Roof Insulation (One Cast)

Lightherm Sceed is used as a lightweight topping screed to adjust floor level. In some projects, there might be concerns with the usage of conventional cement sand screed, due to its high density of 2100kg/m3. Lightherm Screed is an ideal lightweight alternative in replacement of conventional ones. Vodapruf has achieved (Inverted roof system) certification BCA stipulated u-value requirement for the roof application.

Based on a density of 250kg/m3, do refer to our mix table design for specific design mix.

A 50mm thick Lightherm Screed is being applied onto the roof (Inverted roof system) in accordance with Singapore’s BCA stipulated u-value requirement.

Layer Thickness (m) Conductivity, k (W/mK) Resistance, R (m2K/W)
Outside Surface, (R0) 0.0550
25mm thick cement sand screed 0.025 0.5330 0.0469
50mm thick Lightherm Screed 0.050 0.0670 0.7463
1.2mm thick Koster 21 waterproofing 0.001 0.0826 0.0145
150mm thick concrete slab 0.150 1.4420 0.1040
Inside Surface, (Ri) 0.1620
Total Resistance (RT) = 1.1287 R (m2K/W) 1.1287

– Thermal Transmittance (u-value) of roof, 1/R = 0.89m2K/W

– Maximum Allowable u-value of roof = 1.20m2K/W

– 0.89 < 1.20 (Pass)

Bungalow @ 90 Meyer Road, Singapore


Lightherm Screed as Roof Insulation Layer

Koster 21 is a multi-purpose waterproofing coating is being chosen as the single waterproofing product for this project, covering all areas including pitch roof, wet areas and water retaining structures.
Lightweight thermal insulation screed, Lightherm Screed, is chosen as an insulation layer on pitch roof. It is used as a ‘concealed system/inverted roof system’.
Roof area in total 400m2.

After Cement Sand Screed (Last Layer to Evenly Distribute the Weight Load)

Koster 21 is a multi-purpose waterproofing coating is being chosen as the single waterproofing product for this project, covering all areas including pitch roof, wet areas and water retaining structures.
Lightweight thermal insulation screed, Lightherm Screed, is chosen as an insulation layer on pitch roof. It is used as a ‘concealed system/inverted roof system’.
Roof area in total 400m2.


Completion of Paint Works

Koster 21 is a multi-purpose waterproofing coating is being chosen as the single waterproofing product for this project, covering all areas including pitch roof, wet areas and water retaining structures.
Lightweight thermal insulation screed, Lightherm Screed, is chosen as an insulation layer on pitch roof. It is used as a ‘concealed system/inverted roof system’.
Roof area in total 400m2.

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