Figure 6: Floor Layout
Configuration for a PVM House
(CIDB, 2019)
Figure 7: Dimensions and
Space Planning for the Plan
and the Section of a PVM
House (CIDB, 2019)
For PVM construction, connections strongly
influence the overall structural stability and
the robustness of the assembly of the PVM.
Therefore, connections should be designed to
transfer horizontal forces (e.g. those caused by
wind loading) and extreme forces in the event of
accidents that cause loss of support (Figure 8).
Adequate vertical shear transfer (for example,
as a result of wind-induced uplifts or differential
movements) between the units must be
considered to maintain the integrity of the system.
Figure 9 illustrates two extreme cases of loss of
corner support or intermediate support due to the
notional removal of part of the PVM ground floor.
During the construction process, the possibility
of misalignment of the floor, wall, and ceiling at the
joints between the PVM units, either horizontally
or vertically, needs to be considered. Details
regarding the interface between the PVM and in-
situ construction elements such as core walls,
staircases, corridors, and other parts of buildings
should be taken into account (Figure 10).
Along with the design and construction
process, MEP services should also be co-ordinated
at an early stage and all constraints for installation
and maintenance addressed to avoid impact on
finished works in later stages. It is crucial that the
upfront design is co-ordinated with the structural
prefabrication components. Necessary openings,
recesses, and concealed components in the PVM
should be considered for structural strength, fire
safety measures, and how they could be used
in other relevant designs. Continuity and system
integrity of all MEP services should be dealt with
accordingly.
Due to the modular nature of PVM, the MEP
system components might have to be connected
between PVM units. However, the connection
methodology (if used) should not compromise
the integrity and performance of the system. The
installation of MEP services should enable ease of
maintenance and account for future replacement
when necessary, as well as allocate sufficient
space to carry out installation, maintenance, and
future replacement work. Typical MEP services in a
building are fire protection, electrical wiring, extra
low voltage equipment (ELVs), lightning protection,
water supply, sanitary, heating, ventilation and air-
9