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I have that alot of thought and in the end have decided not to. I'm just not convinced you get enough bang for your buck insulating a concrete floor. I'm going to have carpet in the garden room with a fibreboard underlay. My house has concrete floor, built in the 40's so doubt that is insulated...

Ok thanks for the advice, I'll see what I find when digging. I think I will consider changing things slightly, increasing the depth of mot type 1 to 150mm as u mentioned and reducing the depth of the concrete to 100mm

Good point, was planning to compact the earth and then start to layer up with sub-base, sand, concrete. What would you suggest?

How did those all go mate? What foundation construction did you go with in the end? And what roof construction did you go with to accommodate the span? Building a snooker room myself at the end of the garden. Cheers, nick

How did this all go mate, I'm building my snooker room in Basildon, 9mx5.4m. i think I've made my mind up on a concrete slab but still just reassuring myself. Interested to know what roof construction u went with, obviously the span is pretty large.

Did the snooker room get done?? Any pics? I'm building one myself.

Soil type in my area is clay, my plan is, 50mm type 1 20mm sand Dpm 150mm slab, (100mm being above ground level) Thanks for ur help btw

Dis you use steel reinforcement mesh in your slab out of interest?

Do you think that steel reinforcement mesh is a must or is it a bit over the top.. slab is for a timber garden room, snooker room 150mm thick,

Yes that is what I'm going to do... and in fact it's 300quid cheaper to get it poured then to buy the ballast and cement !

Hi, Can anyone help me figure out how many bags of cement and ballast I will need to make a concrete slab 9.6mx5.4m 150mm thick. Mixture will be 1-5. Thank you.