Foam on timber is a bad idea, for those talking about open cell vs closed cell foam in this thread, beware, both are bad for timber. Im renovating s Victorian p

Foam on timber is a bad idea, for those talking about open cell vs closed cell foam in this thread, beware, both are bad for timber. Im renovating s Victorian property at the moment and when I run the simulations on condensation and vapour pressure etc etc… in several colder climates the system even with open foam accumulates enough moisture content in the wood to rot it. A large part of that is the cold bridging effect generating liquid water close to the wood which it soaks up much faster than it can release during the summer. Please always run a simulator for your climate before allowing modern materials near timber and or old properties.