Cold extension... insulation ideas: panel ceiling/tile floor

[Poolio90]

Our 2 storey extension (kitchen and bathroom) is a lot colder than the rest of the house. I've insulated the loft - with about 300mm of standard insulation, but it's still pretty cold.

Both the ceilings of kitchen and loft are formed from slatted wooden
panelling - both floors are tiled.

Not sure there's enough to prevent cold from passing from loft to bathroom and then bathroom to kitchen...

What would anyone suggest to cosy up the house before winter really sets in?

 

[^woody^]

Your heating is probably undersized for the rooms

 

[Poolio90]

Is there a rough guide on 'required radiator size' v 'room volume'?
JP

 

[mointainwalker]

There is but I can't remember it. If no answers, try plumbers forum or do a search on "radiator sizing" or similar.

 

[mbga9pgf]

Is there a rough guide on 'required radiator size' v 'room volume'?
JP

I have an excel spreadsheet I made for calculating the temperature of a room with time, with lots of input variables (building air changes per hour, rooms size, wall U value, window size, window U value, ceiling u value etc) its pretty basic, doesnt take account of thermal mixing (I am an aerospace engineer by trade, bit of a perfectionist!)

If you want it, let me know and I will email it you. It allows you to set the values for a room or for the building and also the effect of increasing the heat input to a room.

Otherwise, just use this:

http://www.homesupply.co.uk/radiator_output_calculator.php

 

[Poolio19]

Well according to the website the radiator is adequate...

However there are not really enough variables on there to properly specify the room type. We have an open air vent in one wall which can't help thints, I've recently bought a moisture controlled extractor fan to replace it (as we have quite a bit of condensation in the bathroom (travelling up from Kitchen) which may make a difference (i.e. one way traffic of air out, and no cold in!).

Yesterady sealed / filled lots of holes under skirtings and cupboards and that seems to have improved things a degree or two, I think the combined effect of several tiny little draughts (especially onto tiled floors) really can cool a room down quickly.

Thanks
JP

 

[mointainwalker]

/ filled lots of holes under skirtings

Check your sockets as well for leaks.

 

[Poolio90]

Bon idee!
Will get the gunk gun out again!