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GBE Semi Basement Brainstorm
About:
GBE Brainstorm Semi Basement
About:
Site Location:
- London N1
Plot:
- occupying space between terrace gardens to N and S
Climate:
- London
- Urban heat island effect (UHIE) may have bearing on the site
- London N1
- UHIE may not be too intense
- sheltered in the courtyard created by surrounding terraces
- relatively less air movement than open streets
- Terrace backs to north bathed in sunlight may increase temperature of air in courtyard
Access:
- approx. 2 m wide gap between terraced houses,
- 2 m wide alleyway to plot
- Need for construction deliveries
- Palletts on forklift attachment
- 1m3 bags on forklift attachment
- Hose for concrete
- Deliveries will need some thought
- Too narrow for car parking and pedestrian access?
- Room for narrow car/van with sliding door?
- Room for bike and motor bike parking
- Room for waste segregation bins
- Removable/movable bin and bike store construction?
- Consider for other storage
- (little provision in building)
Sub-soil conditions:
- What are soil conditions?
- London, probably clay, possible back fill in back land plot
- What was previous use?
- Sub-soil pollution issues?
- Permeable pavement to minimise drainage requirements?
- If clay less likely
Partially overhung
- by mature deciduous trees to West and North
- Tree root extent suggest piled/screw/auger foundation may be appropriate
- But basement requires continuous wall and floor
- Some disturbance to tree stability
- Tree root water source may need compensation
- Will new drain runs interfere with roots?
- Flat roof needs easy access to remove leaves to avoid blockages every year
Canopy high enough?
- to permit construction without some branches being removed
- for air-flow and some summer evening solar penetration
- Autumn leaf loss will permit limited winter evening solar penetration
No section through block:
- so no knowledge of summer-solstice-winter morning-midday-evening solar access solar penetration
Building:
- semi-buried long strip, no windows in basement, light wells (see below)
- will require insulation from ground or potential occasional anti-condensation heating in summer
- 2 southerly high windows to upper floor (Living/dining/kitchen & Wetroom) on boundary
- Are restrictions imposed: ventilation opening? Opening casement projections?
- courtyard voids at both ends serving basement via full height sliding or folding doors
rooms to basement courtyards:
- West end east facing:
- Plant (potential heat and noise source)/
- Gym (humidity source),
- West end west facing
- Bedroom (humidity source)
- East end east facing
- AV room (Potential heat and noise source)
- Light surfaced courtyard may generate AV luminance problems
- (use Projection paint Goo Systems W21)
- Working in kitchen will cast shadows on activity
- Consider light pipe or borrowed light from stairwell
Rooms to upper floor of courtyards:
- East end east facing:
- Bedroom (humidity source)
- West end west facing
- Living, dining and
- kitchen (Potential heat, humidity, smell source)
- Roof and upper floor indicated as having no down-stand lintel or beam
- Permitting easy removal of heat from rooms
Roof is flat with small parapet:
- Roof light over stairwell?
- Ventilation opportunity?
- If there is solar access to flat roofs:
- Then need to protect from overheating
- By solar resistant high decrement delay building fabric or insulation
Basement construction:
- Basement walls:
- Likely to be insitu concrete or reinforced concrete block wall, internal insulation and internal drained tanking, (ineffective thermal mass in walls)
- Not dimensioned but greater than the 300 mm. upper walls
Basement floor:
- No information (any thermal mass in floor finish?)
Upper floor:
- Shows thin construction no down-stand beams and no lintels
- Probably Spanning N-S
- No E-W large service routes
- Could benefit from thermal mass
Upper wall construction:
- Indicated as 300 mm thick (insufficient) unless timber framed and fully filled with insulation
- If solar access is present:
- Then need to protect from overheating
- By use of solar resistant high decrement delay building fabric or insulation
Roof:
- Shows thin construction so beams if any are within roof thickness
- If solar access is present:
- Then need to protect from overheating
- By use of solar resistant high decrement delay building fabric or insulation
WC projection on north elevation upper floor:
- Is it cantilever over site?
- Will loose heat from large surface area
- May well be relatively cold and potential condensation risk
- Consider wet room as offsite pod with WC included
Internal basement wet room:
- Requires passive, active or mechanical ventilation consider heat recovery.
Water delivery and sewage/waste disposal in 6 locations
- Courtyards, Garden, Kitchen, Wet room, WC, Bathroom may be complicated and expensive
- No ducts or routes indicated: Floor and roof are likely to span from N-S so no E-W routes
Drainage of flat roofs:
- 1 RWP indicated in adjacent plot to North
- permission required/obtained?
- Could drain into courtyards to avoid water supply there
- Consider rainwater harvesting and permeable pavement.
Clothes Drying:
- Small kitchen unlikely to make provision
- 1 Garden, 1 alleyway, 1 covered access and 2 courtyards can make ample secure provision.
© GBE NGS ASWS BrianSpecMan aka Brian Murphy
26th November 2015 – 1st December 2015
GBE Semi Basement Brainstorm
Images:
GBE Brainstorm
GBE Brainstorm LondonN1Semi-Basement Issue 1
Text in left column is more up to date
GBE CPD
F132Basements PDF
GBE Robust Specification
Safeguard Basement Tanking Systems
© GBE NGS ASWS BrianSpecMan aka Brian Murphy
26th November 2015 – 3rd December 2017
