Aluminium roofing in Kerala – a case study We did roofing(GI & aluminium) for our home recently. It was done to protect already existing concrete roof from harsh weather and also avoid leaking. My location is in kerala and a good percentage of houses here have aluminium roofing. Reason of extra protection for concrete roof […]
Aluminium roofing in Kerala – a case study
We did roofing(GI & aluminium) for our home recently. It was done to protect already existing concrete roof from harsh weather and also avoid leaking.
My location is in kerala and a good percentage of houses here have aluminium roofing. Reason of extra protection for concrete roof is the weather itself. Humidity is high here & continues rain during monsoon & also relatively hot summer.
And because of high demand, there is no lack of advertisements about aluminium roofing brands on TV. Top Aluminium roofing brands with presence in kerala include Everlast, Oralium, Tata, Jindal, Hindalco.. and list goes on.
Type of roof designs – design and cost.
2 main different roof designs are widely used in kerala. Hip roof and gable roof. One is little more costlier that the later. Local language for hip roof is കോടി.
If you choose gable roof design, there will be 30% decrease in cost compared to hip roof. Not only the reduction in cost of material, there is a huge reduction in labour. Also hip roof construction requires more skilled labour.
In Case of hip roof iron pillars are installed on all 4 sides of the roof. In gable design pillars are installed on center and 2 sides. Even Though costlier, hip roof design is more attractive to look at and roof is covered on all sides in same level. But in case of gable roof we need to take care of 2 ‘open’ sides.
There are some other designs also- like pyramid hip roof and flat shed roof. And obviously flat shed roof design is the most affordable.
Different Types of materials and longevity.
2 main materials used for this is GI and Aluminium. While choosing material, make sure about quality, type and brand.
For example 1 inch square pipe is available in minimum 3 different thickness. Also many different brands also available.
Contract whole work to someone or not?
It is a big decision. You have 3 options.
- Buy materials and give out whole work on contract basis – it is the best option according to me because you get the best of both world. finding supplier and making big purchase decisions – It is little bit tiring. But since you are dealing with supplier directly, you can save little bit of money there.
- Give out everything including material cost as a contract – this is the easier option. Just talk with few trusted contractors and get quotes. Make sure to thoroughly discuss every detail(most tricky part). Otherwise there will be dispute about materials, work etc.
- Buy materials and hire skills workers on daily wage basis – this is also a good option. But make sure that electricity is available during all times. Because if electricity is gone all work will be stalled.
Price/Cost of materials.
As mentioned above, materials are available in large variety of quality and sizes. Thickness is the main reason for quality difference in both aluminium sheet and GI pipes.
Aluminium sheets are available in many different thickness. But too much thickness does not mean best quality, because it adds weight to the whole structure.
GI round pipes, square pipes and rectangular pipes are also available in different thickness.
You don’t need to worry too much about this(if you are doing purchase yourself) because both of these items are priced based on its weight. More thick means more weight and hence more costly. So just buy according to what skilled workers demand. But if whole thing is given out as a contract work you need to make sure that good quality materials are used.
Cost of installation and labour.
Cost of installation approximately will be half of the total cost. That means if you are buying materials worth around 1 lakh labour cost will be around 75,000 to 1 lakh. But obviously based on your experience and skills in searching for better offer on material, finding skilled labour, ability to supervise and manage workers etc, you can significantly reduce the labour cost. You can also get some discount on material also. Following is a rough estimation of cost based on area of roof.
500 square feet area aluminium roofing cost.
Hip roof – 50,000 to 75,000.
Gable roof – 30,000 to 50,000 rupees
1000 square feet area aluminium roofing cost.
Hip roof – 100,000 to 200000 rupees
Gable roof – 75000 to 125000 rupees
15000 square feet area aluminium roofing cost.
Hip roof – 150,000 to 250000 rupees
Gable roof – 100000 to 150000 rupees
2000 square feet area aluminium roofing cost.
Hip roof – 175,000 to 3,00,000 rupees
Gable roof – 150000 to 200000 rupees
Proper way of installing pipes to concrete roof.
Proper way of attaching GI pipes to concrete is by drilling and installing base plate using anchor bolts first. Then welding gi pipes to them. After all work is over it is recommended adding concrete reinforcement to the based of all pipes.
Drain pipes! use them or not?
This is something you need to consider seriously. Because installing will add few thousand rupees to total budget. But the reason not to install drain pipes is not money. If you are installing aluminium roofing on the second or third floor, cleaning it will become a big problem. Leafs, small sticks etc will start to get stuck on it. In summer it is not a problem. But during monsoon it will get clogged. Small insects and cockroaches will make it its home. Another issue is trees like banyan tree will start growing in pipes
Some people use drainage pipes with net on top of it to avoid such issues. But that will not solve the problem completely.
So it is better to avoid drainage pipes. Make sure that the roof little extended on all sides to avoid rain splatters.
But that does not mean drain pipes are totally bad. If you have no other option, go ahead and install it.
Choosing color of sheets
Color of roof will affect the look of the house for sure. If it is on second or third floor, impact on overall look will be less but still it will make a difference. Bright colors like red or blue will give more punch to the whole house. Colors like grey will not steal all the attention. At Least It will be nice if color of roof matches with color of house itself.
Cost of labour and material will take 90% of the budget. But there is some other costs also. This include cost of transportation, painting, Amount to be payed to electricity company(for example in case of KSEB you need to let them know about use of equipments like cutter, welder etc. And you have to pay some money also- around 200 rupees per day for permission to use heavy duty tools- it is unfair because we are already paying for extra electricity being used) etc.