Internal Insulation thickness

B

bamboozle

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I've gotta decide on which thickness of insulated plaster board to go with, 65mm or 75mm, architect recommending 65mm as the rooms are not exactly huge, i'm just wondering insulation wise if there is a huge difference?
 
Why are you paying an architect if you are deciding yourself?
 
This seems to be a problem with some architects.....they do a great job eith regard to design, people flow, layout, light etc and I for one are greatful they do.....but they sometimes do not give the correct advise in terms of heating systems insulation electrical systems etc. They should be able to quote proposed running costs for a house with the design based on a price per liter of fuel and unit of electricity

In an answer to your query I think you should ask him to give you the numbers with regard to the extra insulation, I think though that the thickness of the insulation is directly proportional to heat transfer rate (U value, but I am open to correction).....the size of the rooms has zero to do with the heat transfer rate through the walls.....all it means is that it will heat up quicker as there is a smaller volume. But if the insulation is not up to scratch then you will keep the having to pump heat into the room to keep it at the desired temperature.

Rgds
Inchy
 
Simeon said:
Why are you paying an architect if you are deciding yourself?
Click to expand...

we're paying the architect to come up with the ideas for us to choose from! he comes up with the different ideas and we choose what we like most and more importantly what's affordable!
 
If you go to the Kingspan, Ballytherm, or Xtrathem websites you will find the U values of the various insulation thicknesses. We did 60mm against a plasterboard. Also, getting the insulation and plasterboards separate was cheaper than buying a prefinished insulated plasterboard.
 
It is true that the U valve is on the PDF for each product but I still find it very hard to compare the products

I was looking at TW52 from kingspan for my walls. (block on flat)

The figures on kingspan include the plasterboard. ie 50mm of kingspan +12.5 of plasterboard.

on Xtrathem the figures quoted exclude the plasterboard.

comparing only the thermal conductivity of just the foam

Xtratherm XTb/tl is quoted as 0.019 and XT/Tl is quoted as 0.023 (thermal conductivity)

Kingspan TW52= .027

Assuming plasterboard is the same
Is xtratherm better?
 
Dutchy, how did you stick the plasterboard to the insulation. Or did you batten/mushroom fix it?
 
phester said:
Xtratherm XTb/tl is quoted as 0.019 and XT/Tl is quoted as 0.023 (thermal conductivity)

Kingspan TW52= .027

Assuming plasterboard is the same
Is xtratherm better?
Click to expand...

Yes, but I'm sure there will be a hefty premium on the price for the difference.

For u-value and thermal conductivity, smaller is better.
 

Xtratherm XTb/tl is quoted as 0.019 ........... Where??

when internally insulating.... ensure the internal insulation DOES NOT exceed 0.5 times the cavity insulation....

if you do you are into a situation where interstitial condensation becomes a real risk of forming in an unventilated cavity, leading to fungal and mould growth ... thus leading to the well know health problems....
 
There is vey little difference in the insulation value between the two. However if you have the extra money go with the 75mm. I think the reason why your designer has put forward the 65mm is based on the fact that as your rooms are already small why make them smaller.
 

[broken link removed]

page 4 of the certification.

for me its a solid wall (about 9" including render) so the thicker the better
 
Phester
Xtratherm is cheaper than Kingspan and gives comparable U values.

Simeon -we nailed battons on the wall then insulation boards (sealed the joints with the special silver tape ...very important). This left enough space for air and wires/pipes for services, then nailed plasterboard. If you do it remember to put grounds in so your curtain rails/rads have somthing to hang off.
 
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