Many people know the walls of many modern homes contain foam, but few have experienced the oddly satisfying joy of seeing it get there.

Footage shows one way: spraying it on like a can of spray paint. In the video, the white spray that hits the wall then expands rapidly into a thick layer of solid foam.

Ronan Catterson from Northern Ireland was working on a construction site in July when he recorded the footage.

"I thought it was pretty cool and different so thought I'd post it," he said.

The footage shows one of his colleagues spraying liquid foam insulation into the internal walls of a timber frame house.

Ronan Catterson, from Northern Ireland, was working on a construction site mid July when he thought he'd whip out his phone to film the application of insulation spray.

"I thought it was pretty cool and different so thought I'd post it," Catterson said.

Catterson filmed the satisfying video of one of his colleagues spraying liquid foam insulation into the internal walls of a timber frame house.