WHAT MATERIALS ARE USED TO WATERPROOF ROOFTOP SLABS?
Rooftop waterproofing is crucial for protecting buildings from water damage, leaks. Choosing the right waterproofing materials for rooftop slabs is essential for maintaining the integrity of structures.
1. Bituminous Membranes: These are one of the most popular choices for rooftop waterproofing. These membranes consist of layers of bitumen, reinforced with materials such as fiberglass or polyester, and are applied in hot or cold forms.
2. Liquid Applied Membranes: Liquid applied membranes are fluid-based waterproofing materials that are applied directly onto the rooftop slab surface. Liquid applied membranes are typically made from polymer-modified asphalt, polyurethane, acrylic, or epoxy resins.
• Tolerant to saline and black water
• Great for landscaping in coastal areas and those with poor eater quality.
• Dense
• Great for golf courses and high end residential homes.
HOW YOU AS A CLIENT CAN QUICKLY CHECK THE QUALITY OF SAND DELIVERED TO YOUR SITE
Bookmark and Rt
• In our previous thread we have highlighted the types of sand available in Kenya and their uses.
However, how do u know that you have quality sand?
Here are simple checks
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1. HAND TEST
• Rub the sand sample with wet palms
• Clean sand doesn't stick on your palm
• Sand that has silt (clay) sticks and changes your palm's colour.
• With the help of your structural engineer should test the silt content which must not be more than 8%
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2. SILT TEST
• Take a glass of water with uniform diameter, add sand and stir. (In Ombachi's voice, DONE!)
• Give it an hour
• Clean sand settles and a topl layer of silt forms
• Thickness of the silt layer shoulf not exceed that of sand by more than 8%
• Take about 6% for the following professionals
Architect
Structural engineer
Quantity surveyor
MEP engineers
Lawyers
Land surveyors
EIA experts
Landscape architects
2. Foundation
• About 15%
• This cost would go higher if you're building in 'abnormal' conditions such as steep slopes, swamps etc
3. Building skeleton
• This entails; slabs, columns, beams, staircases, roof etc
• This eats up about 25%