Originally posted at HOWICK.com
Those businesses that have already made the shift to steel framing using offsite and modular construction techniques may have stolen a bit of an advantage and are already realising the difference it can make.
But all is not lost! You may be surprised at how easy it can be to transition to modular offsite construction and light gauge steel (LGS) for framing. For those that make the effort, the benefits are numerous. At the basic level you will find you can start to deliver projects faster, which will help keep customers happy, potentially secure performance bonuses and help you gain more projects.
With efficiency improvements, you will see far less wastage so your costs will be lower. Thanks to improved accuracy, your team will experience minimal re-work requirements or call backs, which adds to project profitability. And with LGS weighing in at less than a third of the timber used for framing, you may find your team are grateful for the change too.
Steel vs Timber: 10 reasons why you should be building with steel.
The benefits of steel construction are significant. To get things rolling along, we have put together this comparison so people in the business can make a judgement call on how light steel construction weighs up against timber framing from a builder’s perspective. Note – You can also find a printable leaflet with all of this information here.
1. Steel construction: The fastest, most efficient option
Light steel framing is manufactured using “computer numerical control” (CNC) steel roll forming machines that deliver pinpoint precision. This means that all framing components are dimensionally accurate. The result is minimum rework. With more accurate construction methods, you get faster build times.
You will also discover other efficiencies. Offsite panelized framing enables pre-assembled steel packages to be delivered and lifted straight from the truck in sequence. That means greater build efficiency on site too.
Acerum complete school construction project in less than 3 months.
Examples of the speed of construction with modular, offsite and light steel framing abound. Click here to see how Acerum where able to build 8 classrooms, 2 laboratories, a cafeteria, offices and bathrooms for Colegio Santa Lousa in less than three months. You can also read about how offsite light steel construction has delivered fast to help the fight against Covid-19 in the UK and US here.
2. Steel wastage is up to 10x less than timber
Typical timber wastage is about 20% in the US, based on one study. With light gauge steel, wastage is just 2% – a huge ten-fold reduction, which adds up to considerable cost savings. SCI Studies proved that waste reductions of up to 70% are possible with off-site light steel modular construction.
With less wastage and more efficiency throughout the process, pricing can be sharper, so construction businesses can pass that benefit on to customers as reduced costs or increase their margins as they see fit.
3. Steel: The environmental benefits of being 100% recyclable
It is not just reduced wastage that is important, it is the environmental impact of what happens to waste. Unlike treated timber for framing, steel is 100% recyclable.
When it comes to factory production, all steel off-cuts are recycled. Steel can be used time and time again, without losing any of its structural integrity or performance properties. Globally the steel industry reports a 66% recycling rate. Even with demolition jobs, 85% of steel is recycled.
Finally, because light gauge steel weighs less than timber, transportation is easier, more efficient and lower cost too.
4. Light gauge steel is the lightweight high strength alternative to timber
Interpod move modular light steel bathrooms into place in Australia.
Timber used in framing construction weighs in at three times more than its thin-guage, high-tensile steel equivalent. Because it is lighter, it is safer and easier to move around on site, and transportation costs less. And of course, with steel, lighter weight does not come at the expense of strength. In fact, cold formed steel offers the highest strength to weight ratio of any framing material. Self-drilling screws and glue are used instead of nails for skirtings, architraves and fixtures. There is no shrinkage and no more popping nails means stronger, more durable connections.
All up, steel framing provides a lighter structure with stronger connections, which means great earthquake and wind load strength that meets even the toughest seismic rating requirements.
5. Price benefits of steel over timber
Timber and steel in general terms are similarly priced, and while there are many factors to material pricing (volume discounts and design requirements among them), framing cost differentials on a like-by-like basis are in all probability similar.
There is no impact on the cost of building consents either, since consent processes are determined by the cost of the build, not the materials used.
However, there are many pricing advantages to steel over timber that may help secure more profitable projects:
- Steel framing is significantly faster to construct, so resource costs for labour are reduced
- The improved accuracy of light-gauge steel framing manufacture means less re-work, less call-backs and less wastage, all impacting final costs
- Over the longer term, steel framing remains straight and true. This means less issues with cracking to plaster linings and other fixtures and fittings over time, so the cost of ownership is reduced.
6. Steel is surprisingly easy to work with
Many people tied in to traditional construction believe it is easy to work with wood and finding trained builders and hammer hands is easy.
However, this is simply an industry myth. Many builders who have worked with timber all their lives find it surprisingly easy to switch to steel framing. What is more, it is now an integral part of every good carpenter’s training.
7. Steel framed houses look just like timber framed houses, yet they are more durable
Low-rise light steel framed homes in Hawaii, USA
There are no restrictions on the type of cladding that can be used with steel framing and the finished houses look exactly like their timber alternatives.
Indeed, even when architects design in timber, because most steel frames are made to the same dimensions as their timber alternatives, steel can be used instead.
Steel also offers better long term durability on a number of levels, not least of which is lower condensation.
8. Steel offers improved condensation performance over timber, increasing durability
Because steel has high degree of thermal conductivity, thermal bridging is used in construction. This allows steel framing inside the thermal bridging to remain above the temperature that condensation forms in the wall cavity. This protects studs and wall linings.
With timber studs however, condensation is attracted during winter months increasing the moisture content in the building irrespective of the cladding used. This damages the linings and compromises the longer term durability of timber framing.
Timber has a residual water content of 10-18%, so over time there are issues with mold and wood rot, even with treated timber. Unlike timber, however, steel does not absorb water, so it cannot promote mold, making for healthier homes in the long run.
It also means zero issues with the dimensional changes so common with timber framing. Light gauge steel framing stays straight and true, irrespective of age.