Sea Tin
Sea Tin
Corrugated tin roofing
The roofing material otherwise known as corrugated iron would have to have been the single material that defines the the pioneering days of many countries. Known as tin roofing or galvanised iron it helped people to settle many of the worlds remote areas in the 19th century. From the pampas of South America to the goldfields of South Africa. It was seen on saloon roofs in the US “wild west” and on cattle stations in the Australian outback.
The term “Tin Roofing” comes from the process of tin plating iron sheets which has been around since the 16th century.
Combine this with the invention of the rolling machine in the 1830′s and a unique roofing material was created.
Soon after the coating changed to zinc and so we got galvanised iron.
So we have phrases that live on in the language and that are still in common use today like Tennessee Williams’ “tin roof” and the Aussie “galvanised iron” that will be around for years to come. They are of course completely wrong when talking about modern roofing materials.
- Tin as in corrugated tin roof has not been used since before Tennessee Williams time, but we still use the word in everyday language to talk about many things that are only remotely connected to the metal Tin.
- The word iron as in corrugated iron is still used today, but in actual fact the roofing material has been steel for well over one hundred years.
- The coating of some steel products with zinc in the galvanisation process is still alive and well, but in the steel roofing field it just about redundant apart from heritage work.
- Since 1972 Galvalume ® coated steel has gradually replaced all other methods of protecting steel roofing materials.
- Galvalume ® is a 55% Al-Zn (aluminium and zinc alloy)coated sheet steel product, which goes under various trade names around the world, depending on the manufacturer.
- When the base sheeting is coated with the aluminium and zinc alloy only, that is no further coloured coatings, it does look similar to the old galvanised iron, but it does not have the spangled effect.
So what are the advantages of corrugated tin roofing or to use it’s correct modern name roll formed steel roofing.
- As I said previously corrugated tin roofing is not hot any more. The low thermal mass and the highly reflective coatings combined with modern roofing insulation materials give steel the edge over most other roofing products in the energy conservation field, which means less power consumption for cooling.
- Modern steel roofing profile provide structural stiffness along the lengths of the sheets. This means that materials like ply sheathing is not required making roof framing process cheaper.
- Steel mills are huge production factories that are few an far between, but since the invention of the roll forming process it is now possible to transport coils or the sheet material economically to small local roll forming businesses.
- Roll forming machine can produce almost any length of sheets. The only restriction is the length of the available transport.
- This means that most homes can now have corrugated tin roofing with no unnecessary joints.
- The strength to weight ratio of modern corrugated tin roofing is second to no other roofing material. I live in a house that is a few hundred meters from the sea in the highest cyclonic terrain category, my family and I have been through intense hurricane force winds (cyclone Tracy 1974) and we have no doubts that our steel roofing will protect us in the event of another “big blow”.
So, forget all about cats on hot corrugated tin roofs, and consider modern steel roofing if you want a cost effective, good looking, strong and cool roof.
About the Author
Bill Bradley is a retired builder-general contractor with 50 years experience in the home building industry.
Bill has written more about corrugated tin roofing on his own website that he has built to help home owners and the DIY
How I can get an appraisal on my canal boat (mid 1960) that was made in England. The CFM is the business
Creighton is a "Seagull." It looks like a camper but it is actually a mini houseboat that is built on a trailer, that is: the trailer is left with all the time. It 17 'overall, but the cabin is about 15'. Sleeps 4, has a closet for a port, a bathroom, a gas burner stove, a sink. a sliding sun roof open, a dining table that turns into a bed, a bunk bed that becomes a sofa … It is licensed in Indiana when I bought it as a "house-car." The title was lost so the new title. I've been published in boat # 's for the front, and a trailer plate back. I've had in the water and certainly sailor. I have the original brochure for it too! It was not made a similar ship named "Car-a-Boat", (also in England). It is made fiberglass in the bottom half, and the tin roof of wood in the upper half. It seems to be one of the few left in existence, and most defineatly the only states. I find its value for insurance and the possible sale of the same.
The easiest way to find the value of anything is to look around and see what other Similar items are selling for. In fact this is how the marine inspector will. You will be asked what you think is worthwhile, what you paid for it, and compare that value to what other ships of that type and condition are selling. You may do the same yourself. If you want a second opinion from a the condition of the vessel to a marine professional inspector is well worth the money.
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