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18 Analyze Figure 11.5. And say in what case a suspended concrete structure is possible/ impossible to build and explain your choice.

19 Read the questions people ask specialists from Peter Cox and suggest your own answers:

Peter Cox - UK Market Leaders in the repair and preservation of properties. Peter Cox, established in 1951 with almost 60 years experience in providing a range of property services, has built an enviable reputation as the market leader in the repair and preservation of all types of property from private housing to historic buildings.

  1. My ground floor is suspended timber. When it rains the area below the floor fills with water. What do you suggest?

  2. How to deal with damp in concrete floor?

  3. My house is over 100 years and sweats. This causes mould and rotting floors and walls. How do I stop this?

  4. When wood turns black, what does this mean?

  5. I have fungi growing under the laminated flooring under the sink area in the kitchen. The fungi developed after the washing machine leak. The fungi is pasta type color in different sizes. Is this dangerous? What can I use to clear it?

  6. What happens if I puncture the floor membrane?

  7. Is the only fix for water pressure under my basement concrete floor new footer tiles?

  8. Removed carpet, bare sub floor gets damp when humidity is up or it rains. No water lines run under it. It's about a foot away from any wall.

20 A) Read and translate the text: why are we still having problems with moisture and concrete floor slabs?

(after Howard Kanare)

Water is an essential ingredient in concrete, but uncontrolled excessive moisture can create a whole host of problems with concrete floor slabs. Some of the modes of distress include:

  • Adhesive breakdown of adhered finish floor coverings

  • Debonding of coatings

  • Osmotic blisters of epoxy systems including coatings and epoxy terrazzo

  • High pH (alkalai) attack of floor finishes

  • Microbial growths

  • Flooring expansion, such as cupping of wood strips or planks

  • Reactions between incompatible floor patching/ leveling materials.

Despite the development of many excellent, longstanding practices, there are still a large number of moisture-related problems. Some contributing factors include: design professionals specify a blotter/ cushion/ subbase layer over a vapour retarder; vapor retarders are not carefully protected during construction; concrete floor slab mixes often are made with smaller than desirable aggregate and mixes are not optimized for minimum shrinkage; inappropriate moisture tests still are specified; moisture resting is not always done correctly; some unreasonably moisture-sensitive adhesives are still on the market; there is no performance specification or test method for moisture resistance of adhesives or floor coatings; and failures of some moisture-suppression products occur because there are no performance specifications for moisture suppression products.

(CONCRETE CONSTRUCION, November 15, 2007)

  1. Find additional information on distresses listed and speculate on the remediation. Use the linking words/phrases from Appendix 1:

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