Dear sifus,

Part of the external 3' wide walkway surrounding the external wall of my house is sinking. How to fix it? Thus far, I can only think of the layman method of doing it that is to hack the slab, refill and resurface. From Google search, there are technics such as poly level, mudjacking using expansion foam etc. I wonder if these services are available in Malaysia.

Here are the facts of the subject property.
1. 30+ years old single story bungalow.
2. Internal floor still intact because of rebar.
3. No rebar for the external 3' wide walkway.
4. The concrete slab sank about 3 to 4 inches or 8 to 10cm.

Did you repair this eventually? I'm planning to fix my parents place with the same issue

No I haven't.

Just hack and redo. Can DIY if got tools and some experience/learn youtube or get 2 Banglas for 4-5 day job. Otherwise get a contractor paukaliau. But small job like this they charge lumpsum.