We will never recommend this practice as it does not matter how good the condition of your existing roofline may be it is always possible that the timber may hold some moisture and by covering or capping over with uPVC you are with holding that moisture and ultimately aiding the rotting process.
However, we will always give the customer what he or she may desire offering the correct advice to aid them in making the right choices.

Once we start your installation we will carry out a full inspection of the timbers that we intend to fix to, if rot is discovered then we simply cut away the offending timber and replace the damaged section with new treated timber to allow for a secure fixing.
Within reason this is done at no extra cost to the client, however we will always advise if a serious rotting problem is discovered and will stop works until a full survey has been carried out by a competent building surveyor, this is a very extreme circumstance and would need to be funded by the client.

We will always recommend that the roof space and eaves are ventilated to allow the roof to breathe, this is particularly important if the roof has some kind of living quarters.
There are a few different options to achieve a cross ventilation in the roof, so if slots in the soffit isn't to your taste, why not consider hiding the vents on top of the fascias? You will get the same results but without it being visible.

All works (installations) are guaranteed for ten years against any faults such as gutter leaks.
However some products have a longer guarantee on certain things such as colour fastness, which in some cases can be as much as 50 years.

The majority of work is carried out off of traditional scaffolding due to Health and Safety.