like you, i am about to insulate my steel trawler
the question is whether to cut pieces to fit or spray. there are pros and cons to each method.
cut to fit - this takes a long time and the pieces must be cut accurately to fit well. if i do it this way then i intend to glue some spacers to the hull
so that the insulation
sits off the hull
will then run down to the horizontal stringers and pass through the limber holes i have drilled ultimately ending up in the bilge
where it will be pumped out. doing it this way means that i can easily inspect the hull in the future by lifting out the insulation
which can then be replaced. i intend to lay further insulation over the vertical steel
spray - very quick, but if i want to inspect the hull in 5 years time how can i do it without scraping the stuff all away. and then how to replace? and if any condensation
does occur, how does it escape? i have read stories and seen pictures of rusty hulls behind spray foam.
it has taken me a lot of effort and time to spot blast the interior
hull (2hp compressor
, potblaster with 2mm nozzle and garnet abrasive) and i am about to paint
with amerseal and amercoat epoxy
system which should be good for a good few years. i don't want to make the wrong decision now about insulation.
while the spray option is attractive because it is quick, i fear that i may be risking problems down the road.
the fact that superyachts use spray foam is not convincing...boats these days are consumer products built to sell, and do the manufacturers really care about the consequences of spray foam in 15 years?
i would love to convince myself that spray is the way to go, it would save me a lot of time and effort. but my instinct is telling me that cutting and fitting is better.
i am curious about delfin's use of cork and fibreglass, what is the theory here?