DIY Doctor

Main navigation

Insulating between a solid external wall & plaster and l

Postby William Slatcher » Fri Feb 06, 2009 9:08 pm


We live in a victorian end of terrace, which has solid walls We are looking to insulate these walls without having to cause much disruption.

My idea is that their is still a cavity between the soild external wall and the plaster and lath approximately 50mm to 60mm in depth which could be filled, just like cavity wall insulation.

I am just finding it hard to find a product that i could use to inject or blow into this cavity, which is breathable but water resistant. I have found a product known as Froth Pak which is a closed cell slow rise foam which can be injected into the cavity but this is expensive.

Anyone with any ideas would be greatly recieved.


William Slatcher
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Fri Feb 06, 2009 8:58 pm


Simply Build It

Postby stoneyboy » Sat Feb 07, 2009 3:12 pm

William Slatcher,
At the moment your solid walls are breathing into the cavity behind the lathe and plaster lining. Sealing this surface with foam will lead to the internal surface of the walls becoming damp/wet leading mould and rot.
Filling the cavity with foam may cause the L&P lining to be blown off the solid wall, foam produces some pressure whilst it is expanding.
Suggest you line over the top of the L&P lining with foam backed plasterboard.
Rank: Project Manager
Posts: 4615
Joined: Wed Dec 10, 2008 6:44 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics