Construction Tech - All Saints Flashcards
1
Q
Give an overview of the works specification
A
- Strip out of existing WC – including all M&E, cubicles, flooring, shelving, sinks, sanitaryware, windows ceiling covering
- Installation of new sanitaryware including 1no. new WC, new drainage, cubicles, M&E, sinks, hand dryers, windows, decorations
2
Q
How did the specify the strip out?
A
- Strip out existing fixtures & fittings (e.g. shelving, cubicles, doors, flooring, ceiling, etc.)
- Strip out M&E – lighting, hand dryers, ventilation
3
Q
How did you specify the installation of new WCs?
A
- Sanitaryware to be connected to fresh and foul water supplies
- Contour 21 back to wall rimless standard height WC pan
- Conceala 2 cistern 4.5/3 litre dual flush valve side supply
- Contour 21 seat no cover, top fixing hinges and retaining buffers
- Contemporary flush plate dual flush
- All fixed into existing waste pipework – new waste pipework as described before
4
Q
How were the cubicles fixed?
A
- Mark out centre lines of each partition, ensuring all verticals are plumb
- Attach D brackets to wall using screws and wall plugs, space evenly
- Position leg 100-150mm from front of partition, drill through and secure with T nuts
a. Place partition between the brackets 100mm above floor level
b. Drill through the partition and secure with T-nuts - Attach 3 brackets to middle pilaster
- Drill through partition and secure pilaster with T-nuts through D brackets
a. Secure leg to floor with a screw - Attach 3 D brackets to opposite wall using screws and wall plugs
- Position end pilaster 100mm above floor and drill through, secure with T nuts through D brackets
- Position header rail and drill through pilasters
- Attach bottom part of hinge plate via pre-drilled holes on pilaster
- Attach other part of hinge to door with T nuts via pre-drilled holes
- Hang door by slotting hinge parts together making sure screw is then fitted, add 2 rubber buffers to where door meets other pilaster
- Ensemble latch in pre-drilled holes
- Test door / lock to ensure installation is correct
5
Q
How was the flooring laid?
A
- Remove all fixtures / fittings – all sanitaryware
- Measure dimensions of the room
- Mark out all locations / measurements of the fixtures, fittings and sanitaryware
- Concrete underlay – due to breaking out of tiles floor slightly uneven so concrete was screeded
- Lay out vinyl as flat as possible, press into angle between floor / wall with bolster chisel to make a sharp crease
- When whole vinyl sheet is laid, lift edges and stick to sub-floor with adhesive – polyurethane based products
6
Q
What flooring did you specify?
A
- Polyflor Verona – safety flooring
- Came with warranty that stipulated non-slip throughout its lifetime
- RRL Pendulum test value = >36
o Anything over 35 is classed as non-slip safety floor
R Rating of R12 (suitable for public lavatories)
7
Q
How is the slip resistance of a floor calculated?
A
- Using a pendulum test – anything above 36 is classed as a safety / non-slip floor
- Verona PUR PolySafe flooring
- RRL Pendulum Test - >40 (wet test – 4S, Rubber/Slider 96) classification P3
R Rating - R12 - Wet slip resistance is sustainable throughout the guaranteed life of the product in adherence with HSE guidelines
- Pendulum arm swings slider over test sample in wet and dry conditions
- Readings taken referred to as British Pendulum Number (BPN)
- Higher the number, the better the slip resistance value (SRV)
8
Q
What items did you specify for a moist environment?
A
- Safety flooring
- Whiterock cladding for all walls
- Good quality ironmongery
- Extract fan
- Moisture resistant paint
- Moisture resistant plasterboard
9
Q
How did you advise that the ventilation was inadequate?
A
- The existing ventilation consisted of an air brick with external grille
- No mechanical ventilation was present
- I knew this did not comply with Approved Document F: Ventilation
10
Q
What ventilation did you install? What are the requirements?
A
- 2no. Vent-axia axial inline extractor fan with timer 240v
- Mounted in ceiling void
- Aluminium insulated flexible ducting – insulation required so that air temp maintained and vapour does not condense in duct
- Requirements – 15 litres per second per shower / bath, 6 litres per second per WC pan or urinal
11
Q
How did you specify the installation of drainage?
