Research in energy efficiency incentives

[Drayton]

Or, if it doesn't run all the way along, they either forgot to go back and get it or could not be bothered removing it?

 

[Lacan07]

@Lacan07 thanks for such a detailed response. We have wooden boards across rafters as per pics. First time I’ve been up there since they did insulation; any idea why they have randomly put a bit with extra insulation rolled up against the rafters (circled in red)? I would have thought that would block it up there and pose a risk for condensation. Most of the wood feels dry to touch and we do have a few roof vents up there.

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That's odd, I would move that roll of insulation, just make sure there's sufficient air gap along the rafters.

Is there any felt above those wooden boards?

 

[NecessaryWing]

That's odd, I would move that roll of insulation, just make sure there's sufficient air gap along the rafters.

Is there any felt above those wooden boards?

As in between the tiles and those boards? Not sure. Those exposed bits in the upstairs rooms are definite cold spots so I’m keen to do something. How onerous is it to do to it from the inside only? I might try that first because there is barely any room in the loft and you can’t even stand up half way!

 

[Lacan07]

As in between the tiles and those boards? Not sure. Those exposed bits in the upstairs rooms are definite cold spots so I’m keen to do something. How onerous is it to do to it from the inside only? I might try that first because there is barely any room in the loft and you can’t even stand up half way!

Its all done from the inside of the room. You don't need to do anything in the loft, its already insulated at ceiling level. Its called a 'cold' roof installation so no need to mess about insulating the rafters.

Heres a photo of the rafters exposed in one of my rooms after I removed the lath & plaster, and then a second photo of the job half way through when I'd insulated between the rafters ready for the PIR to go on top.

 

[NecessaryWing]

@Lacan07 - thanks for info and pictures. Looks like a great job you did.

 

[fernicarry]

Heres a photo of the rafters exposed in one of my rooms after I removed the lath & plaster, and then a second photo of the job half way through when I'd insulated between the rafters ready for the PIR to go on top

How did you get the wood fibre boards to stay in place? Friction fit?

I have a stack of 80mm thick boards I bought ages ago that I need to find a job for. But they have a tendency to break up when forced into gaps.

 

[Lacan07]

How did you get the wood fibre boards to stay in place? Friction fit?

I have a stack of 80mm thick boards I bought ages ago that I need to find a job for. But they have a tendency to break up when forced into gaps.

Yes, its Steicoflex as opposed to the rigid Steico wood fibre boards so its a friction fit. You cut them slightly wider to provide the tension but not too wide, and obviously you need something to go over the top to keep them in place. I used PIR over the top, I could have used the wood fibre boards of course.