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Concrete Fencing Posts
Rank: Member Joined: 2/20/2007 Posts: 767
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Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing: What size twisted bars should I use? What is ideal concrete mix? Is it possible to do it at home and save money. I need 200 posts. 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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Rank: Elder Joined: 7/26/2007 Posts: 6,514
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Following Business opportunities are like buses,there's always another one coming
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Rank: Veteran Joined: 11/20/2009 Posts: 1,402
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tom_boy wrote:Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.
Tried this sometime back. Did 50 of them using y10. Normal mix. The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now. still suspect they are part of a house nearby.....
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Rank: Elder Joined: 12/17/2009 Posts: 3,583 Location: Kenya
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Muheani wrote:tom_boy wrote:Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.
Tried this sometime back. Did 50 of them using y10. Normal mix. The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now. still suspect they are part of a house nearby.....  at least ulisaidia a neighbor put up a house - lakini why use chuma in the post, if its just for keeping in place barbed wire ama wire mesh, just do them without chuma. But I am assuming with the molds you have to make the labor and time needed it might just be cheaper to buy the same from the concrete mold guys by the road sides.
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Rank: Elder Joined: 7/26/2007 Posts: 6,514
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Cost difference when using treated wooden poles (the green ones)? Business opportunities are like buses,there's always another one coming
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Rank: Elder Joined: 12/6/2008 Posts: 3,548
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If anyone knows about the recycled plastic posts "eco-post" e.t.c, can't find them at hardware stores, what is your experience using them? delivery quantities, durability, cost e.t.c A New Kenya
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Rank: Member Joined: 2/20/2007 Posts: 767
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Muheani wrote:tom_boy wrote:Any construction engineer in the house? I need technical info on how to make durable concrete posts for fencing:
What size twisted bars should I use?
What is ideal concrete mix?
Is it possible to do it at home and save money. I need 200 posts.
Tried this sometime back. Did 50 of them using y10. Normal mix. The horror for me was after i put them into the ground and left them in for three days; i returned to find scrap metal thieves had brought them down, crushed them and stole the metal...in Katani when it wasnt as developed as now. still suspect they are part of a house nearby..... Oh my goodness. I had not thought of people stealing the chumas. I was obsessed with people stealing the wooden posts for firewood. Now what? I guess one has no other option but to use the flimsy plastic ones! 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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Rank: Veteran Joined: 4/4/2007 Posts: 1,162
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even the barbed wire gets stolen
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Rank: Member Joined: 2/20/2015 Posts: 467 Location: Nairobi
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Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.
The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.
Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.
Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).
So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.
One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.
1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy.
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Rank: Member Joined: 2/20/2007 Posts: 767
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kawi254 wrote:Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.
The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.
Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.
Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).
So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.
One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.
1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy. Thanks alot. Great info. 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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Rank: Elder Joined: 12/17/2009 Posts: 3,583 Location: Kenya
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unaweza weka bamboo instead of chuma saves on the worry of thieves
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Rank: Member Joined: 1/9/2015 Posts: 188
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nakujua wrote:unaweza weka bamboo instead of chuma saves on the worry of thieves  how safe is the barbed wire after fencing  shida mara mbili posts barbed wire
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Rank: Elder Joined: 12/6/2008 Posts: 3,548
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nakujua wrote:unaweza weka bamboo instead of chuma saves on the worry of thieves  I have a kibamboo in shamba, How is it done? A New Kenya
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Rank: Member Joined: 2/20/2007 Posts: 767
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Much Know wrote:nakujua wrote:unaweza weka bamboo instead of chuma saves on the worry of thieves I have a kibamboo in shamba, How is it done? Interesting concept. Do you mean I use bamboo in the concrete post? Is this bamboo supposed to be treated? What kind of bamboo? How thick should it be? Have you done it before? 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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Rank: Member Joined: 3/21/2007 Posts: 1
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kawi254 wrote:Not a construction Engineer but i did my research with the roadside guys along outering road, Kariobangi and KAPA Mombasa road last year.
The concrete mold you can have it made for you at 8K-11K per mold by the Juakali guys. Metallic mold is advised as the wooden one takes in moisture and wouldn't last i.e if you intend to be making the concrete posts for years to come. 3 Y8 bars per post is what they use to reduce costs, but i have seen posts with 4 bars which i guess results in more strength of the posts.
Depending on strength required/finances you can use 1:3:6 or 1:2:4 ratio for cement:sand:ballast.
Ballast size is your normal ballast used for construction, i believe 3/4 inch. To give the posts a smooth finish they will mix the concrete mixture with the very fine ballast (they call it dust). Was strongly advised to use ballast crushed by machine and not those ones done manually because you need an even size ballast (3/4 inch).
So that the concrete doesn't stick to the molds you will need oil to apply before pouring the concrete mixture into the molds.
One mold can do 3 posts per day if you push it i.e one very early in the morning, another at around 1p.m and last one late evening. Be careful on the curing time because if not done well they will get cracks soon after.
1 bag of cement will give you 3 posts. 1 post at the roadside will go for around 1,800/= (last year price). If you need to transport these posts your cost goes up so depending on your quantities your may decide to make on site or buy. I know I'm light years behind, but might you still have the contacts for these guys? I'm looking for someone who has the skill set in making the concrete poles.
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