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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Lead burning/tack welding torch - boiler flue through lead roof
Hi
At some point I'll need to take a concentric room sealed boiler flue (and maybe a soil stack vent) out through a flat lead roof. To this end, I've decided to, for a 100mm exit: 1) Cut a 70mm hole in the lead; 2) Cut a 150mm hole in the wood (combustable material clearance gap of 25mm all round) 3) Work the edge of the lead round the hole up to form a circular lip about 1-2cm high, and enlarging the hole to about 110mm - I've cold worked lead before, so with some adjustments, I'm sure this is possible 4) Make a slightly conical lead tube about 100mm long, 120-130mm at the base at 100mm at the top. 5) Sit tube over lip round hole in roof and put stainless steel flue pipe through. 6) Use flue manufacturer's rubber vertical seal collar to seal between flue and lead tube. ---- This seems to be a reasonable way to get an instrinsically rainproof seal. Unless anyone can suggest a better method? So, the actual question is: Would one of these: http://www.transtools.co.uk/store/pr...torch-set.html be meaty enough for seam welding lead (for the tube) and either seam or tack welding the tube onto the roof (that joint is naturally rainproof and I don't want to wibble around too long burning holes in my perfectly good roof - so tack welding might be safer - and perfectly sufficient. I'd also considered soft soldering, but I reckon I'd need a rather lage blowtorch to get the roof hot enough (and burning the wood), whereas with lead burning, I'm hoping it works like welding, where a mentally hot small flame does the work in a very localised fashion. Of course, I'll practise first - but any pointers would be appreciated Cheers Tim |
#2
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Lead burning/tack welding torch - boiler flue through lead roof
"Tim S" wrote in message ... Hi At some point I'll need to take a concentric room sealed boiler flue (and maybe a soil stack vent) out through a flat lead roof. To this end, I've decided to, for a 100mm exit: 1) Cut a 70mm hole in the lead; 2) Cut a 150mm hole in the wood (combustable material clearance gap of 25mm all round) 3) Work the edge of the lead round the hole up to form a circular lip about 1-2cm high, and enlarging the hole to about 110mm - I've cold worked lead before, so with some adjustments, I'm sure this is possible 4) Make a slightly conical lead tube about 100mm long, 120-130mm at the base at 100mm at the top. 5) Sit tube over lip round hole in roof and put stainless steel flue pipe through. 6) Use flue manufacturer's rubber vertical seal collar to seal between flue and lead tube. ---- Isn't this what you're after? http://www.bhl.co.uk/product.php?productid=48449 mark |
#3
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Lead burning/tack welding torch - boiler flue through lead roof
mark coughed up some electrons that declared:
Isn't this what you're after? http://www.bhl.co.uk/product.php?productid=48449 mark Perhaps - although I could use a 5 degree (or zero degree) version; the roof has very little pitch. However, this looks interesting: http://www.bhl.co.uk/product/FLEXISL...MM_UNCUT_2040D Still need to bond it to the roof. I'll give them a ring and see what they say. Thanks for that pointer. Cheers Tim |
#4
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Lead burning/tack welding torch - boiler flue through lead roof
In message , Tim S
writes Hi At some point I'll need to take a concentric room sealed boiler flue (and maybe a soil stack vent) out through a flat lead roof. Would one of these: http://www.transtools.co.uk/store/pr.../gas-torches/r othenberger-micro-fire-lead-gas-torch-set.html I would have thought not - you need to get a lot of heat in very quickly I've prolly got one that will do what you need I have a friend who is a lead roofer who will be able to tell us exactly -- geoff |
#5
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Lead burning/tack welding torch - boiler flue through lead roof
geoff coughed up some electrons that declared:
I would have thought not - you need to get a lot of heat in very quickly OK I've prolly got one that will do what you need I have a friend who is a lead roofer who will be able to tell us exactly Look forward to it - ta. I expect "others" might bond a lead slate on with some rubber scunge - but welding seems better. Cheers Tim |
#6
Posted to uk.d-i-y
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Lead burning/tack welding torch - boiler flue through lead roof
In message , Tim S
writes geoff coughed up some electrons that declared: I would have thought not - you need to get a lot of heat in very quickly OK I've prolly got one that will do what you need I have a friend who is a lead roofer who will be able to tell us exactly Look forward to it - ta. I expect "others" might bond a lead slate on with some rubber scunge - but welding seems better. I have one of these (with a mapp gas cylinder on) http://www.transtools.co.uk/store/pr...gas-torches/ro thenberger-quick-fire-gas-torch-piezo.html or I have a hand held torch which attached to a gas cylinder (what the big boys use) -- geoff |
#7
Posted to uk.d-i-y
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Lead burning/tack welding torch - boiler flue through lead roof
Tim S wrote:
So, the actual question is: Would one of these: http://www.transtools.co.uk/store/pr...torch-set.html be meaty enough for seam welding lead (for the tube) and either seam or tack welding the tube onto the roof (that joint is naturally rainproof and I don't want to wibble around too long burning holes in my perfectly good roof - so tack welding might be safer - and perfectly sufficient. Looks like the sort of thing used he http://www.youtube.com/watch?v=7DbamTXhA7c -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#8
Posted to uk.d-i-y
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Lead burning/tack welding torch - boiler flue through lead roof
Tim S wrote:
