Measurements show that in practice urea-formaldehyde insulated cavity walls have U-values of about 0.65 W/m2K instead of the conventionally calculated value of about 0.5 W/m2K.
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References
1.
1. J. B. Siviour, Theoretical and experimental heat losses of a well insulated house, 8th CIB Congress, Oslo (1980).
2.
2. CIBS Guide, Chartered Institution of Building Services, London.
3.
3. Swedish Building Code SBN 1975. The thermal conductivity of urea-formaldehyde foam when injected into building constructions (1975).
