An excellent place to get sheets of insulation is from old commercial chicken houses like the tyson or purdue houses that have been removed from service or being torn down. They use 4x8 sheets atleast 1 inch thick on the roofs...just a cheap thought if you have a number of hives... On Oct 28, 2010 4:42 PM, "Juanse Barros" <[log in to unmask]> wrote: Most of the heat is lost by the top, not by the sides. I understand it is better to leave space on the sides for the bees to form a better cluster. Insulation on the top. Something to read about heat in the winter cluster http://www.culturaapicola.com.ar/apuntes/reproduccion/11_reproduccion_endotermia_invierno.pdf < http://www.culturaapicola.com.ar/apuntes/reproduccion/11_reproduccion_endotermia_invierno.pdf >-- Juanse Barros J. APIZUR S.A. Carrera 695 Gorbea - CHILE +56-45-271693 08-3613310 http://apiaraucania.blogspot.com/ [log in to unmask] *********************************************** The BEE-L mailing list is powered by L... *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm