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Roof repair

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Good Morning All

This is my first post seeking a bit of advice if possible.


We have a detached house originally built in the 1800's and extended in the 1980's. We had a survey completed when we bought the house which indicated the following...



The roof structure located over the original front of the property appears to be of original oak timbers. Whilst restricted inspection of the inner roof structure was only able to be undertaken there is no evidence of significant sagging or deflection of the external roof surfaces. It is noted that there is evidence of past woodboring activity which is common in older properties. This does not appear to be on-going in the limited areas where able to be inspected, with no structurally significant damage being caused. You are however, recommended, along with refurbishment of the property to undertake timber treatment of the roofing timbers throughout as a precaution to guard against possible future damage occurring. 

The underside of the roof tiles is provided with a bitumen-based underfelt, as viewed from within the roof space area. Bitumen-based underfelt of this type tends to degrade at eaves level where exposed to sunlight and weathering.  If deterioration occurs within this location and moisture enters below the tile surface, this could cause deterioration of fascia boards and also possible internal dampness. Due to height the condition of the underfelt could not be verified. 

We are planning to insulate the loft area (Currently 🥶) and started to inspect the area closely. Our findings are included in the following videos.




It seems like the bitumen felt has came away and the tiles no longer lap (due to weather?) and therefore require repair. We also have rotten fascia boards and soffits creating a lovely opportunity for insects to get in (3 huge old dormant wasp nests 1 of which was treated last year). 


My main question is:


  1. Can the holes be repaired from inside the loft space by shuffling the tiles over, and putting the bitumen sheet back into place with an adhesive flashing tape type of product or would the tiles need to come off the house from the outside to fully inspect and replace the bitumen sheet if needed?


Any advice much appreciated, cheers all. 

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If the bitumen has dried up and started falling apart then you are better taking the lot off and re doing it. You will just end up with loads of wet insulation and a bigger headache

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