Sawatdee
Margin of errors for CAD design work, no matter what systems, mostly occurs with additions, renovations on existing buildings. Especially if the buildings was built in the traditional ways where the builders were too good they don't need leveling tools
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It can be reduced by site visit and taking exact measurements.
The design can be previewed in 3D to minimize many possible errors. We find afterwards the customers would request some modifications after 'seeing' their design functionality.
On new job, as long as the ground floor is strictly monitored, leveled and exact (it can be achieved), the light metal frame design can be just a drop on the floor. Note anchoring points are important and need to be per-designed in, or thereafter one would rely on concrete bolts every 600-700mm on the base plates and more anchors on columns. The building code does not yet prescribed cyclonic tie downs, please allow N2=w33 33kms/hr wind + terrain affects.
Lots of attention is needed for anchoring and fixing, note of in shear screwing ie. not pull off screws that relies on only a few teeth grip.; for all interconnections and especially roof trusses.
It's all part of selecting the right supplier
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and inspector.
The light metal is fully certified metal eg. G550 unlike some 'black metal' 60% sub standard, and lots QC over joints and welding. Rust proofing also, not just red paint
Light metal frame is a viable alternative to building design, it can only be driven by better appreciation of the technology and its benefits: time, termite proof, rust proofed, straight, fire safe, electrical safe, higher standards etc.
Improved air circulation and ventilation in wall cavities through the roof ie. cooler homes, no damp marks on walls, no ugly electrical running everywhere (cable hidden in wall cavities). Unlike most foreigners, people complaint about gypsum board walls, but it can be made more solid with plaster boards over 6mm boards eg. Viva boards. or double 10mm gypsum boards.
Save $ if you can do some of the work yourself since the house is already engineered ready just for assembling and sub contracting. Easier to manage the finance in small sums per sub contracts.
Per linear price, design, prep, manufactured, construction time, logistics; it is cheaper that 'black metal' design and not far from concrete built (high same standards applies).
Termite problems can be minimized with ant caps, do it yourself: thin metal plates cover on stumps, running a plate along brick works (there are anti termites chemical impregnated sheets), green way : dig in compost in garden bed around the house, red ants nets (they fight, easier to control than termites), sand filled sub floor, 'sacrifice feed eg. corn cobs bed to attract away termites from house.
PM for more discussion
kumphawapi wrote:This thin steel construction has much less room for error than other methods.
But there are some good sources on the Internet give detailed guides to rolled steel frame construction and design.
http://www.steelframing.org/PDF/SFA_Fra ... al%202.pdf
Other guides give very detailed instructions on where every length should be and every joint should be made.