ᐅ Prefabricated House Thermal Resistance and Related Factors – Is Insulation Necessary?
Created on: 20 Dec 2013 13:23
F
FutzelHello everyone,
My grandmother has a prefabricated house (built in 1976). According to the construction description/report, the exterior wall structure (from outside to inside) is as follows:
2mm (0.08 inches) plastic skim coat
20mm (0.8 inches) exterior plaster on expanded metal lath
25mm (1 inch) wood wool lightweight panels
Perkalor-Diplex insulating paper
13mm (0.5 inches) V100 wood fiberboard
90mm (3.5 inches) wooden studs, with
-----60mm (2.4 inches) mineral fiber insulation between them
-----30mm (1.2 inches) air layer
13mm (0.5 inches) V100 wood fiberboard
0.1 to 0.15mm (0.004 to 0.006 inches) polyethylene foil
9.5mm (0.4 inches) gypsum plasterboard
Thermal resistance (R-value):
On average 2.25 (m²·h·°C/kcal)
Worst spot: 1.45 (m²·h·°C/kcal)
Thermal transmittance (U-value): 0.39 kcal/m²
I don’t really understand the thermal resistance and thermal transmittance values. Are these values poor, average, or good? Is additional insulation necessary?
My grandmother has a prefabricated house (built in 1976). According to the construction description/report, the exterior wall structure (from outside to inside) is as follows:
2mm (0.08 inches) plastic skim coat
20mm (0.8 inches) exterior plaster on expanded metal lath
25mm (1 inch) wood wool lightweight panels
Perkalor-Diplex insulating paper
13mm (0.5 inches) V100 wood fiberboard
90mm (3.5 inches) wooden studs, with
-----60mm (2.4 inches) mineral fiber insulation between them
-----30mm (1.2 inches) air layer
13mm (0.5 inches) V100 wood fiberboard
0.1 to 0.15mm (0.004 to 0.006 inches) polyethylene foil
9.5mm (0.4 inches) gypsum plasterboard
Thermal resistance (R-value):
On average 2.25 (m²·h·°C/kcal)
Worst spot: 1.45 (m²·h·°C/kcal)
Thermal transmittance (U-value): 0.39 kcal/m²
I don’t really understand the thermal resistance and thermal transmittance values. Are these values poor, average, or good? Is additional insulation necessary?