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Disadvantages Of Green Roof

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G. ROOT BARRIER.
This layer prevents plant roots from reaching and penetrating the waterproofing membrane or insulation if there are any. Plants with aggressive root barriers usually penetrate the membrane in search of moisture.
H. PROTECTION BOARD.
The protection board is used to prevent any damage to the membrane until all essential components are installed. According to Tolderlund (2010), membranes are usually made of durable materials that are water resistant and have a thickness of between 1/8 - ¼ inches.
I. WATERPROOFING MEMBRANE.
This is the most important member in the green roof as it prevents water from entering the building. According to G. Wark, (2003), “a green roof can be installed with any kind of waterproofing system, but single-ply …show more content…
As such, the waterproofing layer is typically assumed to be a membrane”.
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TYPES OF GREEN ROOFS
There are two main types of green roofs; Intensive and Extensive.
I. INTENSIVE GREEN ROOF
According to Dinsdale et al (2006), Intensive roofs are usually more than 15 cm deep. This allow for the planting of larger plants like shrubs and even trees. This thickness of growing media, can be very heavy therefore, the structural integrity of the building which will carry this green roof will need to be considered first before this installation takes place or such consideration are made during the design stage of the building.
The intensive green roof requires a dedicated maintenance program including, watering schedule, irrigation and …show more content…
HIGH INSTALLATION COST: The installation cost is higher than that of the conventional roof.
II. HIGHER MAINTENANCE COST: Maintenance is also more demanding than in the conventional roof.
III. LIMITED THEORITICAL KNOWLEDGE: As seen in various studies, Public and private investors generally have little knowledge about Green roof, hence are careful not to delve into unknown “waters.”
IV. LIMITATION IN EXISTING ROOFS: Optimistic owners or clients who want to retrofit green roof installation in his/her buildings may be handicapped because the original structural designers did not consider green roof applications in their calculation. ___
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7. RESEARCH DESIGN
STUDY LIMITATIONS
-The visit to all West African countries may be limiting as a result of visa issues.
-Data gathered from interviews maybe misleading since there a lot of political issues in the construction industry.
- The respondents of interviews will need to be contacted before any interview can take place because of busy schedules.
- The study identifies green roof adoption in construction at its time. It does not attempt to predict any changes in the

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