Job 1 - Roof and Loft Insulation

[TinRobot]

Hi All. I am renovating a 1960s very leaky bungalow and I need help to make it as warm as possible. I will break each element down into different threads if that is okay. 

 

Job 1 has to be the roof and insulation. The roof is being replaced and I will have an East, West and South Pitch. The North is a gable end. Currently I am thinking that TLX Gold will go on the roof. They offer to work out the U value I can achieve I think so will give them a call. For the ceiling I am thinking of 2 layers of 150mm Knauf insulation with a VCL fitted above. I was considering PIR but have worries about the gaps created for lights/cables etc. 

 

My questions:

 

1) Should I insulate the North gable wall in the loft (260mm) 

2) How can I remove potential thermal bridging around the wall plate area? I have seen "trays" that provide a air gap into the loft. I am not sure how many of these you need (every 1200mm?) 

3) With your expertise can you give me any other advice? 

 

Really appreciate any advice you can give. 

[joe90]

You really need to decide on a warm or cold roof, warm roof you insulate above rafters, cold roof you insulate at ceiling level. If you are not going to use the loft as living space then a cold roof would be my plan, no TLX just membrane, 300mm knauf would be good with trays at the eaves to leave ventilation up into the loft. No need to insulate the gable if the roof void is cold 🤔