Rebar

[cheeryble]

Hi

I was told yesterday premix cement comes in at about 2100baht/cu metre. Anyone confirm?

Instead of going into the minute detail of pricing for all the different sizes of rebar could anyone tell me a reasonable estimate for the proportion of concrete cost to add for rebar for normal concrete framed concrete floored housebuilding.

Ie the cost of the concrete is 100% and cost of rebarred concrete is (100 + R)% what is R?

I will then have the total material cost for rebarred concrete of [(100 + R)/100] x 2100.

Thanks a lot

ps: just thought I may start building a retaining wall held back with anchors made of the thinnest rebar.

The specific price of that would also be useful......

Edited September 3, 2011 by cheeryble

[PattayaParent]

Different elements (ground slab, upper floors, columns, beams, walls) have different percentages of rebar in the concrete so the figure you want will be dependent on the elemental percentage makeup of your building.

[cheeryble]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

[trogers]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

Try 280kg of rebar per m3 of concrete for a single storey house with beam spans of 4 x 5m.

[PattayaParent]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

Long time since I did any estimating but I would always take the averages per element and calculate it, which is only 5 calculations and much more accurate. Don't remember what they were now though.

[cheeryble]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

Try 280kg of rebar per m3 of concrete for a single storey house with beam spans of 4 x 5m.

Thanks for the best guess wow it seems a lot of steel to the uninitiated....

A rough idea of the cost?

[Nomad97]

"I was told yesterday premix cement comes in at about 2100baht/cu metre. Anyone confirm?"

Do you really want cement or concrete?

I was quoted 1,500 Baht/cu meter for road grade concrete (in Surin 2 days ago). Each cement truck can carry 6 cu meter. Steel mesh (not rebar) 2.5 meters wide by 50 meters long was something like 2,350 Baht per roll. Hope this helps.

[monty]

The price for the concrete seems pretty high. I reckon now you'll pay 1700 baht/cu m of 280 Steng Cpac (which you would use for structural parts).

How much percentage average of steel is ver hard to say.

example : 20 cm X 20 cm X 10 m high colum with 4 strands of 12 mm full steel rebar (roof bearing columns in Thai style bungalow) works out to roughly 700 Baht concrete and 1000 Baht steel.

Those averages stay true in groundfloor only bungalows, when going more floors the steel part gets much more expensive as more and bigger steel gets used in beams only slightly bigger (meaning only a little increase in concrete)

[cheeryble]

Thankyou both for the good information

Of course I meant concrete (I'm getting very Thai saying cement).

Maybe my friend who got that 2100 price was quoted for a single cu metre.

Wow surprised the steel comes to more than the concrete but hey why wouldn't it?

Cheeryb;e

[trogers]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

Try 280kg of rebar per m3 of concrete for a single storey house with beam spans of 4 x 5m.

Thanks for the best guess wow it seems a lot of steel to the uninitiated....

A rough idea of the cost?

Do not confuse the ground floor slab of a house with road construction. The former is a suspended slab resting on footings or piles and comprises of beams and slab. The latter is a concrete paving resting directly on soil and sinks and cracks as the soil settle.

Edited September 5, 2011 by trogers

[cheeryble]

Thanks PP

I'm just thinking of a rough average for housebuilding.....any idea?

Try 280kg of rebar per m3 of concrete for a single storey house with beam spans of 4 x 5m.

Thanks for the best guess wow it seems a lot of steel to the uninitiated....

A rough idea of the cost?

Do not confuse the ground floor slab of a house with road construction. The former is a suspended slab resting on footings or piles and comprises of beams and slab. The latter is a concrete paving resting directly on soil and sinks and cracks as the soil settle.

Yes thankyou I'm aware a self supporting slab needs heavier reinforcement than a road (though it's still useful to have road mesh prIces).

While we're here....I'm considering a self supporting single cast span not only for the floor but for the roof so if I want I can have a terrace or even a room on top.

However when I look at haw puks being built it looks like these slabs are about 10inches deep for a large (6-8metre) span. Think of the rebar and it sounds expensive...

Presumably with 4 metre spans it would be considerably less........but how deep?

What are the specs for a solid concrete roof/floor........additives, waterproof layer, drainslope?

The big question is, is a well made on waterproof long term?

Secondly, I said a single cast ground floor. Why wouldn't I use a beam and concrete plank construction? I an see this would reduce the water-integrity of a flat roof but wouldn't it be cheaper and easier in a floor which doesn't require waterproofing?

thanks

[trogers]

Two considerations. The grid between columns supporting roof structure and the usable area between the columns for living spaces such as bedroom, kitchen, dining and living rooms. The 2nd is that beams and slab will be the cheapest and lightest suspended concrete floor you can get for short spans.

Using precast panels for the floor can be done, but length of panels should not exceed 3.5m. All bathrooms and toilets should have cast-in-situ slab as coring through precast slab for drain pipes may cause failure.

[mrbojangles]

For info chaps. Just got my quote back for the flooring from the concrete company in Chaiyaphum. 1,550 baht per cu metre, total for 6 cu metres 9,300 baht. Additional costs of rebar and damp proof membrane which was 3,150 baht. Seems reasonable and so have just ordered it all today. These threads are always useful for at least having a "guesstimate" to work with.

[cheeryble]

Two considerations. The grid between columns supporting roof structure and the usable area between the columns for living spaces such as bedroom, kitchen, dining and living rooms.

sorry trogers without the verb I can't get the meaning of this bit

The 2nd is that beams and slab will be the cheapest and lightest suspended concrete floor you can get for short spans.

Do you mean the fully cast-in-situ floor is cheaper than beam and concrete plank?

Using precast panels for the floor can be done, but length of panels should not exceed 3.5m. All bathrooms and toilets should have cast-in-situ slab as coring through precast slab for drain pipes may cause failure.

Makes sense.....good thought.

[cheeryble]

For info chaps. Just got my quote back for the flooring from the concrete company in Chaiyaphum. 1,550 baht per cu metre, total for 6 cu metres 9,300 baht. Additional costs of rebar and damp proof membrane which was 3,150 baht. Seems reasonable and so have just ordered it all today. These threads are always useful for at least having a "guesstimate" to work with.

Thanks for the info

Seems my friend's 2100/cu.m may have been for a single metre (probably about right) lost in translation probably

I note your rebar is only a third of the price of the concrete unlike a previous post where the rebar was considerably dearer.

I presume by the low steel cost and membrane your concrete floor is not self supporting it's on a base and the steel just a grid?

Edited September 8, 2011 by cheeryble

[mrbojangles]

I presume by the low steel cost and membrane your concrete floor is not self supporting it's on a base and the steel just a grid?

That's correct.