Where can I buy loose fill fibrous insulation for a loft?

[Bluetooth]

My loft is mostly boarded. It is insulated under the boards, with what appears to be rolls of rockwool type insulation. Around some of the edges, under the cold water tank and above a dormer window the loft is not boarded, but is insulated with clumps of a dark brown fibrous material in a relatively thin and uneven layer. I want to increase the thickness of the insulation in these areas. Perhaps the most obvious way is to put more of the same material down, because it is difficult to lay rolls in these areas, but I don't know what it is called or where I could buy it. Is it loose fill, or could it be insulation rolls that have been cut or torn, or even rolls that have deteriorated and broken up?

I suppose I could use the granular type loose fill, but I think it would look better if I could use something similar to what is already down.

If anyone could help me by naming the type of insulation described or if anyone knows where I could purchase it, I'd be most grateful.

 

[freddiemercurystwin]

If you want to improve your loft insulation a little and retain the boarding in the loft you can of course add the loose fill insulation to a depth of your existing ceiling joists. Warmcel 100 is a manufacturer http://www.google.co.uk/#hl=en&cr=c...&aqi=g1&aql=&oq=&gs_rfai=&fp=8b857c6d210702e0 although I think there are other makes.

However if you want to significantly improve the insulation you will have to add new spacer joists perpendicular to your existing joists and 2 or 3 layers of Rockwool or similar and then board over it. Otherwise you could add a rigid insulation such as Kingspan between your existing joists and replace the boards afterwards.

 

[Bluetooth]

Thanks for the information. I'll try the Warmcell.