What Are Composite Doors ?
Composite Doors take their name from the composite materials that make up the inside of the door. There are slight variations available, but most high quality composite doors comprise of a timber hardwood sub-frame that houses the composite material. The doors are typically hung in a UPVC steel reinforced frame.
The composite material inside is usually high-density foam such as polyurethane, which once inserted forms a hard solid core. This is a far cry from the almost weightless Styrofoam that makes up a UPVC panel. It is the high-density core of a composite door that gives the door its notable strength. Anyone who has tried to carry a composite door will testify to this; weighing approximately 75KG it is easy to see why these doors are generally considered impossible to break into! The standard thickness for a Composite door slab is 44mm, almost twice the thickness of a UPVC panel. Many customer surveys have indicated that after replacing a UPVC front door with a Composite there were notable reductions in heat loss and noise from outside was greatly reduced. The face of a Composite Door is usually a 3mm thick skin made up of GRP (glass reinforced plastic), UPVC or aluminium.
Composite doors with an aluminium face are waning in popularity and availability, as they are notoriously bad conductors. Composites with UPVC skins are also less popular as the skin is susceptible to the same downfalls as UPVC doors; warping under extreme weather conditions and also colour fade in direct sunlight.
The majority of notable Composite door manufacturers now use a GRP skin on either side of the door. GRP skins are available in a variety of colours, and importantly GRP is not known to fade or discolour in direct sunlight as UPVC does. GRP skins can boast a traditional timber grain effect, giving the appearance of real wood. This proves to be a big selling point for Composite doors, as they are a lot more resistant to weathering and age than wooden doors. GRP skins can be sprayed, however it is preferable to source a GRP skin that has a through-colour applied. This means the colour is applied at the time of manufacture, resulting in the colour running right the way through the skin. This eliminates any paint flaking or cracking, and means that a deep scratch on the face of the door should be easily remedied with a touch up pen.