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Hi All,
this refers to Jonathan’s question earlier – I had problems posting a reply.

We have exactly the same issue with the corner of our roof corroding – the same area as in Marc’s photo. Is this called the fascia? It seems a common problem in our street.

I’m wondering what sort of tradesman to get in to look at it – a roofer?

Annalise

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Hi Annalise

Corrosion of the thin steel plates of the fascia panels can sometimes be a problem with properties on some estates suffering worse than others.

The front and rear fascia and the fascia surrounding the eaves are made from sheets of thin steel plate which have been riveted onto the upper steel frame of the building.
The steel plates have to be cut and formed into a box profile which can be a little tricky, plus you may find that the lower anchor points can sometimes be difficult to attach even for an experienced steel fabricator as corrosion may be present.
It can be easier to create a new timber box frame out of roofing lathe onto which the new steel can be fixed but I would expect that replacing the steel could prove to be very expensive as experienced steel fabricators don’t come cheap.
You will probably find that the steel covering the eaves at the side of the house will be in better condition than that at the front and rear as it tends to be the lower corners of the fascia that suffer most from corrosion, especially if they have not been painted regularly.

If all of this sounds a little daunting then you can opt to fit PVC fascia boards over the existing corroded panels. Fascia boards are much easier and cheaper to fit. The cost of materials for new PVC fascia boards should come in at around £150-£200 plus fitting. Fitting costs will vary but expect it to be between £200 -£300 but this can cost much more if your chosen UPVC fitters use scaffolding over ladders as scaffolding can easily add £1000 or more to the cost.
If UPVC is selected then there is no need to create timber box profile. All the fitters would need to do is affix lathe to the top and bottom of the selected area onto which the UPVC is fitted, the UPVC fascia boards have have a lipped edge which form a natural box shape once the lower soffit panels are inserted.

The existing steel fascia panels are not structural but they do serve to protect the underlying steel frame from corrosion through rain and wind.

Below are a few photographs that should help you in understanding how the original panels were fitted.

This first image shows the original roof frame. Note that where the top of the steel frame protrudes, it does not form a box onto which the steel fascias are added. Rather, it is the steel fascia boards themselves that are formed into the box profile.

 

 

 

 

bisf-frame-close-2

 

In this image we can see the location of the original rivets that help to form the eaves. There is no underlying frame here. The top of the steel panels is fixed onto the steel frame that overhangs the building.

 

 

fasciaHere we can see a simplified view of how UPVC Fascia and soffit boards are fixed to the building. This is how the new box shape is formed. The new UPVC fascia boars are simply attached onto lengths of lathe batten.

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