STRAEGIES TO REALISE GREEN BUILDING

1. Positioning of the building
Orientation (Positioning) of the building is one of the strategies of sustainable building design. Making  sure that the windows do not face either the east or west because this is the direction of the sun. The south and north are ideal.
The significancy of windows and doors facing the east and west, "When the sun rises in the morning, the heat will go through these openings into the house and keep it hot throughout the day and the same will happen when it sets in the evening thus keeping the house hot throughout the night."

2. Location of rooms
You need to bear in mind location of rooms. Having a living room or bedroom facing west or east is not a good idea in West Africa because we have a hot climate. But if your rooms or openings are facing this direction, especially because of the shape of your land, you need a canopy (covering) such as an extended slab or roof to shield them from direct sun."

Therefore, we should locate building services such as toilets, stair case and all inhabitable spaces to the east and the west; these will be used as buffers to the sun.

3. Long and narrow buildings

You should have buildings that are narrow and long as opposed to wide or round rooms because ventilation in such rooms becomes a challenge and so it needs artificial cooling, which will increase your expenses on artificial lighting and cooling.

Additionally, the Urban Energy Technical notes on green building read in part, "Buildings that are narrow in plan help to achieve maximum natural lighting penetration, good cross ventilation and minimise heat gain."

4. Sun shading

Sun-shading of all glass areas is another strategy of sustainable buildings design. To achieve this, you need to build an extended roof or slab over all glass areas of the house to prevent the effects of direct sunlight.

"It is the most important point when building in hot areas because glass allows short wave radiation which goes through glass so any heat that gets in through glass continues to build up which is why you will need artificial air conditioning."

5. Size of windows

Window sizing should be according to the prevailing climate conditions and being in the tropics or hot and humid area, it is advised that the windows should not exceed 30 per cent of the wall. "This will help in preventing heat gain in the house, which comes with using a lot of glass."

6. Finishing

For a tropical climate, it is recommended that you have your buildings smooth on the surface and light-coloured to reflect heat. "The colour of the building also matters that is why we advocate for light colours which reflect heat such as white mainly for the interior. Dark colours absorb light and heat so you tend to use more light and artificial cooling."

7. Size of walls

"All external walls should be at least 200mm thick, preferably, hollow blocks, to prevent heat from penetrating through. This keeps the heat away for a long time so the interiors remain cool."
8. Choice of building materials

Use local materials as opposed to imported materials. These have none or minimal maintenance, they can easily be harvested and are non-toxic so they have minimal internal pollution and damage to health and are also easy to recycle or to reuse.

9. Power source

It is recommended that you use renewable energy through solar power harvesting.

10. Water efficiency

You need to use water- saving fixtures such as dual flush systems and low flow taps. Instead of letting rain water to flow, you could harvest it and use it for various purposes such as watering plants and for cleaning. "This will reduce the pressure of using the piped water which is causing water levels to go down."


11. Sanitation

This calls for the need to have environment friendly toilets such as bio digesters, reed bed sewerage systems and oxidation ponds.

12. Waste management

Waste needs to be sorted out at the source and the biodegradable waste used to produce biogas is separated from the non-biodegradable waste which is recycled.

13. Landscaping

When landscaping, use local plants because these require minimal watering and manure instead of fertilisers, which is a chemical that will affect the soil structure and have long-term side effects.

It is also important that you use permeable or porous paving material to allow water to penetrate the ground. This will raise the water table.