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FEATURE ARTICLE 151
‘R’ values for the building type
(roof and wall) and climatic
zone. By utilizing R = L/K (L is the
thickness and K is the thermal
conductivity of the insulation
product), insulation thickness can
be calculated.
The following are ways in
which insulation can be applied
to buildings.
Photograph 2: Steel-roof building insulation Roof Insulation
Photograph 3: Roof overdeck insulation with PUF slab and spray system The roof can be insulated
by doing an underdeck or
will be considerably reduced. calculations concerning the overdeck insulation. In the
However, in case a building is not thermal conductivity ‘K’ of case of underdeck insulation
insulated, there cannot be a way insulation material. Also, a of reinforced cement concrete
of stopping the heat from coming selection of optimum thickness buildings, GI channels are installed
inside. This in turn will result in is essential. Optimum thickness from the inside of the roof and
the compressor running for a is the thickness that gives the fibrous insulation materials
longer duration, meaning higher minimum total cost. Total cost such as bonded mineral wool
electricity consumption. comprises the cost of insulation of density 48 kg/m3, wrapped
material, cost of installation, plus either in polythene sheet or with
In a way, thermal insulation has the present worth of electric aluminium foil lamination, is
become a necessity to stop the energy consumption cost. The placed between the GI channels
heat ingress during summers for cost of insulation increases and held in position with criss-
the purpose of creating comfort linearly (Lins) with the thickness cross GI wiring. Finally, gypsum
and saving energy. of the insulation; and the cost of or cement fibre board is fixed to
electricity consumption decreases the GI channels. This way the
Thermal Insulation with the insulation thickness (the insulation becomes sandwiched
System Design decrease is rapid at small Lins and between the finishing board
increases gradually at large Lins). and reinforced cement concrete
A thermal insulation system The thermal mass (density) of ceiling. The insulation material
design starts with the selection insulation is important for energy should be non-combustible as per
of a thermal resistance ‘R’ value savings; hence the use of critical BS: 476 Part-4 also, because it is
of the roof and walls; here, the mass of insulation is important. applied inside, it should be water
optimum ‘R’ value has to be repellant so that any moisture
considered. The optimum ‘R’ How to Determine trapped by condensation should
value is the thermal resistance Optimum Insulation not create problems in the future.
that, while maintaining thermal Thickness? Another method of underdeck
comfort, minimizes the total cost insulation is using rigid insulation
of electricity consumption and Due reference should be taken materials with aluminium foil
insulation. ‘R’ determines the from the ECBC to determine lamination of 32 kg/m3 density
extent or thickness of insulation the thickness. ECBC provides which can be directly fastened
which is based on mathematical using GI washers on to the
reinforced cement concrete. This
system is suitable wherever there
is a false ceiling. Rigid foam is also
fire safe and has Class O fire rating
as per BS: 476 Part-6 of the fire
propagation test.
Similarly, for metal sheet roofing
of a pre-engineered building (PEB)
DECEMBER 2017
‘R’ values for the building type
(roof and wall) and climatic
zone. By utilizing R = L/K (L is the
thickness and K is the thermal
conductivity of the insulation
product), insulation thickness can
be calculated.
The following are ways in
which insulation can be applied
to buildings.
Photograph 2: Steel-roof building insulation Roof Insulation
Photograph 3: Roof overdeck insulation with PUF slab and spray system The roof can be insulated
by doing an underdeck or
will be considerably reduced. calculations concerning the overdeck insulation. In the
However, in case a building is not thermal conductivity ‘K’ of case of underdeck insulation
insulated, there cannot be a way insulation material. Also, a of reinforced cement concrete
of stopping the heat from coming selection of optimum thickness buildings, GI channels are installed
inside. This in turn will result in is essential. Optimum thickness from the inside of the roof and
the compressor running for a is the thickness that gives the fibrous insulation materials
longer duration, meaning higher minimum total cost. Total cost such as bonded mineral wool
electricity consumption. comprises the cost of insulation of density 48 kg/m3, wrapped
material, cost of installation, plus either in polythene sheet or with
In a way, thermal insulation has the present worth of electric aluminium foil lamination, is
become a necessity to stop the energy consumption cost. The placed between the GI channels
heat ingress during summers for cost of insulation increases and held in position with criss-
the purpose of creating comfort linearly (Lins) with the thickness cross GI wiring. Finally, gypsum
and saving energy. of the insulation; and the cost of or cement fibre board is fixed to
electricity consumption decreases the GI channels. This way the
Thermal Insulation with the insulation thickness (the insulation becomes sandwiched
System Design decrease is rapid at small Lins and between the finishing board
increases gradually at large Lins). and reinforced cement concrete
A thermal insulation system The thermal mass (density) of ceiling. The insulation material
design starts with the selection insulation is important for energy should be non-combustible as per
of a thermal resistance ‘R’ value savings; hence the use of critical BS: 476 Part-4 also, because it is
of the roof and walls; here, the mass of insulation is important. applied inside, it should be water
optimum ‘R’ value has to be repellant so that any moisture
considered. The optimum ‘R’ How to Determine trapped by condensation should
value is the thermal resistance Optimum Insulation not create problems in the future.
that, while maintaining thermal Thickness? Another method of underdeck
comfort, minimizes the total cost insulation is using rigid insulation
of electricity consumption and Due reference should be taken materials with aluminium foil
insulation. ‘R’ determines the from the ECBC to determine lamination of 32 kg/m3 density
extent or thickness of insulation the thickness. ECBC provides which can be directly fastened
which is based on mathematical using GI washers on to the
reinforced cement concrete. This
system is suitable wherever there
is a false ceiling. Rigid foam is also
fire safe and has Class O fire rating
as per BS: 476 Part-6 of the fire
propagation test.
Similarly, for metal sheet roofing
of a pre-engineered building (PEB)
DECEMBER 2017
