DIY Doctor

Main navigation

Level with outside ground Foundation for garden room.

Postby dai jinks » Sat Feb 25, 2023 2:49 pm

Like others i want to build a man cave livable room and the end of the garden.
Its gonna be 2440 x 2440 x 2500 plus a small side extention same hieght for toilet and shower. (very cramped i know but doable).

I share a solid rear boundary brick wall 215 with some extra piers my side in it. ( it used to be a cavityless factory outer wall)
Its has pertruding double flat tile drip and a soldier coarse on across the top. Total 2650 high from ground. My side, there is damp on 1/3 because the niegbour has build up all sort on the other (a small high disused fish pond ).

I'm to make up off this wall a standard timber frame and flat roof.
My question is this so far;

I already have 175mm poly slabs for floor insulation.
I want the threshold of doors and the floor to be say 25 mm up from level with outside ground on completion.
I don't want to pour one big slab but rather build a 215mm block perimeter on a footing, then infill with the insulation slab to levelish with the blocks and my floor cover on top of that.
What do I need to additional do to make this level floor water and damp proof from the outside ground ( and underneath i guess) before I build my frame work on top.

Anyway thats me and my dream for this years nice weather. Any tips and guides be great.
dai jinks
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Sat Feb 25, 2023 2:23 pm


Simply Build It

Postby stoneyboy » Sun Feb 26, 2023 10:20 pm

Hi dai jinks,
Build your perimeter wall so the blocks are one course clear of ground level. Sand blind the floor base and lay DPM on it and up the blocks. Then infill with insulation and add wearable floor on top.
You should build away from the rear wall or you will get damp issues.
Regards S
Rank: Project Manager
Posts: 6318
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