What are the specifications for laying a concrete floor indoors?

Question

How much hard core, depth of concrete and where do I place the Damp Proof Membrane, etc?

The project is the conversion of a stone out building into living accommodation.

Answer 1

Excavate the required depth to allow for 100mm hardcore or crushed concrete. Sand blind for 25mm to fill any voids.Lay 10000 gauge polythene membrane. 50mm of polystyrene insulation board. 100mm of 4;1;1 concrete and finish 50mm of sand cement screed. In addition any drainage etc should be installed below the membrane level.

Answer 2

If your shed is 10x5 you will need about 3/4 of a yard of concrete for a 4" thick floor, you can have it delivered from the quarry which wil cost you about 350 for the mix plus delivery plus short load fee or mix it from bags, you will need about 40 sixty pound bags, form up the floor out of 2x4's making two boxes both 5x5, this way you can use the bags and pour one half at a time, take your concrete mix dump them on the ground in the form dry, get almost the entire form filled 7/8 of the way then start adding water mix with a hoe or a rake until you get a plastic like consitency, dump in more dry and add water until you have the form a little over full, take a 2x4 crown up (bowed side up) that is long enough to reach the from board of each side, run the baord across the top moving it side to side try to keep a little bit of the mix in front of your screed board at all times if you get a hole or low spot just throw some concret in that spot and go back over it. Once you have done this have a wide plank like a 2x12 that can preferrably reach to the other side of the form from where you are now standing lay this board on your forms, get a good wood float and start to trwoel your concrete always keep your leading edge (direction you are moving float in) raised slightly up, move float in half circles overlapping each seam trying to work to the edge. Once you have done this to the entire slabe repeat on the other side, remove the wood board in the center if you want and replace with a fiber or pvc joint you can find at home depot. You will know when you are floating the concrete correctly it will start to pull the cream up to the surface giving it a nicer appreance, if you you want it smooth use a steel or mag trowel. But always rember to wet your float before you start, and wash often during the process, Do not pour on a very hot day or you will run out of time to work it out. don't let anyone scare you about concrete, take the right steps and it will be hard work that was well worth it, or if you are in NJ call us and we will do it for 900.

Answer 3

This Site Might Help You.

RE:
What are the specifications for laying a concrete floor indoors?
How much hard core, depth of concrete and where do I place the Damp Proof Membrane, etc?

Answer 4

You should pour 4 inch thick concrete slab.Under the concrete you should have at least a 6 mill plastic for your membrane. Under that i would put sand or pea stone gravel. I've poured a lot of concrete in MI.

Answer 5

I really want to assume you mean an ON GROUND SLAB.

Without any details of your intent however; I suggest the first thing you do is check with local code enforcement agencies; etc. to determine what works; or is suggested for your location.

Also without details it may be difficult to imagine the WHERE and WHY of the situation. It sounds like this is a RETRO FIT.

Steven Wolf

Answer 6

lay about 6 inches hardcore and vibrate flat with a wackerplate then lay poly membrane take it up wall edges and lay 4in wet concrete level using straight edge, trim membrane when the floor has hardarnd

Answer 7

atlas cement co. no longer recommends pouring directly on plastic...i dont know why because we have done this for many years...so i would put down the plastic and then enough crushed stone to bring you up to grade so that you can pour 4 in. of concrete...i prefer stone to gravel because you can wheel and walk on it without disturbing it and making ruts with a wheelbarrow...

Answer 8

excavate to a depth of 450mm then lay 150mm of hardcore ...blind it with sand ..then125mm polystyrene sheet ..then polythene membrane ..turned up at all sides ..then concrete ..either 125mm and trowel smooth ..or 100mm with light tamp finish then lay a tight screed on top with sharp sand....this will comply with uk building regs

Answer 9

BASICALLY ITS WHAT TOPMAN SAID ABOVE BUT THE INSULATION THICKNESS IS 100MM .AND DONT BLOCK ANY AIRBRICKS UP BELOW GROUND LEVEL THAT ARE FEEDING OTHER ROOMS

Answer 10

STONE BASE, THEN LAY MESH WIRE & SPACER BOARD AROUND BASE OF WALLS THEN POUR 6-INCHES OF CEMENT