for elevated concrete slab, the use of steel deck is really the best approach. the problem is its too expensive ... flat deck (0.8mm thickness) 0.25m x 5m @ 200 per linear meter ; web deck (0.8mm) 0.98m x 5m @ 725 per linear meter ...
an alternative option is to fabricate your own steel deck thru a metal fabricator in your location that can bend GI sheet that are 8' in lenght or longer ... (1) buy a 0.8mm (or higher thickness depending on your requirement) GI sheet (size 4'x8'), price here in marbel is about 720 per sheet ... (2) the fabricator should bend the GI sheet at 90 degrees angle with alternating lenght of 113mm and 25mm. i used this measurement to get a 1M width (113x9=1017mm) steel deck that is 8' long. the 25mm (1") bend provides the rigidity in your deck. here in marbel, they charge 10 pesos per bend, but i was able to negotiate a price of 100 pesos per sheet for their bending services. so total cost per sheet was 820 which gives you a steel deck of 1m wide x 2.4m in lenght ... in the house we are constructing, each floor slab is 10m x 4.5m, by placing the mid-beam at the center of the slab, i was able to use 20 sheets for each slab which we connected to each other by spot welding it ... overall result, i was able to reduce my steel deck cost by 50% per slab ... something to consider if your building a multi level concrete slab ... cheers
Boo!
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that's interesting sir... can you post pics of this - the bended GI sheets and steel deck itself? thank you!
Correct me if im wrong. Ang pagkakaalam ko sa metal/steel deck sa design pa lang ng structural na consider na dapat ito. Where in you can reduce the reinforcement bar of the concrete slab. Pwede maging 30x30cm o.c. distance bothways ng bakal depende sa type ng metal deck na gagamitin. Compare sa reinf. Bar ng one way or two way slab.
mig21, i'll be receiving the next batch of fabricated GI sheet decks next week for the kitchen roof slab. i'll post a photo of the finish product ...
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bryan, you are absolutely right, it has to be considered during the design phase of the house to minimize on rebars. in the plan my friends made for me, steel deck was out because i know it was hard to get it here in tampakan. what drove me to use this fabricated GI sheets as decks was the amount of plywood and coco lumber i needed for the formworks of the slab which will be a waste after construction. a 10mx4.5m slab will consume a min of 25 plywoods. i need to pour 4 slabs, added to this, the living room roof is double volume which is about 6m high. the wasted cost for plywood and lumber is just too much for me to accept which is why i decided to use these GI sheets as decks. we did not change the slab specs with the use of the GI sheets, its still 10mm at 150mm spacing both lenghtwise and crosswise. the only change was to move the mid-beam to the middle of the slab. the 820.00 cost per sheet is worth it, to the savings i get from the plywoods, coco lumber, and kisame cost. add to it, the additional strenght the GI sheets gives to the slab and increase labor productivity.
Boo!
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hi sir boo
i'm also currently building my new house, but the price of steel deck in your area is outrageous
i also used steel deck at 1mm thickness for 430 pesos per linear meter here @ bukidnon
its good to know that you managed to improvise using gi sheets
gumamit na kami ng ganyan, di ko lang tanda ang costing, pero mabils sa erecition kaunti support needed during concrete pouring. Around 200sqm ang area kaya feasible.
irobuang, that is the problem of owners building their house in a place where there is no competition between suppliers ... we are at the mercy of the major player in the area ... the other small players just follow (reduce the amount by so much) the major player ... i could get the material at a cheaper price in davao, but as i was informed by my contact, i have to wait 2-3 weeks for it to be delivered in my place 🙁 ... no choice on my part but to "think outside the box" and resolve the issue with a viable option ... cheers
Boo!
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agree with bmac, erection time is faster using steel decks and you only need fewer support for the slabs when pouring. added benifit is that workers can work at the bottom of the slab (the 1-2 weeks for the concrete to cure) with the finishing activities ... this is the increase in productivity that i mentioned in my previous reply ... cheers
Boo!
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Mas maganda pa sir kung gawan nyo ng blog yung bawat part ng paggawa ng bahay nyo...FYI lang sa mga wala pang bahay gaya ko. hehe
miked, i did started a thread here under home building (tampakan house) on the progress of my house construction ... i'll make sure to add to it the specs of the steel deck that i had fabricated for the house that i'm constructing right now ... cheers
Boo!
Bookmarking ...... hoping to see pics of the steel-deck myself. Thanks.
just a note on the bending of the GI sheet, the bending is lenghtwise and the first bend is 113mm to achieve 9x113=approx 1m width of steel deck. you can adjust the 113mm and the 25mm bend lenght to your needs, the shorter the 113mm, the more rigid is the deck. before pouring the cement, use 1" (25mm) styrofoam to plug the space between the beam and the steel deck so that the concrete will not spill downward under the slab ... cheers
Boo!
this is nice sir.. appreciate the posting of pics. But the resolution/size seems to be a little too small... is there a way to post a bigger image? happy holidays to you and everyone in PHM 🙂
sorry about that :-), it was my first time to upload photos via safari on my mobile and i just use the default setting 🙂 he he he ... let me re-upload it again via my notebook this weekend ... cheers
Boo!
