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What timber would you use? 6x2 C24? or 8x2?

I checked my local steel supplier, a 150 x 75 x 18mm Channel weighs the same as a 150 x 100 x 5mm Rectangular Box Section (both 18kg/m) and the channel is only £13 cheaper than the RHS. Is RHS structurally better than a Channel? Product kg/m Total weight for 3800mm long Price inc. VAT 150...

Thank you for your reply. What channel size would you use?

which timber joists should be used? 6 x 2? and how many would need to be bolted together?

I'm looking to purchase a rectangular hollow section (RHS) steel beam to use as a door lintel for a garden room, similar to the one shown in this video. The door opening is 3200mm wide. What size RHS beam would be suitable to support a flat roof constructed with 6x2 joists spaced at 400mm...

I am building a 3.5 x 6.0 metre workshop. The plan is to lay 100mm (4 inches) MOT Type 1 Hardcore, a layer of sand, DPM, then a concert slap of 100mm (4 inches). I came across this video which sugguest using soil cement or cement-stabilized soil instead of the MOT Type 1 Hardcore. Has anyone...