Insulated plaster board question

[Beagle boy]

Evening everyone
I’ve recently moved into a new home as a doer upper.
There is a bed room on the back that is an extension, the rest of the home isn’t too cold but the back bedroom my teenage daughter is in is a bloody ice box. From what I can see it does have some insulation In the cavity’s.
In my last house I renovated I went with insulated plaster board (50mm) on all the external walls.
Do you lads think 25mm insulation on the walls and ceilings would make a noticeable difference?
I’m also have a new heating system and re wiring in may so I’m hoping that will help aswell

Cheers Rob

 

[Caberfeidh]

Is there a draught coming up through the floorboards?

 

[bullet chucker]

A thermal shooting device may tell you?

BC.

 

[Druid]

Definitely worth doing, make sure you seal all the gaps, corners etc as airtightness on those external walls is key. I’d go for at least 50mm insulation, more if you can lose the space.

As above, what’s the floor? Ground or first floor? If suspended timber above a cold spacethen lift the boards and sort that. Dpc draped over the joists dipping in between and filled with rock wool.
If ground floor concrete then you may want to insulate on top of it. Try a thermal camera as mentioned above. I did, very enlightening.

 

[Kane01]

A thermal shooting device may tell you?

I actually know a bloke that got the VAT of two of his thermal spotters because he used them to find insulation points.

 

[charlie222]

On one if my external walls I studded out 50mm and filled with kingspan. It's made a noticeable difference and if you're rewiring/plumbing you can run pipes and cables in the stud work. As has been suggested, floor and cieling probably wan't doing too.

 

[Oldstalker]

Definitely worth doing, make sure you seal all the gaps, corners etc as airtightness on those external walls is key. I’d go for at least 50mm insulation, more if you can lose the space.

As above, what’s the floor? Ground or first floor? If suspended timber above a cold spacethen lift the boards and sort that. Dpc draped over the joists dipping in between and filled with rock wool.
If ground floor concrete then you may want to insulate on top of it. Try a thermal camera as mentioned above. I did, very enlightening.

The key words here are about being airtight; you do NOT want "interstitial condensation" where the temperature gradient across the insulation leads to condensation within the insulation. Believe me (retired Chartered Surveyor - albeit a Land Agent) please? But yes it is worth doing with a damp proof membrane as a vapour barrier.
Airtight does not mean no ventilation in the room though!

 

[Beagle boy]

Is there a draught coming up through the floorboards?

Nothing that I can notice, there was a good draft coming through where there was an old sink. But since I’ve took that out and filled in I can’t see anything.