Removing expanding foam

[Kayos]

We used to used some specific cleaner, one would dissolve dried foam but you needed to use the other stuff to clean the mess leftover

It also left yellow stains when some numpty tried to clean vinyl stickers off his van

 

[MrFluffy]

Timely thread, I just bought another house abandoned project and its made of stone, and apparently the owner/builder who cut in some new windows and put some lintels in thought it was acceptable to glue the removed stone back in with expanding foam!
Flat spade works good for digging it out and prising the stones out from it, but I'll be testing the chemical solutions mentioned here for cleaning the stone back up before mixing up a lime mortar and putting them back in properly.

 

[colnerov]

"now then now then"

Can you tell what it is yet?

 

[penfold]

Timely thread, I just bought another house abandoned project and its made of stone, and apparently the owner/builder who cut in some new windows and put some lintels in thought it was acceptable to glue the removed stone back in with expanding foam!
Flat spade works good for digging it out and prising the stones out from it, but I'll be testing the chemical solutions mentioned here for cleaning the stone back up before mixing up a lime mortar and putting them back in properly.

I'd be tempted to try grit blasting if you've a large area to clean.

 

[BrokenBiker]

Don't forget to install the concealed "security" cameras

Should have mentioned...9!year old girls play room lol

 

[Pete.]

I don't see why you have to actually get rid of ALL of the foam. Why not just the bulk of it, enough to allow ventilation?

 

[Barking Mat]

There's two types of expanding foam I believe, open cell and closed cell, many years ago a mate bought a merc 508 van and it was insulated behind the ply with open cell foam, it just rotted out everything, as it soaks up water like a sponge and holds it there. Professional spay foam people use closed cell, stuff out of can is open.

 

[BrokenBiker]

There's two types of expanding foam I believe, open cell and closed cell, many years ago a mate bought a merc 508 van and it was insulated behind the ply with open cell foam, it just rotted out everything, as it soaks up water like a sponge and holds it there. Professional spay foam people use closed cell, stuff out of can is open.

This is crap out of a can I think. Back there again today and got most of it off the walls wth a bolster. It's dripping wet but the areas previously cleaned back were bone dry. Most of it is gone now, bit more to do tomorrow to tidy it up ready for proper insulation. Can't wait to get this one done to be honest.

 

[moose]

When Steel boats are sprayed, that's the best foam of insulation I have seen, bit of prep work though, its the way I would go if I did another one, our present one has polysterene in sheets, but I found the bubble wrap with foil over the top sandwich with the top board the best.