This question is for the pros that build and insulate buildings.
Its been bugging me for some time and i would simply like to get the facts without digging and unearthing all the specs.
I was told by a pro at the HD pro desk that one merit to using ROXUL the green batt insulation stuff over the pink fibreglass insulating stuff is that if you compress the green stuff you still get the same R value whereas if you compress the pink stuff it gets reduced.
The logic of the whole thing has me baffled given my thought was the insulating material achieved its insulating properties through the use of the "air gaps" that would exist between the strands/layers of the two types of material. So compress either and to me you loose that property.
BUt hey who am i to know. To be fair to the guy he was saying if you have say a corner covered by a stud or cut it incorrectly and need to fill the edge and push the green stuff in (ROXUL) you would not be affecting the R value. Whereas this is not the case with the pink stuff and by this i dont mean the solid pink foam sheets i mean the pink batts that goe between studd bays.
Anyone know the truth?