenlim-2000029972/ http://www.biltema.se/sv/Bygg/Kemikalier/Verktyg/Fogskumspistol-2000023750/ For smaller joints and where finish is more sensitive, I use Tech7. https://www.byggmax.se/verktyg/lim-..._uQZQF82fT84t-xHpnCfLG7aZ32FvyBhoC-x8QAvD_BwE

 

[maah]

Thank you for the answers, now I'm a bit wiser!

 

[maah]

I don't know if I understand the picture, but it looks more like you need some form of putty, or "filler" that is more moldable than foam sealant. Foam sealant is impossible to shape; it expands long after you've applied it.

The cavity under the floorboard can be tricky. If you fill in too much, the whole board can lift, and you'll get a bump in the middle.

What's missing is a detail in the picture, maybe that's why it's a bit hard to interpret. The panel is mounted horizontally and vertically, and on it, I want to attach a trim and then seal the gap that forms.

 

[useless]

Foam is primarily an insulating material. To cover gaps and smaller holes, you need some form of sealant.

 

[maah]

Fogskum is primarily an insulation material. To cover gaps and smaller cavities, you need some form of sealant.

Here's another place I need to seal. Between the white vertical board and the timber.
Would window putty work?

 

[AskeHolst]

You need something flexible, wood moves. My best recommendation is some type of MS polymer, like Tec7, Spurflex25, LAseal, etc.

But consider if it's really a good idea to fill the holes, what is the purpose? It's hard to make it look nice and even harder to keep it looking nice over time.

 

[maah]

The purpose is to make it windproof. It looks the same on the other side of the standing stud. A patio door will go in the opening, it is a glazed conservatory.

I think this might work
https://www.bauhaus.se/multi-filler-250-ml.html#full-description

I will call Bostik and see if they have any good advice.

 

[vectrex]

+1 on MS-Polymer. I have only good experiences with Tec7!

 

[Cheesen]

Here is another place I need to seal. Between the white standing board and the timber.
Would window putty work?

[image]

Lindrev

 

[AskeHolst]

Filler and putty become rigid and won't follow the wood's movements, so they will detach/crack over time. You need a flexible sealant (like MS polymer). Stuffing as @Daniel Östberg suggests is not a bad alternative, but I think it might be difficult to finish neatly when it's a hole and not a gap.

 

[Plupp 173289]

Biltema has ms polymer in several different colors.

http://www.biltema.se/sv/Bygg/Kemikalier/Ovrigt/BT-Multibond-2000028571/

 

[maah]

Thank you for all the good advice. I have such a tube from Biltema at home that I'm testing with in one spot. Since there are quite large holes and gaps, I'll probably need to build up layer by layer.

See image, key for size reference

 

[Peter2400]

Thanks for all the good advice. I have a tube from Biltema at home that I'm testing with in one spot. Since there are quite large holes and gaps, I'll probably have to build it up layer by layer.

See picture, key for size reference

I still think the stone adhesive is best, you can preferably fill the bottom with foam, which dries quickly, and then apply the sealant on it.