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Timber for formwork needed
Rongla
#1 Posted : Wednesday, February 24, 2010 9:17:10 PM
Rank: Member


Joined: 10/3/2008
Posts: 101
Hi Guys.Any ideas where I can gets used timber for formwork.Anyone selling please let me know. I need about 400m2 .Anyone selling props please give me a shout
Njung'e
#2 Posted : Saturday, February 27, 2010 7:19:14 AM
Rank: Elder


Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
400mm2...???...I hope you mean 400M square.Anyway,instead of buying,this days you can easily hire timber and props....Saves you lots of money.
Nothing great was ever achieved without enthusiasm.
Rahatupu
#3 Posted : Monday, March 01, 2010 1:27:49 PM
Rank: Veteran


Joined: 12/4/2009
Posts: 1,982
Location: matano manne
Rongla, Where are you?

I have props (1 week old so still wet) how many do you need? Niko Kitengela.

As for trappers you are better off hiring infact 1 inch will do you good depending on number of times you intend to use them. If you are doing multiple floors, you may consider metal trappers, they are excellent and do not wear as easily as timber.

You can get in touch: njorogexn@gmail.com
Rongla
#4 Posted : Monday, March 01, 2010 3:39:43 PM
Rank: Member


Joined: 10/3/2008
Posts: 101
Njunge wrote:
400mm2...???...I hope you mean 400M square.Anyway,instead of buying,this days you can easily hire timber and props....Saves you lots of money.

@Njunge
Thanks Njunge , I have taken note of that. Do you know anyone who hires out the formwork? What are the rates ?

@Rahatupu

Well, I will get in touch.

By the way, I will be doing 4 floors ,is it economical to make my own "Metal trappers" (as an investment) or leasing them will be alot cheaper?
Njung'e
#5 Posted : Monday, March 01, 2010 3:52:31 PM
Rank: Elder


Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
@Rongla,
Those i know are outside Nairobi and they might not be of use to you.Leasing is far much more cheaper but just in case you broke a bank,you can buy trappers with intention of using them commercially thereafter.
Nothing great was ever achieved without enthusiasm.
Rahatupu
#6 Posted : Tuesday, March 02, 2010 6:18:03 AM
Rank: Veteran


Joined: 12/4/2009
Posts: 1,982
Location: matano manne
@Rongla, @Njunge

The disadvantage with buying trappers is that 20% always wears off after slabbing, so the economies will not be realized. The ppl who lease use their own manpower to remove the trappers after you use them and are specialized in the trade so its not viable to buy with the intent of leasing after use

Metal trappers are better since they don't wear esp if they are oiled after use - lakini they are expensive to make atleast 750/= each (4*2 inch). So this is the way to go "in case tou went the G4S way:).

Props are cheaper to buy because they dont wear and need less care than trappers. The other timber 6*1 and 3*2 inch go for btwn 17 to 25 depending on your location, Kitengela seems cheaper to me.

Do the arithmetic given that hiring costs you 100/= per trapper for 40days. and buying 1 inch thick trapper will cost you 280/= to 320 (less 20%) 21 days after slabbing.
dudej
#7 Posted : Wednesday, December 08, 2010 9:56:46 AM
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Joined: 10/5/2006
Posts: 13
@Rahatupu Interesting how you could get steel trappers for about 750/- am having to make some for Sh. 1300 each (4X2). Cost of steel has skyrocketted
Stealth
#8 Posted : Wednesday, December 08, 2010 10:50:36 AM
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Joined: 5/3/2010
Posts: 145
Location: East Africa
I once saw a contractor spread rolls of black polythene paper on top of his timber before he poured the concrete for slabbing. When I asked I was told that it helps in preserving the timber and that the underside of the slab appears smoother than if it had no polythene. maybe @rongla cud do the same and incur less wastage with his timber for formwork.
dudej
#9 Posted : Friday, December 24, 2010 4:24:41 PM
Rank: Member


Joined: 10/5/2006
Posts: 13
Indeed steel formwork (trappers) provides a finer finish than wood. Also the trappers do not wear easily as @Rahatupu says. I am hiring mine out @ Ksh 120 pm if anyone wants (call 0735764242)
chegemwas
#10 Posted : Sunday, December 26, 2010 9:01:26 PM
Rank: Hello


Joined: 12/26/2010
Posts: 1
Location: Nairobi Kenya
dudej wrote:
Indeed steel formwork (trappers) provides a finer finish than wood. Also the trappers do not wear easily as @Rahatupu says. I am hiring mine out @ Ksh 120 pm if anyone wants (call 0735764242)


are yours steel formwork? If yes,what size is each and how does it cost
Pablo
#11 Posted : Saturday, January 01, 2011 8:15:56 PM
Rank: Member


