I guess my description was poor.
If you use a pair of bags, one either side of the joint, and then
fill them both with foam, you end up with two halves that you can
hopefully lift off the joint. Maybe its easier to imagine you were
filling the bags up with foam in the same manner you would to take
a mould from the joint.

Agreed, though, a bit of clingfilm would certainly save a great deal
of pain should the foam get loose ;-)

And to work properly it would be best to contain the foam inside a
box or tube, to keep its outside neat. Maybe a lump of 110mm soil
pipe cut in half lengthways would make a nice external mould until
the foam had set.

So who is going to be the first one to try it ;-)

|-> -----Original Message-----
|-> On Behalf Of Stephen McGarry
|-> Sent: Tuesday, July 07, 2009 9:57 AM
|-> Subject: Re: UK_Selfbuild Insulating "awkward" bits of pipework
|->
|-> I think I would wrap the item in cling film first so that
|-> if (or more probably next week (murphys law)) you did need
|-> to service the joint then you should be able to cut the foam off!
|->
|-> Just my 2p worth
|-> Stephen
|->
|->
|-> WEBSTER, Edward ( known as John) wrote:
|-> >
|-> > another idea is to wrap the joints in plastic bags, and then use
|-> > expanding foam.
|-> > I'm thinking the same way equipment is often boxed for
|-> transport - put
|-> > it in a box with bags around it, squirt the foam into the
|-> bags and let
|-> > it expand to fill the gap.
|-> >
|-> > This is what I'd though of for our various joints and
|-> plate exchanger,
|-> > just not got around to doing it yet.
|-> >
|-> > Cheers,
|-> > Webbo.

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