"Toby" wrote in message
...

"Rick Hughes" wrote
Q:
why on earth use 4" of polystyrene ? .... you can use polyurethane, it
is
A:
cost

Not if you buy form Seconds & Co. ... you can buy any size, thickness and
style of foam - getting polyurethane for the price of polystyrene.

They have 2 outlets - but I think they are now unrelated.


I bought more than 60 sheets of foam, 50mm and 100mm ... saved a packet
compared to builders merchants.

Rick