Silicone sealants commonly used in the installation of Windows, Doors and Conservatories.
There is much confusion about different silicone types, and not surprisingly as their descriptions give little in the way of clues as to the correct grade and type for a given application and there is not one single type of silicone sealant that should be used for everything.
Joint failure - the most common causes:
The wrong silicone was used
The joint width and/or depth was too great or too small
Excessive movement in the joint sealed
Contamination of surfaces - dirty materials
Poor gunning and application technique
Poor quality sealant
Weather conditions - if it's to cold the silicone will not stick
It is important to consider all of the above when sealing a joint. Make sure that the surfaces are clean and that all protective tape is removed and that there is no residue. Deep or wider than normal joints should be filled with foam packer rod.