Lecture notes
Ground Floor Approaches for Domestic Buildings
- Institution
- University Of The West Of England
Lecture notes on Ground Floor Approaches for Domestic Buildings including ground bearing slab and suspended flooring
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Ground Floor Approaches for Domestic BuildingsFloor systems – horizontal planes that support live & dead loads
- Provide a degree of thermal insulation.
Functions of Ground Floor:
Structural stability (supports live/dead loads)
Thermal insulation
Durability (satisfactory lifespan)
Provision of appropriate surface finish (level & smooth finish)
Factors Affecting Selection:
General nature of construction form
Nature of site
Anticipated loadings
Required surface finish
Cost
Rising Damp
- Water within ground or from penetrating damp is absorbed by
permeable materials/building assemblies
(foundation/floor/basement),
- Rises within the materials by capillary action.
2 Types of Domestic Ground Floors:
1) Ground Bearing Slabs
2) Suspended Floor Systems
Ground Bearing Slabs
In-situ concrete slab resting directly in contact
with ground surface.
, Does not add to dead loads applied to foundation.
Primary Components:
- Hardcore
o Reduces capillary action
o Thin layer of sand laid over hardcore
- Concrete Slab
o With lightweight, wire steel reinforcing mesh
- Thermal resistance layer (insulation)
o Closed cell (airtight, water resistant)
o Open cell (water/air permeable)
o Can be positioned in different parts of assembly.
- Various barrier membranes
o Dependent upon design choice & arrangement of slab &
insulation
o DPM (Damp Proof Membrane)
Prevent moisture rising up from ground into the assembly
o Vapour Barrier/Vapour Control Layer
Prevent water vapour from interior escaping into assembly
Damp Proof Membrane
Barrier against rising damp which can be above/
below concrete slab.
Damp Proof Course
Barrier, usually formed by a membrane built
into the walls of a property, typically 150 mm
above ground level, to prevent damp rising
through the walls.
Types of Design:
Concrete slab ABOVE insulation
OPTION 1: Insulation above DPM
Slab acts as thermal mass
o Retains heat through sunlight exposure/heating periods and releases it
during evening/non-heating periods.
Allows insulation that is not moisture resistant.
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