Slab loft insulation question

[Brian Lacey]

I would like to add a little extra insulation into the loft of our bungalow.
I can only access part of the loft space, not the whole lot due to the design of the building (later extensions to original build.)
The roof is a low chalet style., I am not tall but even at the apex of the roof line I am stooping over, space is very limited and difficult to work in. I will not be able to use rolls of insulation as I simply cannot get it in the very shallow space. I was wondering about polystyrene slabs (cut into strips so they fit through the hatch) and then pushing them over the existing insulation to reach the extremes. The fire hazard aspect is a concern though so any slab alternatives I should consider ?
Many thanks.
Brian.

 

[hllns]

Rolls aren't as bad as you think once they're unrolled, my eaves were very tight and cramped so I lifted up strips of loft roll sliding them sideways using long thin bits of timber. You typically have to work lying down doing this kind of job.

Polystyrene isn't great, if there's any electrical cable that it could touch it would degrade the cable making the insulation brittle and unsafe.

Rockwool batts might be a better choice.

 

[pcaouolte]

I spent some time at the beginning of last winter increasing my 100mm loft insulation to 370mm by laying 270mm fibreglass roll over the top of the existing. This has made absolutely no detectable difference to my heating bills.