Washington, DC – The US Polyisocyanurate Insulation Manufacturer’s Association (PIMA) has published a bulletin outlining the performance differences between foil-faced isocyanurate boards and mineral wool board.
PIMA said that the insulation or R value of foil-faced polyiso boards ranges from 6.0 to 6.8/inch (24.5mm). This compares with an R value of 4/inch for mineral.
Polyisocyanurate boards meet the requirements of US NFPA 285 fire tests for commercial buildings in the US and can be specified for a wide variety of code-approved building assembly options by architects and specifiers, said PIMA.
Additionally, polyisocyanate boards can are non-porous unlike mineral wool, its insulation value is independent of whether the board is wet or whether there is air flow or water vapour transmission, PIMA said.
Polyisocyanate boards are lower density than mineral wool insulation at the same R value, which makes it easier to handle and can allow for faster insulation than mineral wool, says the PIMA. Finally, polyisocyanate has greater compressive strength than mineral wool options, says the PIMA. This, the group adds makes it more resistant to on-site damage.
PIMA added that mineral wool includes building products known as mineral fibre board, stone wool and rock wool.
Look out for the Insulation and refrigeration feature in the October/November issue of Urethanes Technology International Magazine.