But there is in I-beam!
We were quoted £7,000 for the I-beam for the floor joists pre made. This would have been most of the £10,000 budget! By making them our selves we spent £100 on cascamite wood glue, £200 on 2x2 timber, £500 on 12mm OSB 3, and maybe £20 on nails. That’s roughly £820 + labour to make all the rafters and the floor joists. Quite a saving I think your agree! Please note that these figures are rough and based on our 30m2 build. Therefore figures should be used as a guide only.
We made a template to help us make our I-beams, work out our cut lengths required and got started. A break down of this would be as follows;
o Insert 2x2 (50x50) timber into jig, spread glue on 2x2, ready for OSB3, lay OSB3 on top in jig.
o Dove tail nails at 400mm centres (50mm nails). Make sure 2x2 joints & OSB3 joints are staggered.
o Spread glue on OSB3 ready for top 2x2 timbers
o Nail 2x2 timbers using bigger nails (75mm)
o Complete I-beam