What is a good depth for septic where a 4 bed mansion and sq is concerned?

@A4architect,

Could you kindly explain what a waffle slab is and whether it is in use in Kenya for residential houses?

I have seen a certain company advertising it in the dailies and they claim to be able to help save 50% of the slab construction costs.

@ash ock..these are hollow blocks made of clay or concrete that are laid in suspended slabs so as to reduce the volume of reinforced concrete hence making the slab cheaper.

The ones being advertised are good as long as you involve your independent structural engineer to design for you.

The sellers also offer structural engineering services.

Their design is often rejected by my engineers. Coincidentally, both the langata building and kasarani building that recently collapsed had used these blocks.

The reason why both collapsed is coz both did not employ services of registered architects and engineers and not coz of the quality of the blocks .

Good people, can anyone advise whether a Mukinduri tree can produce timber for roofing. i got one on my plot where i'm planning to build a bungalow.

I doubt you will get any straight timber over 5 feet long from that tree.
You can use it for building a scaffolding though