Goo

Technically, it's "mousse expansive", or in English "expanding foam" but around these parts it's just goo.

Squirt enough of it into a hole and it will expand to fill all the spaces: a brilliant idea when you're dealing with a stone wall where much of the mortar has disappeared, or the gap between a stone wall and a brick wall where no serious attempt has been made to join the two.

Our kitchen wall has these sorts of issues, so for the past week I have been squirting goo like it's going out of style. It takes a week, because after you fill one gap you have to wait for the goo to harden before you can fill the gap next to it. I think we are getting close to having the problem sorted, because now I dont feel a breeze anywhere when I pass the back of my hand in front of the wall.

The Kitchen Wall. Most of the joints had
at least one hole the wind blew through

Put enough goo into the hole and it works

its way outside. Then you know the job's done.

So far I have used three cans on the job, but once it is done we can insulate the wall with laine verre (glass wool) safe in the knowledge that not only does the goo stop the wind, it stops water as well.

Simon