I am still in pondering mode about my loft insulation.
After a bit of looking around I see that knauf do a type of insulation
that looks pretty neat. Its called space blanket
The thing that I like about that is that I could lift up the insulation in
the future for wiring etc, and it's all enclosed, so there shouldn't be so
much dust flying around.
However I have 2 questions.
1) My joist height is 4 inches (100 mm), but their product only sells in
150mm and 200mm. If I installed the 150mm and later boarded on top of it,
(effectively making 150mm into 100mm), would that simply mean that the
insulation would act as if it were 100mm, or would it be less effective as
there wouldn't be as much air to trap the cold.
2) The space _between_
my joists varies ever so slightly, it appears to be
around 400mm. All of the loft insulation that I have seen sells in 370mm
width (they must assume 400mm joist centres). Has anyone else seen this
before and got any advice on what to do?