Extension doesn’t stay warm

fenwick458

how about fit an electric plinth heater in the kitchen. 2.4Kw heater will cost you £65 per year if you set to run for 2 hours a day on a timer for the coldest 3 months of the year

JoeLowe

Also says the following if this helps with advice:

Jeepers_Creepers

100mm Celotex is great. There is no point trying to add to that - it wouldn't be cost-effective, and you wouldn't notice the difference.

Doozergirl

100mm was regs back then.  If you have spotlights in a ceiling as thin as the picture shows, then it's compromised by means of having great holes punched in it...

FreeBear

Doozergirl said: They are pretty widely available to hire! 

https://www.jewson.co.uk/p/flir-i3-thermal-imaging-camera-JTH07250 - Not the cheapest of places, so worth shopping around.

JoeLowe

Doozergirl said:

100mm was regs back then.  If you have spotlights in a ceiling as thin as the picture shows, then it's compromised by means of having great holes punched in it...

Suggestion?

Doozergirl

JoeLowe said:

Doozergirl said:

100mm was regs back then.  If you have spotlights in a ceiling as thin as the picture shows, then it's compromised by means of having great holes punched in it...

Suggestion?

Funnily enough, a thermal imaging camera to see where the heat is definitely escaping. 

But plug the gaps with celotex and surface mount any light fittings or have wall lights.  

johnferrier

do your velux roof windows have vent's in them? they might be open?

JoeLowe

JoeLowe said:

Just looking through my paperwork for the house and can see the roof was insulated with 100mm celotex.

It also mentions 12.5mm to plasterboard as an internal finish. 

They do but they are closed and we have blinds on the windows as well.

mclaren32

Pull out those spot lights and have a look into the ceiling, it should be very easy to see if there actually is 100mm of celotex.

We have a 30sqm extension with substantial amounts of glass, including a vaulted ceiling with 4 velux. The ceiling has at least 150mm of celotex and it’s one of the warmest parts of the house, needing less heating than we have specified.