Calculating the amount of insulation

[Russell griffiths]

Morning 

i had another topic going about how much insulation to put on top of a bram and block floor

so it look like I need to start getting a bit more technical, 

how do I calculate how good 200mm of insulation will be compared to 300mm

and also the bearing this will have cost wise. 

Do I put in an extra 100mm at additional cost what is the payback 

 

 I’ll be getting the wife involved in this as she’s the number cruncher, I’m just good at hitting things with a hammer. 

Cheers russ. 

[bassanclan]

http://www.changeplan.co.uk/u_value_calculator.php

[Dudda]

Keep in mind the location of the insulation. If you've an attic you can easily add more to the roof later. It's difficult but you can add additional insulation to walls at a later date (either internal or external and very easy if you've a cavity you can fill). Adding insulation to a floor is extremely difficult and disruptive.

[CC45]

Celotex have got a calc on their www.