150mm (min) precast
structural plank 300kg/m2 (min)
mass per unit area (Stowell Hollowcore HC 300 – 155mm
deep, 320kg/m2)
Ceiling
CT0 metal ceiling system
providing 150mm (min) ceiling void with one layer
of nominal 8kg/m2 gypsum-based board.
Diagram
shows CT0 type ceiling treatment.
*Please see guidelines for structural concrete topping
applied to reinforced precast concrete flooring overleaf.
Robust Details
are construction solutions which provide an alternative
to pre-completion sound testing as a method of complying
with Part E (resistance to the passage of sound) of the
Building Regulations (England and Wales). Stowell concrete
products enable builders to meet these regulations – provided
the correct treatments are followed – when constructing
new-build attached dwellings, flats and apartments.
A synopsis of the construction treatments is provided above, with full details
available from Robust Details Ltd (telephone 0870 240 8209 or www.robustdetails.com).
...for
guidance only
Guidelines
for structural concrete topping applied to reinforced
precast concrete flooring
1. Check topping design requirements; i.e. thickness and 28
days cube strength.
2. Check propping requirements. Units spanning less than
2.0m are unlikely to require propping.
– For units between 2.0 and 4.5m, provide a single
row of props.
– For units between 4.5 and 7.0m, provide two lines
of props. After the reinforced hollowcore units have been
placed upon bearings the self-weight is propped out before
the topping is applied. This means that the weight of the
unit and the structural topping are supported on props,
and no significant load goes on the bearings. Take into
account the loading from props onto the floor below.
3. Clear all rubbish, loose concrete, chippings, etc. from
the upper surface and clean out joints between units. NB:
Units in composite construction are usually ungrouted.
4. Keep upper surface well wetted for 24 hours before application
of topping concrete.
5. Clean off any standing water before application of topping
concrete.
6. Minimum 35N/mm2 concrete cube strength at 28 days (C28/35
max. 10mm aggregate S3 + A142 mesh at mid depth).
7. Leave the props in until cube strength is achieved OR
for at least seven days – and load with caution for
additional 21 days.
PHD/20065/25.08.06
Hollowcore
layout and load tables
To
satisfy Robust Details E-FC-1 (RSC) and
E-FC-9 (RSC)
A floor layout
arrangement using Stowell HC300 planks
clear
span... 6150mm
1150mm
4000mm
stairs
by
others
plank
lengths... 6350mm
1350mm
section:
H-H
section:
G-G
section:
G-G
section
P-P
section:
D-D
section
M-M
4200mm
Stowell
hollowcore flooring units are produced in the standard
155mm x 600mm section to a selection of lengths
ranging from 1.2 metres to a usefully long 7.0
metres – available
in increasing increments of 50mm.
This table refers to simple, uniformly distributed
loads and is only a guide...
HC
300 three core
Loadings
in kN/m2
Imposed
live load
1.5
2.0
2.5
3.0
3.5
4.0
5.0
7.5
Partition
allowance
0.5
0.5
1.0
1.0
1.0
-
-
-
Finishes
& ceilings
0.3
0.3
0.3
0.3
0.3
0.15
0.15
0.15
Max
clear span in metres
8mm reinforced
type A
5.40
5.30
5.05
4.95
4.80
4.95
4.70
4.20
10mm
reinforced type B
6.00
5.85
5.60
5.50
5.30
5.50
5.30
4.80
12mm
reinforced type C
6.40
6.25
6.00
5.90
5.80
5.90
5.70
5.15
16mm
reinforced type D
6.80
6.65
6.45
6.30
6.20
6.30
6.10
5.60
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