cliveuk Posted August 15, 2022 Share Posted August 15, 2022 Can anyone explain the difference between the Black and oily steel and the clean shiny stuff which is widely available in 6 metre lengths and which should we be using for roof construction, some of which will be on show and painted Black. Thanks. Link to comment Share on other sites More sharing options...
Excel Posted August 15, 2022 Share Posted August 15, 2022 Do you mean the oiled black steel compared to the galvanized steel which you refer to as shiny ? Link to comment Share on other sites More sharing options...
cliveuk Posted August 15, 2022 Author Share Posted August 15, 2022 10 minutes ago, Excel said: Do you mean the oiled black steel compared to the galvanized steel which you refer to as shiny ? Yes Link to comment Share on other sites More sharing options...
Excel Posted August 15, 2022 Share Posted August 15, 2022 (edited) 5 minutes ago, cliveuk said: Yes So know you know then. The galvanised is generally in far less section sizes and on the thinner walled sections which you often see on Thai houses were the spans are minimal. Edited August 15, 2022 by Excel Link to comment Share on other sites More sharing options...
Kwasaki Posted August 15, 2022 Share Posted August 15, 2022 1 hour ago, cliveuk said: difference between the Black and oily steel and the clean shiny stuff What does your architect drawing spec nominate, depends on what you need and how much. Link to comment Share on other sites More sharing options...
cliveuk Posted August 16, 2022 Author Share Posted August 16, 2022 14 hours ago, Excel said: So know you know then. The galvanised is generally in far less section sizes and on the thinner walled sections which you often see on Thai houses were the spans are minimal. Our local stockists have plenty of both, so one is galvanised and one isn't. Thats the only difference? I want some exposed Black steelwork so am I better with the galvanised and painting it or with the Black steel and cleaning it? Any idea? Link to comment Share on other sites More sharing options...
cliveuk Posted August 16, 2022 Author Share Posted August 16, 2022 12 hours ago, Kwasaki said: What does your architect drawing spec nominate, depends on what you need and how much. No architect involved, just trying to understand the materials. Link to comment Share on other sites More sharing options...
Excel Posted August 16, 2022 Share Posted August 16, 2022 4 minutes ago, cliveuk said: Our local stockists have plenty of both, so one is galvanised and one isn't. Thats the only difference? I want some exposed Black steelwork so am I better with the galvanised and painting it or with the Black steel and cleaning it? Any idea? As you want a black finish I would go for the black steel. Of course give it a good wipe prior to a primer, then your top coat(s) 1 Link to comment Share on other sites More sharing options...
Kwasaki Posted August 16, 2022 Share Posted August 16, 2022 2 hours ago, cliveuk said: Our local stockists have plenty of both, so one is galvanised and one isn't. Thats the only difference? I want some exposed Black steelwork so am I better with the galvanised and painting it or with the Black steel and cleaning it? Any idea? Up to you steel amounts depend on costs. Welded joints on Galv section need primming and finish. Untreated steel section needs all joints and surfacing primming and finish. 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted August 16, 2022 Share Posted August 16, 2022 9 hours ago, cliveuk said: Our local stockists have plenty of both, so one is galvanised and one isn't. Thats the only difference? I want some exposed Black steelwork so am I better with the galvanised and painting it or with the Black steel and cleaning it? Any idea? All steel needs treatment. galvanised Steel needs less protection Sir Humphrey Davy discovered this it 1824. You will have to paint all your steel to provide and protect the black finish you will have fewer rust problems if you use galvanised steel. You will have to take more care when welding 1 Link to comment Share on other sites More sharing options...
Excel Posted August 16, 2022 Share Posted August 16, 2022 3 minutes ago, sometimewoodworker said: All steel needs treatment. galvanised Steel needs less protection Sir Humphrey Davy discovered this it 1824. You will have to paint all your steel to provide and protect the black finish you will have fewer rust problems if you use galvanised steel. You will have to take more care when welding When welding galvanised steel you need to ensure your welders have adequate protection as the zinc oxide fumes can be very dangerous especially in an enclosed space but quite often flu like symptoms are a sign of inhalation of the fumes. Also, and guess for simple Thai house builds, welds are not checked, but the zinc deposits can compromise the weld. Of course as I said no welds are checked in a Thai house build so no one is the wiser. We would never use pre-galvanised steel in major structures for that very reason but as I say for simplistic house builds then suspect no one cares, even if they know the hazards. 2 Link to comment Share on other sites More sharing options...
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