A
- Dig trench to appropriate depth (circa 900mm) and width (410mm – 110mm pipe, 300mm wider than pipe itself)
- Ensure 1:80 gradient – 25mm height fall per metre
- PVC 110mm pipework to BS EN 1566-1
- Lay pipework as follows:
o Lubricate connector and pipe
o Push connector onto pipe
o Lubricate receiving connector and open end of pipe
o Push next length of pipe into connector - Surround new drainage with 110mm pea shingle, backfill with selected as dug material, compacted in layer not exceeding 300mm
- Internally: 110m pea shingle, around pipe compacted in layer not exceeding 150mm, up to 215mm below finished floor level
- Covered over with new tarmacadam
- New pipework directly connected into existing foul water system
12
Q
How did the contractor dig out the playground?
A
- Used a jackhammer to break out the existing concrete / hard wear surface, to expose shingle, made up ground beneath
- Spades used to move material into buckets and set aside
- Contractor ensured exclusion zone and chapter 8 fencing around perimeter
- Wore appropriate PPE:
o Gloves
o Safety goggles
o Ear defenders
o Safety shoes
o Long sleeved work trousers & jacket with hi vis
o Head protection
13
Q
How did the contractor de-risk the project?
A
- PPE & risk assessments
- Working with competent persons
- Ensured all designs approved before proceeding
- Allowed for enough time within programme of works
14
Q
What building regulations refer to drainage?
A
- Approved Document H – drainage & waste disposal
15
Q
What approvals are required?
A
- Building control approval – approve laying of pipework and assessing of trench size, gradient before backfilling
- Approved inspector issued completion cert once all installation complied with regulations
16
Q
What approvals are required?
A
- Building control approval – approve laying of pipework and assessing of trench size, gradient before backfilling
- Approved inspector issued completion cert once all installation complied with regulations
17
Q
Did you opt for Approved Inspector or Building Control approval? Why?
A
- Approved inspector
- Generally more responsive / advisory than building control
- Provided a cheaper quotation
18
Q
Was there a requirement for accessible WCs?
A
- No – the school had accessible WCs elsewhere within the building
- Accessible WC was not possible due to the size of the WC area refurbished
19
Q
What certification did the contractor submit?
A
- All live electrical installation – NICEIC certification
- Building control certification
- Guarantee for the non-slip flooring
20
Q
What are the maximum fittings consumption for WCs, basin taps, sink taps?
A
- WCs – 6/4 litres dual flush or 4.5 litres single flush
- Basin taps – 6 l/m
- Sink taps – 8 l/m
21
Q
What wash hand basin & taps did you specify?
A
- 1200mm solid surface wash trough with 12mm grade laminated access panels and fascia to suit
- 3no. tap holes at 400mm centres – no further than 250mm from each end panel
- 3no. non concussive mixer taps, with a timer of 10 seconds
- Ensure tap temperature suitable for child use – 32 degrees maximum
- Ariston under sink water heater – 2kW 15ltr, allowing for new copper pipework and expansion vessels
o To BS EN 60335-2-35 BEAB approved, installation to BS EN 806-4
22
Q
What designs did you advise for infant school children?
A
- Correct height WC pans
o 300-305mm for 3-6 years
o 355mm for up to 11 years - Correct height sinks
o Early years – 500mm
o KS1 – 700mm
o KS2 / primary – 750mm
o Secondary / adult – 750-850mm - Correct height cubicles
o Early years – 1200mm
o KS 1 – 1350mm
o KS2 – 1500mm
o KS4 / adult – 2000mm - Temperature of taps – 32 degrees to avoid scalding children
- No exposed pipework – keep within vanity units / boxing
23
Q
What IP ratings did you specify?
A
- IP = Ingress Protection
- Classifies degree of protection provided by an enclosure for electrical equipment with a rated voltage of no more than 72.5kV
- Defined by British Standard BS EN 60529:1992
- IP65 – first digit indicates level of protection against ingress of solid objects, second digit is protection against liquids
