I need to replace a right angled solder fitting that has a hole in it.
The fitting is touching the wall - just plain bricks.
Do I *have* to place some protection behind the fitting, or will the
brickwork be OK when I heat the copper (and therefore the bricks) with a
Any advice would be appreciated.
Square meals often make round people.
- E. Joseph Cossman -
If you heat direct on the bricks, the bricks will explode tiny red hot
pieces on you. Buy a cheap heat proof mat (abou two quid) and do the job
safely. An alternate would be a metal shield (not as good though)
OK - I've seen them for sale in B&Q.
Now, if I were to slide a heat proof mat behind the fitting, the fitting
would then be sitting on the mat - I have only a mm or so clearance
between the fitting and the wall.
Can I direct a flame right on to one of these mats? Will it take the
heat away from the joint?
Human beings, who are almost unique in having the ability to learn from
the experience of others, are also remarkable for their apparent
Yes, and yes, somewhat. It seems to interrupt the flow of hot gases.
However teh copper should conduct well enough that this isn;t a problem.
Bricks should be OK for a bit of a blast, but the mat will avod
Your flame should be pointing at the fitting - not the mat. And the
width of the flame should be no wider than the fitting. As such the
mat won't be taking direct heat, it will simply be gaining heat from
touching the fitting - and because it's rate of conductivity will be
low then you are okay for long enough to fix the fitting.
Odd that you've got a fitting with a hole in it though! Time to move
that dartboard I think..... ;)
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It depends on how damp they are at the time. An ordinary house brick can
hold a pint of water, although you have problems if one on an inside wall is
doing so. A damp brick heated quickly will form steam inside and the steam
can blow bits off some types of brick.
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