basements Flashcards
What is a common cause of dampness in basements?
Penetration of moisture or condensation
Adequate ventilation and suitable wall and floor structures can help combat condensation.
What is the purpose of an impervious membrane in basements?
To prevent the penetration of moisture
This helps maintain a dry environment in the basement.
What type of concrete is recommended for waterproof basements?
Dense monolithic concrete
This type minimizes water penetration.
What are tanking techniques in basement construction?
Methods where water runs into tanks below the floor
However, these techniques do not protect against water vapor.
What is the purpose of a drained cavity system in basements?
To minimize ingress of water
This system allows for small amounts of water seepage while managing drainage.
What materials are recommended for forming a watertight basement?
Dense high quality reinforced or prestressed concrete
Good materials, detailed design, and workmanship are essential.
What factors affect the water tightness of concrete?
Water/cement ratio and degree of compaction
Proper ratios and compaction techniques are crucial for waterproofing.
What are concrete admixtures?
Substances added to concrete to modify its properties
They are not compulsory but can be used to address specific needs.
Name the diverse types of concrete admixtures.
- Water reducing admixtures
- Retarding admixtures
- Accelerating admixtures
- Water repelling admixtures
- Air entraining admixtures
Each type serves a specific purpose in concrete performance.
How do pumps in basements affect water levels?
They lower the water table and create hydrostatic pressure
This can cause the basement to float like a boat.
What is tanking in basement construction?
Providing a continuous waterproof membrane to the base slab and walls
It ensures complete continuity of waterproofing.
What materials can be used for tanking?
- Mastic asphalt
- Polyethene sheeting
- Biome compound
- Epoxy resin compounds
- Bitumen
These materials can be applied internally or externally.
What is the function of a drained cavity system in new and refurbishment work?
Accepts small amounts of water seepage through monolithic concrete wall
Water is collected and drained away to maintain dryness.
What is built alongside the inner non-load bearing wall in a drained cavity system?
A cavity is formed
This cavity can be either vapor tight or cavity ventilated.
