Using multifoil under steico insulated roof

[Gus Potter]

2 minutes ago, JamesP said:

Perfect timing from Gus

My timing, spelling,  grammer and choice of language etc is often well below the mark, but thanks for that.

 

12 minutes ago, JamesP said:

We can cope during the day but night was a challenge. Would consider Solar glass and external blinds next time. The AC is great especially  if you have PV.

On 06/09/2025 at 21:33, lookseehear said:

We’re in the final stages of planning our re-roof.

But have a look again at your roof make up, just in case you have missed something fundamental. The last thing you want is you SE turning round and saying, we never signed off on that. 

 

I do like how you are taking the time to get your U values and material build up sorted and it's clear to me that you have put a lot of time and effort into this, I admire you. 

 

If it turns out you need to resolve an SE issue then you will  be able to adjust as you have already put in the hard work.

 

Onwards and upwards, you are on the right track!

 

 

 

 

12 minutes ago, JamesP said:

We can cope during the day but night was a challenge. Would consider Solar glass and external blinds next time. The AC is great especially  if you have PV.

I love your idea of external blinds, easy to maintain, passive over heat protection. 

 

You could retro fit when your glass units start to fail? 

 

I was on holiday recently in Lake Garda and stayed in an "ECO hotel" They made much use of external blinds.. which were not that Architecturally unappealing. Yes it's a different mind set but cf the cost of special coated glass and the inevitable replacement cost then it seems like not a bad deal. 

 

For all.. see when you get fancy glazed units.. the warranty is often 7 years.. so ask if they fail how much is that cf some external blinds, brise soleil for example.

 

21 minutes ago, JamesP said:

Perfect timing from Gus, On top of the 200mm rafters I counter battened 70mm C16 to then fix the Fibre board and add another layer of insulation.

Every external wall and roof had 11mm OSB fixed on the inside before batten and plasterboard. That was our racking layer.

Bet your house is roasty toasty,  a joy to live in and won't be falling down any time soon. A house like yours could still be standing in two hundred years or more if maintained and kept dry.