Joined: 3/17/2008
Posts: 567
Location: Nairobi
@Rongla,

Any key learnings for on the trappers? Buy or hire, timber or steel.
Noted you had over 1600 Square meters of slab. (4slabs of 400SqM)
Tommy
#12 Posted : Sunday, January 02, 2011 8:11:57 AM
Rank: Veteran


Joined: 12/9/2010
Posts: 894
Location: Nairobi
Pablo wrote:
@Rongla,

Any key learnings for on the trappers? Buy or hire, timber or steel.
Noted you had over 1600 Square meters of slab. (4slabs of 400SqM)

@pablo quick arithmetics, he needs 400msq since he will be doing 1 floor at a time.(unless he has 4 const.) the polythene paper not only gives a smooth finish, but creates a water tight surface.
Don't wait for the Last Judgment. It happens every day. ~Albert Camus, The Fall, 1956
Tito44
#13 Posted : Wednesday, October 16, 2013 12:44:07 PM
Rank: Member


Joined: 12/16/2008
Posts: 111
I have seen some construction sites using trappers that look like block boards with a smooth finish. What are they? Are they cheaper than using say 9by1 or 8by1 timber for the trappers?
lexx
#14 Posted : Saturday, October 26, 2013 9:27:48 AM
Rank: Member


Joined: 11/24/2009
Posts: 130
and how much would it cost to hire form work (either Steel / wood) per SM?
jaggernaut
#15 Posted : Saturday, October 26, 2013 10:37:38 AM
Rank: Elder


Joined: 10/9/2008
Posts: 5,389
Stealth wrote:
I once saw a contractor spread rolls of black polythene paper on top of his timber before he poured the concrete for slabbing. When I asked I was told that it helps in preserving the timber and that the underside of the slab appears smoother than if it had no polythene. maybe @rongla cud do the same and incur less wastage with his timber for formwork.


My fundi insisted on wooden trappers (without laying polythene) since they produce a rough finish which makes plastering the ceiling easier. He said they would have had to chip/roughen the surface - if we had used polythene on the timber or used metal tappers - to enable plastering to stick on that smooth surface.
kamundu
#16 Posted : Saturday, October 26, 2013 10:41:58 AM
Rank: Member


Joined: 5/9/2011
Posts: 786
Location: Mashinani
jaggernaut wrote:
Stealth wrote:
I once saw a contractor spread rolls of black polythene paper on top of his timber before he poured the concrete for slabbing. When I asked I was told that it helps in preserving the timber and that the underside of the slab appears smoother than if it had no polythene. maybe @rongla cud do the same and incur less wastage with his timber for formwork.


My fundi insisted on wooden trappers (without laying polythene) since they produce a rough finish which makes plastering the ceiling easier. He said they would have had to chip/roughen the surface - if we had used polythene on the timber or used metal tappers - to enable plastering to stick on that smooth surface.


Thats a myth. @jaggernaut
Peace in our Homeland.
Rahatupu
#17 Posted : Wednesday, October 30, 2013 4:19:50 PM
Rank: Veteran


Joined: 12/4/2009
Posts: 1,982
Location: matano manne
Tito44 wrote:
I have seen some construction sites using trappers that look like block boards with a smooth finish. What are they? Are they cheaper than using say 9by1 or 8by1 timber for the trappers?



@Tito, they are called marine boards, abit expensive and wear fast as well. They are best when used with polythene as base so they don't soak much water.
yosie14
#18 Posted : Friday, November 14, 2014 10:30:40 AM
Rank: Member


Joined: 12/17/2013
Posts: 118
dudej wrote:
Indeed steel formwork (trappers) provides a finer finish than wood. Also the trappers do not wear easily as @Rahatupu says. I am hiring mine out @ Ksh 120 pm if anyone wants (call 0735764242)


@dudej. What would you advice me on making steel trappers for multiple use.So that they last long.
KCB,NMG,PAFR
tom_boy
#19 Posted : Thursday, August 27, 2015 4:39:48 PM
Rank: Member


Joined: 2/20/2007
Posts: 767
I am planning to put up a four storey apartment building. Have been thinking on ways to save costs. Has anyone considered using metal sheets as shutter for the slabs then re use it for doing the doors and gate. One can also use 4x2 and 3x2 cypress timber for the formwork support then re use these for door frames, roofing and wardrobes. Any thoughts on this? Pros, cons?
They must find it difficult....... those who have taken authority as the truth, rather than truth as the authority. -G. Massey.
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