Roof insulation looks like hays

[GoodOne]

Hiya,

My boiler roof leaks I and decides to DIY. I found that the insulation looks like a compact hay which I've never seen before. Is there any reason this insulation is made of such (as image).

 

[Tigercubrider]

A place I used to work had a roof made from what looked like wheatabix
It was compressed wood wool

 

[GoodOne]

Does it got to do with the boiler room, which needs those special made?

 

[alan333]

It's called stramit board. Widely used on roof construction in local authority housing in Cumbernauld (a new town built around 1950's - 60's), never came across it used anywhere else but I'm sure it must have been. Quite strong until it gets wet, and was intended to be a combined solid surface and insulation in one. Almost definitely no specific reason not to do away with it if you wish.

 

[GoodOne]

Is it ok to replace it with polystyrene board insulation?

 

[alan333]

Not as a like-for-like replacement since polystyrene won't be any good as roof boarding - you'll need boarding first then your selection of roof covering (including insulation as you require).