mark coughed up some electrons that declared: Isn't this what you're after? http://www.bhl.co.uk/product.php?productid=48449 mark Perhaps - although I could use a 5 degree (or zero degree) version; the roof has very little pitch. I expect that is what this one is, although they have the wrong photo: http://www.bhl.co.uk/product/4_STRAIGHT_LEAD_SLATE_ (they use the same photo for all the variations you will notice) http://www.bhl.co.uk/home.php?cat=6567 -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#9
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Lead burning/tack welding torch - boiler flue through lead roof
In article ,
Tim S wrote: I'd also considered soft soldering, but I reckon I'd need a rather lage blowtorch to get the roof hot enough (and burning the wood), whereas with lead burning, I'm hoping it works like welding, where a mentally hot small flame does the work in a very localised fashion. I had a small split on one corner of a lead cover over some pipe ducting which was easily accessible (being on a roof terrace) so decided to have a go and got good results using ordinary elctronics leaded multicore and a small 'jewellers' butane blowlamp. I practised on some scrap first. Lead isn't that good a conductor of heat. But you'd need a still day for this to work easily. -- *Time is fun when you're having flies... Kermit Dave Plowman London SW To e-mail, change noise into sound. |
#10
Posted to uk.d-i-y
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Lead burning/tack welding torch - boiler flue through lead roof
Dave Plowman (News) coughed up some electrons that declared:
In article , Tim S wrote: I'd also considered soft soldering, but I reckon I'd need a rather lage blowtorch to get the roof hot enough (and burning the wood), whereas with lead burning, I'm hoping it works like welding, where a mentally hot small flame does the work in a very localised fashion. I had a small split on one corner of a lead cover over some pipe ducting which was easily accessible (being on a roof terrace) so decided to have a go and got good results using ordinary elctronics leaded multicore and a small 'jewellers' butane blowlamp. I practised on some scrap first. Lead isn't that good a conductor of heat. But you'd need a still day for this to work easily. Hi Dave That's interesting... That would mean that soft soldering (aka the way lead pipes were joined) would also work. For this application, I think a few tacks of soft solder would be more than sufficient. Now I'm going to walk to the plumber's merchant and ask for a stick of plumber's metal, tallow and a moleskin just to see their reaction ;- No, perhaps not, I'll look on t'internet as usual... But you did give me an idea - soldering would be safer than lead burning (less chance of unwanted holes in the roof). Cheers Tim |
#11
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Lead burning/tack welding torch - boiler flue through lead roof
Tim S wrote:
Now I'm going to walk to the plumber's merchant and ask for a stick of plumber's metal, tallow and a moleskin just to see their reaction ;- As this is uk.d-i-y ... .... you have to catch your own mole. ;-) |
#12
Posted to uk.d-i-y
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Lead burning/tack welding torch - boiler flue through lead roof
In article ,
Tim S wrote: I had a small split on one corner of a lead cover over some pipe ducting which was easily accessible (being on a roof terrace) so decided to have a go and got good results using ordinary elctronics leaded multicore and a small 'jewellers' butane blowlamp. I practised on some scrap first. Lead isn't that good a conductor of heat. But you'd need a still day for this to work easily. Hi Dave That's interesting... That would mean that soft soldering (aka the way lead pipes were joined) would also work. For this application, I think a few tacks of soft solder would be more than sufficient. Now I'm going to walk to the plumber's merchant and ask for a stick of plumber's metal, tallow and a moleskin just to see their reaction ;- My local TP stocks all of these. But you don't need tallow or moleskin for the sort of thing you're doing. They're needed to wipe a neat finish on a joint. -- Dave Plowman London SW To e-mail, change noise into sound. |
#13
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Lead burning/tack welding torch - boiler flue through lead roof
On Fri, 20 Mar 2009 09:29:23 +0000, Tim S wrote:
Dave Plowman (News) coughed up some electrons that declared: In article , Tim S wrote: I'd also considered soft soldering, but I reckon I'd need a rather lage blowtorch to get the roof hot enough (and burning the wood), whereas with lead burning, I'm hoping it works like welding, where a mentally hot small flame does the work in a very localised fashion. I had a small split on one corner of a lead cover over some pipe ducting which was easily accessible (being on a roof terrace) so decided to have a go and got good results using ordinary elctronics leaded multicore and a small 'jewellers' butane blowlamp. I practised on some scrap first. Lead isn't that good a conductor of heat. But you'd need a still day for this to work easily. Hi Dave That's interesting... That would mean that soft soldering (aka the way lead pipes were joined) would also work. For this application, I think a few tacks of soft solder would be more than sufficient. Now I'm going to walk to the plumber's merchant and ask for a stick of plumber's metal, tallow and a moleskin just to see their reaction ;- I used to do plumbed joints on lead sheathed cable when I first started work (1960s) . Used a very large (2lb) copper hatchet style soldering iron heated with a paraffin blowtorch. It's quite unwieldy until you get the knack but easily handles jobs like that. Only ever did a couple as we went over to joint boxes after that thankfully. No, perhaps not, I'll look on t'internet as usual... But you did give me an idea - soldering would be safer than lead burning (less chance of unwanted holes in the roof). Indeed it would. I used to have a gas blowtorch with a soldering bit attachment that would be ideal for joining sheet lead. Had a look on the internet but there doesn't seem to be anything like it now. Cheers Tim |
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