1. Flexible caulking and sealing compounds

1.1 Older, less efficient products

We'll just mention them for the record, as they're very inefficient and more or less obsolete. However, they can still be found on existing buildings, during renovation, and it's a good idea to be aware of them, if only to replace them before they give way.

1.1.1 Linseed oil putty

This putty was mainly used for glazing.

It's a very inexpensive product, but has no elasticity. Initially soft, it hardens by oxidation in air, and this hardening...