[Polystyrene insulation]

Thank you for your replies,

I feel reassured once more. 

[Polystyrene insulation]

8 minutes ago, dmr said:

If the polystyrene has been well fitted then there will not be a problem. I suspect its easier to do a bad job with polystyrene than it is with sprayfoam so I suppose sprayfoam is a safer bet, but we do hear about bad sprayfoam jobs with small areas of exposed metal.

Sprayfoam is better but its not as clear cut as this forum makes out, the forum does tend to be a bit black and white at times.

Pumpout bogs are great, Morso Squirrels are not the only good stove, and engine rooms are not a waste of space.

................Dave 

Hi dmr

Thanks for the reply. 

Your comment about the Morso Squirrel is interesting, as our survey showed that it was cracked & needs replacing. 

If you were to have a new one installed, what would be your preference?

PS: Sorry if my question is misplaced & off topic (I can re-post in the appropriate section if required) 

 

[Polystyrene insulation]

As a complete newby to this group I feel somewhat humbled by the expertise demonstrated in the replies. 

We are currently in the process of buying our first narrowboat & one of my concerns is that she is insulated with either polyurethane or polystyrene sheets. This is a 2005 Aqualine vessel which seems fairly well thought of. 

The type of insulation is one of my greatest worries, as I would imagine that the air gap between the polystyrene sheets & the cold steel wall of the hull, would be a likely cause of condensation on the cold surface. Clearly those vessels with a spray foam insulation, will not be susceptible to the same concern, as the air gap should (in theory at least) be non existent.