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Insulating to the inside is not necessary. If the concrete gutters are being removed, insulation can be placed over the backboard. Insulation is far more effective when placed to the outside rather than the inside.

Hi, I agree with Timmyjim. Spot on. You don't always have to extend the rafters, you can provide a backboard and insulate over the cut off concrete, costs slightly less. As the work is being done the first row of felt should be replaced and felt support trays installed along with bird combs...

Guide to concrete gutters: Taken from: How to Replace Concrete Gutters: The Right Way Note: I edited my original post and decided to just put the text in directly instead of a reference or link. This was due to spam denigrating my company (see below). The company referred to in the post below...

Hi, It would appear that the problem is caused by cold bridging. This is quite often exacerbated by retrospective cavity fill which polarises the cold spots caused by the concrete finlock gutters. Lining can never cure cold bridging, which is why it is usually better to remove the concrete...

Hi, Looking at you're picture it would appear to be a solid wall as I can see headers, however, sometimes this is not the case and it may be a cavity wall with headers to make it appear to be a solid wall. Looking at the cracks they don't appear to be new, so I wouldn't worry unduly. Your best...